Black Box Switch gigabit l3 managed switch with 10g uplinks, 24 port or 48 port User Manual
LGB6026A  
LGB6050A  
LGB6001C  
LGB6000SC-001  
LGB6000SC-004  
Gigabit L3 Managed Switch with 10G Uplinks, 24-Port or 48-Port  
This smart, stackable switch offers 10-Gbps uplinks  
plus full SNMP and Web management.  
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)  
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746  
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018  
Web site: www.blackbox.com • E-mail: info@blackbox.com  
Customer  
Support  
Information  
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LGB6026A GIGABIT ETHERNET SWITCH:  
Layer 3 Stackable Gigabit Ethernet Switch  
with 20 10/100/1000BASE-T (RJ-45) Ports,  
4 Gigabit Combination Ports (RJ-45/SFP),  
2 10-Gigabit Extender Module Slots,  
and 2 Stacking Ports  
LGB6050A GIGABIT ETHERNET SWITCH  
Layer 3 Stackable Gigabit Ethernet Switch  
with 44 10/100/1000BASE-T (RJ-45) Ports,  
4 Gigabit Combination Ports (RJ-45/SFP),  
2 10-Gigabit Extender Module Slots,  
and 2 Stacking Ports  
LGB6001C  
LGB6000SC-001  
1-ft. (0.3-m) Stacking Cable  
LGB6000SC-004  
10G Uplink Module  
4-ft. (1.2-m) Stacking Cable  
We‘re here to help! If you have any questions about your application  
or our products, contact Black Box Tech Support at 724-746-5500  
or go to blackbox.com and click on “Talk to Black Box.”  
You’ll be live with one of our technical experts in less than 30 seconds.  
724-746-5500 | blackbox.com  
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INSTALLATION GUIDE  
LGB6026A GIGABIT ETHERNET SWITCH  
Layer 3 Stackable Gigabit Ethernet Switch  
with 20 10/100/1000BASE-T (RJ-45) Ports,  
4 Gigabit Combination Ports (RJ-45/SFP),  
2 10-Gigabit Extender Module Slots,  
and 2 Stacking Ports  
LGB6050A GIGABIT ETHERNET SWITCH  
Layer 3 Stackable Gigabit Ethernet Switch  
with 44 10/100/1000BASE-T (RJ-45) Ports,  
4 Gigabit Combination Ports (RJ-45/SFP),  
2 10-Gigabit Extender Module Slots,  
and 2 Stacking Ports  
LGB6026A  
LGB6050A  
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COMPLIANCES AND SAFETY  
STATEMENTS  
FCC - CLASS A  
This equipment has been tested and found to comply with the limits for a Class A  
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to  
provide reasonable protection against harmful interference when the equipment  
is operated in a commercial environment. This equipment generates, uses, and  
can radiate radio frequency energy and, if not installed and used in accordance  
with the instruction manual, may cause harmful interference to radio  
communications. Operation of this equipment in a residential area is likely to  
cause harmful interference in which case the user will be required to correct the  
interference at his own expense.  
You are cautioned that changes or modifications not expressly approved by the  
party responsible for compliance could void your authority to operate the  
equipment.  
You may use unshielded twisted-pair (UTP) for RJ-45 connections - Category 3  
or better for 10 Mbps connections, Category 5 or better for 100 Mbps  
connections, Category 5, 5e, or 6 for 1000 Mbps connections. For fiber optic  
connections, you may use 50/125 or 62.5/125 micron multimode fiber or 9/125  
micron single-mode fiber.  
INDUSTRY CANADA - CLASS A  
This digital apparatus does not exceed the Class A limits for radio noise  
emissions from digital apparatus as set out in the interference-causing  
equipment standard entitled “Digital Apparatus,” ICES-003 of the Departmentof  
Communications.  
Cet appareil numérique respecte les limites de bruits radioélectriquesapplicables  
aux appareils numériques de Classe A prescrites dans la norme sur le matériel  
brouilleur: “Appareils Numériques,” NMB-003 édictée par le ministère des  
Communications.  
JAPAN VCCI CLASS A  
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COMPLIANCES AND SAFETY STATEMENTS  
CE MARK DECLARATION OF CONFORMANCE FOR EMI AND SAFETY (EEC)  
This information technology equipment complies with the requirements of the  
Council Directive 89/336/EEC on the Approximation of the laws of the Member  
States relating to Electromagnetic Compatibility and 73/23/EEC for electrical  
equipment used within certain voltage limits and the Amendment Directive 93/  
68/EEC. For the evaluation of the compliance with these Directives, the following  
standards were applied:  
RFI Emission:  
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Limit class A according to EN 55022  
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Limit class A for harmonic current emission according to EN 61000-3-  
2
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Limitation of voltage fluctuation and flicker in low-voltage supply  
system according to EN 61000-3-3  
Immunity:  
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Product family standard according to EN 55024  
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Electrostatic Discharge according to EN 61000-4-2  
Radio-frequency electromagnetic field according to EN 61000-4-3  
Electrical fast transient/burst according to EN 61000-4-4  
Surge immunity test according to EN 61000-4-5  
Immunity to conducted disturbances, Induced by radio-frequency  
fields: EN 61000-4-6  
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Power frequency magnetic field immunity test according to EN 61000-  
4-8  
Voltage dips, short interruptions and voltage variations immunity test  
according to EN 61000-4-11  
LVD:  
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EN 60950-1:2001  
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COMPLIANCES AND SAFETY STATEMENTS  
SAFETY COMPLIANCE  
Warning: Fiber Optic Port Safety  
When using a fiber optic port, never look at the transmit laser while it  
is powered on. Also, never look directly at the fiber TX port and fiber  
cable ends when they are powered on.  
CLASS I  
LASER DEVICE  
Avertissment: Ports pour fibres optiques - sécurité sur le plan optique  
Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez  
jamais directement le port TX (Transmission) à fibres optiques et les  
embouts de câbles à fibres optiques tant qu'ils sont sous tension.  
DISPOSITIF LASER  
DE CLASSE I  
Warnhinweis: Faseroptikanschlüsse - Optische Sicherheit  
Niemals ein Übertragungslaser betrachten, während dieses  
eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß und auf  
die Faserkabelenden schauen, während diese eingeschaltet sind.  
LASERGERÄT  
DER KLASSE  
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)2ꢃꢏ$3+ꢊꢒ51ꢉ! ꢋꢌꢍꢜ'2ꢃꢝꢁꢐ"  
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COMPLIANCES AND SAFETY STATEMENTS  
POWER CORD SAFETY  
Please read the following safety information carefully before installing  
the switch:  
WARNING: Installation and removal of the unit must be carried out by qualified  
personnel only.  
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The unit must be connected to an earthed (grounded) outlet to comply with  
international safety standards.  
Do not connect the unit to an A.C. outlet (power supply) without an earth  
(ground) connection.  
The appliance coupler (the connector to the unit and not the wall plug) must  
have a configuration for mating with an EN 60320/IEC 320 appliance inlet.  
The socket outlet must be near to the unit and easily accessible. You can  
only remove power from the unit by disconnecting the power cord from the  
outlet.  
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This unit operates under SELV (Safety Extra Low Voltage) conditions  
according to IEC 60950. The conditions are only maintained if the  
equipment to which it is connected also operates under SELV conditions.  
France and Peru only  
This unit cannot be powered from IT† supplies. If your supplies are of IT  
type, this unit must be powered by 230 V (2P+T) via an isolation transformer  
ratio  
1:1, with the secondary connection point labelled Neutral, connected directly to  
earth (ground).  
†
Impédance à la terre  
IMPORTANT! Before making connections, make sure you have the correct cord  
set. Check it (read the label on the cable) against the following:  
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COMPLIANCES AND SAFETY STATEMENTS  
Power Cord Set  
U.S.A. and Canada  
The cord set must be UL-approved and CSA certified.  
The minimum specifications for the flexible cord are:  
- No. 18 AWG - not longer than 2 meters, or 16 AWG.  
- Type SV or SJ  
- 3-conductor  
The cord set must have a rated current capacity of at least 10 A  
The attachment plug must be an earth-grounding type with NEMA  
5-15P (15 A, 125 V) configuration.  
Denmark  
The supply plug must comply with Section 107-2-D1, Standard  
DK2-1a or DK2-5a.  
Switzerland  
U.K.  
The supply plug must comply with SEV/ASE 1011.  
The supply plug must complywith BS1363 (3-pin 13 A) and be fitted  
with a 5 A fuse which complies with BS1362.  
The mainscord must be <HAR> or <BASEC> marked and be of type  
HO3VVF3GO.75 (minimum).  
Europe  
The supply plug must comply with CEE7/7 (“SCHUKO”).  
The mainscord must be <HAR> or <BASEC> marked and be of type  
HO3VVF3GO.75 (minimum).  
IEC-320 receptacle.  
Veuillez lire à fond l'information de la sécurité suivante avant d'installer  
le Switch:  
AVERTISSEMENT: L’installation et la dépose de ce groupe doivent être confiés à  
un personnel qualifié.  
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Ne branchez pas votre appareil sur une prise secteur (alimentation  
électrique) lorsqu'il n'y a pas de connexion de mise à la terre (mise à la  
masse).  
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Vous devez raccorder ce groupe à une sortie mise à la terre (mise à la  
masse) afin de respecter les normes internationales de sécurité.  
Le coupleur d’appareil (le connecteur du groupe et non pas la prise murale)  
doit respecter une configuration qui permet un branchement sur une entrée  
d’appareil EN 60320/IEC 320.  
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COMPLIANCES AND SAFETY STATEMENTS  
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La prise secteur doit se trouver à proximité de l’appareil et son accès doit  
être facile. Vous ne pouvez mettre l’appareil hors circuit qu’en débranchant  
son cordon électrique au niveau de cette prise.  
L’appareil fonctionne à une tension extrêmement basse de sécurité qui est  
conforme à la norme IEC 60950. Ces conditions ne sont maintenues que si  
l’équipement auquel il est raccordé fonctionne dans les mêmes conditions.  
France et Pérou uniquement:  
Ce groupe ne peut pas être alimenté par un dispositif à impédance à la terre. Si  
vos alimentations sont du type impédance à la terre, ce groupe doit être  
alimenté par une tension de 230 V (2 P+T) par le biais d’un transformateur  
d’isolement à rapport 1:1, avec un point secondaire de connexion portant  
l’appellation Neutre et avec raccordement direct à la terre (masse).  
Cordon électrique - Il doit être agréé dans le pays d’utilisation  
Etats-Unis et Canada:  
Le cordon doit avoir reçu l’homologation des UL et un certificatde  
la CSA.  
Les spécifications minimales pour un cable flexible sont AWG No.  
18, ouAWG No. 16 pour un cable de longueur inférieure  
à
2
mètres.  
- type SV ou SJ  
- 3 conducteurs  
Le cordon doit être en mesure d’acheminer un courant nominal  
d’au moins 10 A.  
La prise femelle de branchement doit être du type à mise à la  
terre (mise à la masse) et respecter la configuration NEMA 5-15P  
(15 A, 125 V).  
Danemark:  
Suisse:  
La prise mâle d’alimentationdoit respecterla section 107-2 D1 de  
la norme DK2 1a ou DK2 5a.  
La prise mâle d’alimentation doit respecter la norme SEV/ASE  
1011.  
Europe  
La prise secteur doit être conforme aux normes CEE 7/7  
(“SCHUKO”)  
LE cordon secteur doit porter la mention <HAR> ou <BASEC> et  
doit être de type HO3VVF3GO.75 (minimum).  
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COMPLIANCES AND SAFETY STATEMENTS  
Bitte unbedingt vor dem Einbauen des Switches die folgenden  
Sicherheitsanweisungen durchlesen:  
WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch  
Fachpersonal erfolgen.  
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Das Gerät sollte nicht an eine ungeerdete Wechselstromsteckdose  
angeschlossen werden.  
Das Gerät muß an eine geerdete Steckdose angeschlossen werden, welche  
die internationalen Sicherheitsnormen erfüllt.  
Der Gerätestecker (der Anschluß an das Gerät, nicht der  
Wandsteckdosenstecker) muß einen gemäß EN 60320/IEC 320  
konfigurierten Geräteeingang haben.  
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Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein.  
Die Stromversorgung des Geräts kann nur durch Herausziehen des  
Gerätenetzkabels aus der Netzsteckdose unterbrochen werden.  
Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen  
(Sicherheitskleinstspannung) gemäß IEC 60950. Diese Bedingungen sind  
nur gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter  
SELV-Bedingungen betrieben werden.  
Stromkabel. Dies muss von dem Land, in dem es benutzt wird geprüft werden:  
Schweiz  
Europe  
Dieser Stromstecker muß die SEV/ASE 1011Bestimmungen einhalten.  
Das Netzkabel muß vom Typ HO3VVF3GO.75 (Mindestanforderung)  
sein und die Aufschrift <HAR> oder <BASEC> tragen.  
Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).  
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COMPLIANCES AND SAFETY STATEMENTS  
WARNINGS AND CAUTIONARY MESSAGES  
WARNING: This product does not contain any serviceable user parts.  
WARNING: Installation and removal of the unit must be carried out by  
qualified personnel only.  
WARNING: When connecting this device to a power outlet, connect the  
field ground lead on the tri-pole power plug to a valid earth ground line  
to prevent electrical hazards  
.
WARNING: This switch uses lasers to transmit signals over fiber optic  
cable. The lasers are compliant with the requirements of a Class 1  
Laser Product and are inherently eye safe in normal operation.  
However, you should never look directly at a transmit port when it is  
powered on.  
CAUTION: Wear an anti-static wrist strap or take other suitable  
measures to prevent electrostatic discharge when handling this  
equipment.  
CAUTION: Do not plug a phone jack connector in the RJ-45 port. This  
may damage this device.  
CAUTION: Use only twisted-pair cables with RJ-45 connectors that  
conform to FCC standards.  
ENVIRONMENTAL STATEMENTS  
The manufacturer of this product endeavours to sustain an environmentally-  
friendly policy throughout the entire production process. This is achieved though  
the following means:  
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Adherence to national legislation and regulations on environmental  
production standards.  
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Conservation of operational resources.  
Waste reduction and safe disposal of all harmful un-recyclable by-products.  
Recycling of all reusable waste content.  
Design of products to maximize recyclables at the end of the product’s life  
span.  
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Continual monitoring of safety standards.  
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COMPLIANCES AND SAFETY STATEMENTS  
END OF PRODUCT LIFE SPAN  
This product is manufactured in such a way as to allow for the recovery and  
disposal of all included electrical components once the product has reached the  
end of its life.  
MANUFACTURING MATERIALS  
There are no hazardous nor ozone-depleting materials in this product.  
DOCUMENTATION  
All printed documentation for this product uses biodegradable paper that  
originates from sustained and managed forests. The inks used in the printing  
process are non-toxic.  
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COMPLIANCES AND SAFETY STATEMENTS  
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ABOUT THIS GUIDE  
PURPOSE  
This guide details the hardware features of the switch, including the physical and  
performance-related characteristics, and how to install the switch.  
AUDIENCE  
The guide is intended for use by network administrators who are responsible for  
installing and setting up network equipment; consequently, it assumes a basic  
working knowledge of LANs (Local Area Networks).  
CONVENTIONS  
The following conventions are used throughout this guide to show information:  
NOTE: Emphasizes important information or calls your attention to  
related features or instructions.  
CAUTION: Alerts you to a potential hazard that could cause loss of data,  
or damage the system or equipment.  
WARNING: Alerts you to a potential hazard that could cause personal  
injury.  
RELATED PUBLICATIONS  
The following publication gives specific information on how to operate and use  
the management functions of the switch:  
The Management Guide  
Also, as part of the switch’s software, there is an online web-based help that  
describes all management related features.  
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ABOUT THIS GUIDE  
REVISION HISTORY  
This section summarizes the changes in each revision of this guide.  
MAY 2010 REVISION  
This is the first revision of this guide.  
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CONTENTS  
COMPLIANCES AND SAFETY STATEMENTS  
5
15  
17  
19  
21  
23  
ABOUT THIS GUIDE  
CONTENTS  
TABLES  
FIGURES  
1
2
3
INTRODUCTION  
Overview  
23  
25  
30  
Description of Hardware  
Features and Benefits  
NETWORK PLANNING  
33  
Introduction to Switching  
Application Examples  
Application Notes  
33  
34  
39  
INSTALLING THE SWITCH  
41  
Selecting a Site  
41  
42  
43  
44  
47  
48  
49  
51  
52  
Ethernet Cabling  
Equipment Checklist  
Mounting  
Installing an Optional Module into the Switch  
Installing an Optional SFP Transceiver  
Connecting Switches in a Stack  
Connecting to a Power Source  
Connecting to the Console Port  
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CONTENTS  
4
MAKING NETWORK CONNECTIONS  
55  
Connecting Network Devices  
Twisted-Pair Devices  
55  
55  
58  
61  
63  
65  
Fiber Optic SFP Devices  
10 Gbps Fiber Optic Connections  
Connectivity Rules  
Cable Labeling and Connection Records  
A
TROUBLESHOOTING  
67  
Diagnosing Switch Indicators  
Power and Cooling Problems  
Installation  
67  
69  
69  
69  
70  
In-Band Access  
Stack Troubleshooting  
B
C
CABLES  
71  
Twisted-Pair Cable and Pin Assignments  
Fiber Standards  
71  
75  
SPECIFICATIONS  
77  
Physical Characteristics  
Switch Features  
77  
79  
80  
80  
81  
81  
Management Features  
Standards  
Compliances  
10GBASE Extender Module (SFP+)  
GLOSSARY  
INDEX  
83  
89  
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TABLES  
Table 1:  
Table 2:  
Table 3:  
Table 4:  
Table 5:  
Table 6:  
Table 7:  
Table 8:  
Table 9:  
Table 10:  
Table 11:  
Table 12:  
Table 13:  
Table 14:  
Table 15:  
Table 16:  
Table 17:  
Table 18:  
Table 19:  
Port Status LEDs  
26  
27  
29  
29  
52  
63  
63  
64  
64  
64  
64  
64  
65  
65  
67  
68  
72  
74  
75  
System Status LEDs  
Supported SFP+ Transceivers  
Module LEDs  
Serial Cable Wiring  
Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length  
Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length  
Maximum 1000BASE-T Gigabit Ethernet Cable Length  
Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Maximum 1000BASE-LX Gigabit Ethernet Cable Length  
Maximum 1000BASE-LH Gigabit Ethernet Cable Length  
Maximum Fast Ethernet Cable Lengths  
Maximum Ethernet Cable Length  
Troubleshooting Chart  
Power/RPS LEDs  
10/100BASE-TX MDI and MDI-X Port Pinouts  
1000BASE-T MDI and MDI-X Port Pinouts  
Fiber Standards  
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TABLES  
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FIGURES  
Figure 1:  
Figure 2:  
Figure 3:  
Figure 4:  
Figure 5:  
Figure 6:  
Figure 7:  
Figure 8:  
Figure 9:  
Figure 10:  
Figure 11:  
Figure 12:  
Figure 13:  
Figure 14:  
Figure 15:  
Figure 16:  
Figure 17:  
Figure 18:  
Figure 19:  
Figure 20:  
Figure 21:  
Figure 22:  
Figure 23:  
Figure 24:  
Figure 25:  
Figure 26:  
Figure 27:  
Front Panels  
24  
24  
26  
27  
28  
29  
34  
35  
36  
37  
38  
42  
45  
45  
46  
47  
48  
50  
51  
52  
56  
58  
59  
62  
71  
73  
73  
Rear Panel  
Port LEDs  
System LEDs  
Power Supply Sockets  
Single-Port 10GBASE Module (SFP+)  
Collapsed Backbone  
Network Aggregation Plan  
Remote Connections with Fiber Cable  
Making VLAN Connections  
IP Routing for Unicast Traffi  
RJ-45 Connections  
Attaching the Brackets  
Installing the Switch in a Rack  
Attaching the Adhesive Feet  
Installing an Optional Module  
Inserting an SFP Transceiver into a Slot  
Making Stacking Connections  
Power Socket  
Serial Port (RJ-45) Pin-Out  
Making Twisted-Pair Connections  
Network Wiring Connections  
Making Fiber Port Connections  
Connecting to an SFP+ Transceiver  
RJ-45 Connector Pin Numbers  
Straight-through Wiring  
Crossover Wiring  
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FIGURES  
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1
INTRODUCTION  
OVERVIEW  
The LGB6026A and LGB6050A Switches are intelligent multilayer switches (Layer  
2, 3) with 24/48 10/100/1000BASE-T ports, four of which are combination  
ports1 that are shared with four SFP transceiver slots (see Figure 1, Ports 21-  
24/45-48). The rear panel provides two slots for single-port 10 Gigabit Ethernet  
hot-swappable expansion modules (LGB6001C), and two stacking ports. Units  
can be stacked up to eight high through the built-in stacking ports that provide a  
48 Gbps stack backplane.  
The switches include an SNMP-based management agent embedded on the main  
board, which supports both in-band and out-of-band access for managing the  
stack.  
These switches can easily tame your network with full support for Spanning Tree  
Protocol, Multicast Switching, Virtual LANs, and IP routing. It brings order to  
poorly performing networks by segregating them into separate broadcast  
domains with IEEE 802.1Q compliant VLANs, empowers multimedia applications  
with multicast switching and CoS services, and eliminates conventional router  
bottlenecks.  
These switches can be used to augment or completely replace slow legacy  
routers, off-loading local IP traffic to release valuable resources for non-IP  
routing or WAN access. With wire-speed performance for Layer 2 and Layer 3,  
these switches can significantly improve the throughput between IP segments or  
VLANs.  
1. If an SFP transceiver is plugged in, the corresponding RJ-45 port is disabled for  
ports 21-24 on LGB6026A or ports 45-48 on LGB6050A.  
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CHAPTER 1 | Introduction  
Overview  
Figure 1: Front Panels  
Stack ID  
Port Status LEDs  
Serial Console Port  
LGB6050A  
10/100/1000 Mbps RJ-45 Ports  
System Status LEDs  
SFP Slots  
LGB6026A  
1
2
3
4
5
6
7
8
9
1
0
11  
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
Co ns ol  
e
2
1
2
2
2
3
2
4
S
ta ck ID  
M
as te r  
el ect  
S
Figure 2: Rear Panel  
Power Socket  
Redundant Power Socket  
Module Slots  
Stacking Ports  
SWITCH ARCHITECTURE  
These Gigabit Ethernet switches employ a wire-speed, non-blocking switching  
fabric. This permits simultaneous wire-speed transport of multiple packets at low  
latency on all ports. The switches also feature full-duplex capability on all ports,  
which effectively doubles the bandwidth of each connection.  
For communications between different VLANs, these switches use IP routing. For  
communications within the same VLAN, they use store-and-forward switching to  
ensure maximum data integrity. With store-and-forward switching, the entire  
packet must be received into a buffer and checked for validity before being  
forwarded. This prevents errors from being propagated throughout the network.  
These switches include built-in stacking ports that enable up to eight units to be  
connected together through a 48 Gbps stack backplane. The switch stack can be  
managed from a master unit using a single IP address.  
These switches also include two slots on the rear panel for slide-in single-port  
10GBASE modules with SFP+ transceivers.  
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CHAPTER 1 | Introduction  
Description of Hardware  
NETWORK MANAGEMENT OPTIONS  
These switches contain a comprehensive array of LEDs for “at-a-glance”  
monitoring of network and port status. They also include a management agent  
that allows you to configure or monitor the switch using its embedded  
management software, or via SNMP applications. To manage each switch, you  
can make a direct connection to the console port (out-of-band), or you can  
manage the switches through a network connection (in-band) using Telnet, the  
on-board web agent, or SNMP-based network management software.  
For a detailed description of the management features, refer to the Management  
Guide.  
DESCRIPTION OF HARDWARE  
10/100/1000BASE-T PORTS  
The switches contain 24/48 RJ-45 ports that operate at 10 Mbps or 100 Mbps,  
half or full duplex, or at 1000 Mbps, full duplex. Because all ports on these  
switches support automatic MDI/MDI-X operation, you can use straight-through  
cables for all network connections to PCs or servers, or to other switches or  
hubs. (See “1000BASE-T Pin Assignments” on page 74.)  
Each of these ports support auto-negotiation, so the optimum transmission  
mode (half or full duplex), and data rate (10, 100, or 1000 Mbps) can be  
selected automatically. If a device connected to one of these ports does not  
support auto-negotiation, the communication mode of that port can be  
configured manually.  
SFP TRANSCEIVER SLOTS  
The Small Form Factor Pluggable (SFP) transceiver slots are shared with four of  
the RJ-45 ports (ports 21–24 for the LGB6026A and ports 45–48 for the  
LGB6050A). In its default configuration, if an SFP transceiver (purchased  
separately) is installed in a slot and has a valid link on its port, the associated  
RJ-45 port is disabled and cannot be used. The switch can also be configured to  
force the use of an RJ-45 port or SFP slot, as required.  
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CHAPTER 1 | Introduction  
Description of Hardware  
10 GIGABIT ETHERNET MODULE SLOTS  
These switches include two slots on the rear panel for hot-swappable single-port  
10GBASE modules with SFP+ transceivers. Refer to “Optional Media Extender  
Modules” on page 29 for more information on this module and the supported  
10G transceivers.  
STACKING PORTS  
Each unit includes two stacking ports that provide a 48 Gbps high-speed serial  
stack backplane connection. Up to eight 24-port or 48-port switches can be  
connected together using optional stacking cables (LGB6000SC-001 or  
LGB6000SC-004). Note that the 24-port and 48-port switches can be mixed in  
the same stack. The Stack Master button enables one switch in the stack to  
be selected as the Master unit for managing the entire stack.  
PORT AND SYSTEM STATUS LEDS  
These switches include a display panel for key system and port indications that  
simplify installation and network troubleshooting. The LEDs, which are located  
on the front panel for easy viewing, are shown below and described in the  
following tables.  
Figure 3: Port LEDs  
Port Status LEDs  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
1
Table 1: Port Status LEDs  
LED  
Condition  
Status  
Link/  
Activity/Speed  
On/Flashing Amber  
On/Flashing Green  
Off  
Port has a valid link at 10 or 100 Mbps. Flashing  
indicates activity.  
Port has a valid link at 1000 Mbps. Flashing  
indicates activity.  
The link is down.  
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CHAPTER 1 | Introduction  
Description of Hardware  
Figure 4: System LEDs  
System Status LEDs  
Stack  
Master Power  
Console  
Stack  
Link  
Stack ID  
Master  
Select  
24  
RPS  
Module Diag  
Table 2: System Status LEDs  
LED  
Condition  
Green  
Status  
Power  
Internal power is operating normally.  
Internal power supply failure.  
Amber  
Off  
Power off or failure.  
Diag  
Flashing Green  
Green  
System self-diagnostic test in progress.  
System self-diagnostic test successfully  
completed.  
Amber  
System self-diagnostic test has detected a fault.  
Redundant power supply is receiving power.  
RPS  
Green  
Amber  
Fault in redundant power supply, including  
thermal or fan failure.  
Off  
Redundant power supply is off or not plugged in.  
Stack Master  
Green  
Switch is the Master unit of the stack. State may  
include topology discovery, IP assignment, or  
normal operations.  
Flashing Green  
Switch is the Master unit of the stack, system is  
initializing.  
Amber  
Switch is operating as a Slave unit in the stack.  
System in Master arbitration/election state.  
System in standalone mode.  
Flashing Amber  
Off  
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CHAPTER 1 | Introduction  
Description of Hardware  
Table 2: System Status LEDs (Continued)  
LED  
Condition  
Green  
Status  
Stack Link  
Uplink and downlink operating normally.  
Uplink has failed.  
Flashing Green  
Flashing Amber  
Off  
Downlink has failed.  
No stacking link present.  
Module  
Green  
An expansion module (LGB6001C) is installed  
and operating normally.  
Amber  
Off  
An expansion module is installed but has failed.  
There is no module installed.  
Stack ID  
1-8  
Indicates the switch stack ID.  
The Master unit is numbered 1. (Note that If the  
master unit fails and a backup unit takes over, the  
stack IDs do not change.)  
Slave units are numbered 2-8.  
Off  
In standalone mode.  
OPTIONAL REDUNDANT POWER SUPPLY  
The switch supports an optional Redundant Power Supply (RPS), that can supply  
power to the switch in the event the internal power supply fails.  
POWER SUPPLY SOCKET  
There are two power sockets on the rear panel of each switch. The standard  
power socket is for the AC power cord. The socket labeled “RPS” is for the  
optional Redundant Power Supply (RPS).  
Figure 5: Power Supply Sockets  
Redundant Power Socket  
Power Socket  
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CHAPTER 1  
|
Introduction  
Description of Hardware  
OPTIONAL MEDIA EXTENDER MODULES  
10GBASE SFP+ MODULE  
Figure 6: Single-Port 10GBASE Module (SFP+)  
The module’s SFP+ slot supports standard 10 Gigabit Ethernet (10G) SFP+  
transceivers. The 10GBASE transceivers operate at 10 Gbps full duplex with  
support for flow control.  
Table 3: Supported SFP+ Transceivers  
Media Standard Vendor  
Part Number Maximum Distance  
1GBASE-SR  
1GBASE-LR  
Black Box  
Black Box  
LSP421  
LSP422  
300 m  
10 km  
EXTENDER MODULE LEDS  
The optional 10GBASE slide-in module includes its own integrated LED indicators  
on the module’s front panel. The following table describes the LEDs.  
Table 4: Module LEDs  
LED  
Condition  
Status  
Link/Activity  
On/Flashing Green  
Port has a valid link at 10 Gbps. Flashing indicates  
activity.  
Off  
The link is down.  
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CHAPTER 1 | Introduction  
Features and Benefits  
FEATURES AND BENEFITS  
CONNECTIVITY  
ꢀꢁ 24 or 48 10/100/1000 Mbps ports for easy Gigabit Ethernet integration and  
for protection of your investment in legacy LAN equipment.  
ꢀꢁ Auto-negotiation enables each RJ-45 port to automatically select the  
optimum communication mode (half or full duplex) if this feature is  
supported by the attached device; otherwise the port can be configured  
manually.  
ꢀꢁ RJ-45 10/100/1000BASE-T ports support auto MDI/MDI-X pinout selection.  
ꢀꢁ Unshielded (UTP) cable supported on all RJ-45 ports: Category 3 or better  
for 10 Mbps connections, Category 5 or better for 100 Mbps connections,  
and Category Category 5, 5e, 6 or better for 1000 Mbps connections.  
ꢀꢁ IEEE 802.3-2005 Ethernet, Fast Ethernet, Gigabit Ethernet, and IEEE  
802.3ae 10 Gigabit Ethernet compliance ensures compatibility with  
standards-based hubs, network cards and switches from any vendor.  
ꢀꢁ Provides stacking capability via high-speed serial ports with 48 Gbps  
stacking bandwidth. Up to 8 units can be stacked together.  
EXPANDABILITY  
ꢀꢁ Supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP transceivers.  
ꢀꢁ Optional 10GBASE single-port expansion module with an SFP+  
transceiver slot (LGB6001C).  
PERFORMANCE  
ꢀꢁ Transparent bridging.  
ꢀꢁ Aggregate duplex bandwidth of up to 88 Gbps for the LGB6026A or  
136  
Gbps for the LGB6050A.  
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CHAPTER 1 | Introduction  
Features and Benefits  
ꢀꢁ Switching table with a total of 16K MAC address entries and 8K IPv4  
address entries or 4K IPv6 address entries  
ꢀꢁ Provides store-and-forward switching for intra-VLAN traffic, and IP routing  
for inter-VLAN traffic.  
ꢀ
ꢁ Supports wire-speed switching at layer 2, and wire-speed routing at layer 3.  
ꢁ Broadcast storm control.  
ꢀ
MANAGEMENT  
ꢀꢁ “At-a-glance” LEDs for easy troubleshooting  
ꢀꢁ Network management agent:  
ꢀꢁ Manages switch (or entire stack) in-band or out-of-band  
ꢀꢁ Supports console, Telnet, SSH, SNMP v1/v2c/v3, RMON (4 groups) and  
web-based interface  
ꢀꢁ Slave units provide backup stack management.  
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CHAPTER 1 | Introduction  
Features and Benefits  
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2
NETWORK PLANNING  
INTRODUCTION TO SWITCHING  
A network switch allows simultaneous transmission of multiple packets via non-  
crossbar switching. This means that it can partition a network more efficiently  
than bridges or routers. These switches have, therefore, been recognized as one  
of the most important building blocks for today’s networking technology.  
When performance bottlenecks are caused by congestion at the network access  
point (such as the network card for a high-volume file server), the device  
experiencing congestion (server, power user or hub) can be attached directly to  
a switched port. And, by using full-duplex mode, the bandwidth of the dedicated  
segment can be doubled to maximize throughput  
.
When networks are based on repeater (hub) technology, the distance between  
end stations is limited by a maximum hop count. However, a switch turns the  
hop count back to zero. So subdividing the network into smaller and more  
manageable segments, and linking them to the larger network by means of a  
switch, removes this limitation.  
A switch can be easily configured in any Ethernet, Fast Ethernet, Gigabit  
Ethernet, or 10G Ethernet network to significantly boost bandwidth while using  
conventional cabling and network cards.  
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CHAPTER 2 | Network Planning  
Application Examples  
APPLICATION EXAMPLES  
The Gigabit Ethernet Switches are not only designed to segment your network,  
but also to provide a wide range of options in setting up network connections  
and linking VLANs or IP subnets. Some typical applications are described below.  
COLLAPSED BACKBONE  
The Gigabit Ethernet Switches are an excellent choice for mixed Ethernet, Fast  
Ethernet, and Gigabit Ethernet installations where significant growth is expected  
in the near future. In a basic stand-alone configuration, it can provide direct full-  
duplex connections for up to 24/48 workstations or servers. You can easily build  
on this basic configuration, adding direct full-duplex connections to workstations  
or servers. When the time comes for further expansion, just connect to another  
hub or switch using one of the Gigabit Ethernet ports built into the front panel, a  
Gigabit Ethernet port on a plug-in SFP transceiver, or a 10G transceiver on an  
optional module.  
In the figure below, the 48-port Gigabit Ethernet Switch is operating as a  
collapsed backbone for a small LAN. It is providing dedicated 10 Mbps full-  
duplex connections to workstations and 100 Mbps full-duplex connections to  
power users, and 1 Gbps full-duplex connections to servers.  
Figure 7: Collapsed Backbone  
...  
...  
...  
Servers  
1 Gbps  
Workstations  
100 Mbps  
W
orkstations  
10 Mbps  
Full Duplex  
Full Duplex  
Full Duplex  
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CHAPTER 2 | Network Planning  
Application Examples  
NETWORK AGGREGATION PLAN  
With 24 or 48 parallel bridging ports (i.e., 24 or 48 distinct collision domains), a  
Gigabit switch stack can collapse a complex network down into a single efficient  
bridged node, increasing overall bandwidth and throughput.  
In the figure below, the 10/100/1000BASE-T ports in a stack of 48-port Gigabit  
Ethernet switches are providing 1000 Mbps connectivity through stackable  
switches. In addition, the switches are also connecting several servers at 10  
Gbps.  
Figure 8: Network Aggregation Plan  
Server Farm  
10/100/1000 Mbps Segments  
...  
...  
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CHAPTER 2 | Network Planning  
Application Examples  
REMOTE CONNECTIONS WITH FIBER CABLE  
Fiber optic technology allows for longer cabling than any other media type. A  
1000BASE-SX (MMF) link can connect to a site up to 550 meters away, a  
1000BASE-LX (SMF) link up to 5 km, and a 1000BASE-LH link up to 70 km. This  
allows a switch stack to serve as a collapsed backbone, providing direct  
connectivity for a widespread LAN.  
A 1000BASE-SX SFP transceiver can be used for a high-speed connection  
between floors in the same building and a 10GBASE-LR module can be used for  
high-bandwidth core connections between buildings in a campus setting. For  
long-haul connections, a 1000BASE-LH SFP transceiver can be used to reach  
another site up to 70 kilometers away.  
The figure below illustrates three Gigabit Ethernet switch stacks interconnecting  
multiple segments with fiber cable.  
Figure 9: Remote Connections with Fiber Cable  
Headquarters  
W
arehouse  
1000BASE-LX SMF  
(5 kilometers)  
1000BASE-SX MMF  
(500 meters)  
Server Farm  
1000BASE-LX SMF  
(5 kilometers)  
...  
Remote Switch  
Remote Switch  
Research  
&
Development  
10/100/1000 Mbps Segments  
...  
...  
...  
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CHAPTER 2 | Network Planning  
Application Examples  
MAKING VLAN CONNECTIONS  
These switches support VLANs which can be used to organize any group of  
network nodes into separate broadcast domains. VLANs confine broadcast traffic  
to the originating group, and can eliminate broadcast storms in large networks.  
This provides a more secure and cleaner network environment.  
VLANs can be based on untagged port groups, or traffic can be explicitly tagged  
to identify the VLAN group to which it belongs. Untagged VLANs can be used for  
small networks attached to a single switch. However, tagged VLANs should be  
used for larger networks, and all the VLANs assigned to the inter-switch links.  
These switches also support multiple spanning trees which allow VLAN groups to  
maintain a more stable path between all VLAN members. This can reduce the  
overall amount of protocol traffic crossing the network, and provide a shorter  
reconfiguration time if any link in the spanning tree fails.  
At Layer 3, VLANs are used to create an IP interface, where one or more ports  
are assigned to the same IP segment. Traffic is automatically routed between  
different IP segments on the same switch, without any need to configure routing  
protocols.  
Figure 10: Making VLAN Connections  
R&D  
VLAN  
1
Tagged  
Ports  
Tagge d Por  
t
Untagged Por  
ts  
VLAN  
aware  
switch  
VLAN  
una ware  
switch  
Finance  
VLAN  
Testing  
2
R&D  
Marketing  
Finance  
Testing  
VLAN  
3
VLAN  
1
VLAN  
4
VLAN  
2
VLAN  
3
NOTE: When connecting to a switch that does not support IEEE  
802.1Q VLAN tags, use untagged ports.  
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CHAPTER 2 | Network Planning  
Application Examples  
USING LAYER 3 ROUTING  
VLANs can significantly enhance network performance and security. However, if  
you use conventional routers to interconnect VLANs, you can lose most of your  
performance advantage. These Gigabit Ethernet Switches are routing switches  
that provide wire-speed routing, which allows you to eliminate your conventional  
IP routers, except for a router to handle non-IP protocols and a gateway router  
linked to the WAN. Just assign an IP address to any VLANs that need to  
communicate. The switches will continue to segregate Layer 2 traffic based on  
VLANs, but will now provide inter-VLAN connections for IP applications. The  
switches will perform IP routing for specified VLAN groups, a directly connected  
subnetwork, a remote IP subnetwork or host address, a subnetwork broadcast  
address, or an IP multicast address.  
Figure 11: IP Routing for Unicast Traffi  
R&D  
IP Network 2  
Testing  
IP Network 1  
VLAN 1  
VLAN  
2
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CHAPTER 2 | Network Planning  
Application Notes  
APPLICATION NOTES  
1. Full-duplex operation only applies to point-to-point access (such as when a  
switch is attached to a workstation, server or another switch). When the  
switch is connected to a hub, both devices must operate in half-duplex  
mode.  
2. For network applications that require routing between dissimilar network  
types, you can attach these switches directly to a multi-protocol router.  
However, if you have to interconnect distinct VLANs or IP subnets, you can  
take advantage of the wire-speed Layer 3 routing provided by these  
switches.  
3. As a general rule, the length of fiber optic cable for a single switched link  
should not exceed:  
ꢀ
ꢁ
1000BASE-SX: 550 m (1805 ft) for multimode fiber  
1000BASE-LX: 5 km (3.1 miles) for single-mode fiber  
1000BASE-LH: 70 km (43.5 miles) for single-mode fiber  
10GBASE-SR: 300 m (984 ft) for multimode fiber  
10GBASE-LR: 10 km (6.2 miles) for single-mode fiber  
10GBASE-ER: 40 km (24.8 miles) for single-mode fiber  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
However, power budget constraints must also be considered when  
calculating the maximum cable length for your specific environment.  
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CHAPTER 2 | Network Planning  
Application Notes  
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3
INSTALLING THE SWITCH  
SELECTING A SITE  
Switch units can be mounted in a standard 19-inch equipment rack or on a flat  
surface. Be sure to follow the guidelines below when choosing a location.  
ꢀꢁ  
The site should:  
ꢂꢁ  
be at the center of all the devices you want to link and near a power  
outlet.  
ꢂꢁ  
be able to maintain its temperature within 0 to 50 °C (32 to 122 °F)  
and its humidity within 5% to 95%, non-condensing  
ꢂꢁ  
provide adequate space (approximately five centimeters or two inches)  
on all sides for proper air flow  
ꢂ
ꢁ
be accessible for installing, cabling and maintaining the devices  
allow the status LEDs to be clearly visible  
ꢂꢁ  
ꢀꢁ Make sure twisted-pair cable is always routed away from power lines,  
fluorescent lighting fixtures and other sources of electrical interference,  
such as radios and transmitters.  
ꢀꢁ Make sure that the unit is connected to a separate grounded power outlet  
that provides 100 to 240 VAC, 50 to 60 Hz, is within 2 m (6.6 feet) of each  
device and is powered from an independent circuit breaker. As with any  
equipment, using a filter or surge suppressor is recommended.  
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CHAPTER 3 | Installing the Switch  
Ethernet Cabling  
ETHERNET CABLING  
To ensure proper operation when installing the switches into a network, make  
sure that the current cables are suitable for 10BASE-T, 100BASE-TX or  
1000BASE-T operation. Check the following criteria against the current  
installation of your network:  
ꢀꢁ Cable type: Unshielded twisted pair (UTP) or shielded twisted pair (STP)  
cables with RJ-45 connectors; Category 3 or better for 10BASE-T, Category  
5 or better for 100BASE-TX, and Category 5, 5e or 6 for 1000BASE-T.  
ꢀ
ꢀ
ꢀ
ꢁ Protection from radio frequency interference emissions  
ꢁ Electrical surge suppression  
ꢁ Separation of electrical wires (switch related or other) and electromagnetic  
fields from data based network wiring  
ꢀꢁ Safe connections with no damaged cables, connectors or shields  
Figure 12: RJ-45 Connections  
RJ-45  
C
onnector  
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CHAPTER 3 | Installing the Switch  
Equipment Checklist  
EQUIPMENT CHECKLIST  
After unpacking this switch, check the contents to be sure you have received all  
the components. Then, before beginning the installation, be sure you have all  
other necessary installation equipment.  
PACKAGE CONTENTS  
ꢀꢁ 24- or 48-port Gigabit Ethernet Switch (LGB6026A or LGB6050A)  
ꢀꢁ Four adhesive foot pads  
ꢀꢁ Bracket Mounting Kit containing two brackets and eight screws for attaching  
the brackets to the switch  
ꢀ
ꢀ
ꢀ
ꢀ
ꢁ Power cord—either US, Continental Europe or UK  
ꢁ Console cable (RJ-45 to RS-232)  
ꢁ This Installation Guide  
ꢁ Management Guide CD  
OPTIONAL RACK-MOUNTING EQUIPMENT  
If you plan to rack-mount the switch, be sure to have the following equipment  
available:  
ꢀꢁ Four mounting screws for each device you plan to install in a rack—these  
are not included  
ꢀꢁ A screwdriver (Phillips or flathead, depending on the type of screws used)  
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CHAPTER 3 | Installing the Switch  
Mounting  
MOUNTING  
The switch can be mounted in a standard 19-inch equipment rack or on a  
desktop or shelf. Mounting instructions for each type of site follow.  
RACK MOUNTING  
Before rack mounting the switch, pay particular attention to the following  
factors:  
ꢀꢁ Temperature: Since the temperature within a rack assembly may be higher  
than the ambient room temperature, check that the rack-environment  
temperature is within the specified operating temperature range. (See  
page 78.)  
ꢀ
ꢀ
ꢀ
ꢁ Mechanical Loading: Do not place any equipment on top of a rack-mounted  
unit.  
ꢁ Circuit Overloading: Be sure that the supply circuit to the rack assembly is  
not overloaded.  
ꢁ Grounding: Rack-mounted equipment should be properly grounded.  
Particular attention should be given to supply connections other than direct  
connections to the mains.  
To rack-mount devices:  
1. Attach the brackets to the device using the screws provided in the Bracket  
Mounting Kit.  
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CHAPTER 3 | Installing the Switch  
Mounting  
Figure 13: Attaching the Brackets  
2. Mount the device in the rack, using four rack-mounting screws (not  
provided).  
Figure 14: Installing the Switch in a Rack  
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CHAPTER 3 | Installing the Switch  
Mounting  
3. If installing a single switch only, turn to “Connecting to a Power Source”  
on page 51.  
4. If installing multiple switches, mount them in the rack, one below the other,  
in any order.  
5. If also installing an RPS, mount it in the rack below the other devices.  
DESKTOP OR SHELF MOUNTING  
1. Attach the four adhesive feet to the bottom of the first switch.  
Figure 15: Attaching the Adhesive Feet  
2. Set the device on a flat surface near an AC power source, making sure there  
are at least two inches of space on all sides for proper air flow.  
3. If installing a single switch only, go to “Connecting to a Power Source” on  
page 51.  
4. If installing multiple switches, attach four adhesive feet to each one. Place  
each device squarely on top of the one below, in any order.  
5. If also installing an RPS, place it close to the stack.  
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CHAPTER 3 | Installing the Switch  
Installing an Optional Module into the Switch  
INSTALLING AN OPTIONAL MODULE INTO THE SWITCH  
Figure 16: Installing an Optional Module  
NOTE: The slide-in modules are hot-swappable, you do not need to  
power off the switch before installing or removing a module.  
To install an optional module into the switch, do the following:  
1. Remove the blank metal plate (or a previously installed module) from the  
appropriate slot by removing the two screws with a flat-head screwdriver.  
2. Before opening the package that contains the module, touch the bag to the  
switch casing to discharge any potential static electricity. Also, it is  
recommended to use an ESD wrist strap during installation.  
3. Remove the module from the anti-static shielded bag.  
4. Holding the module level, guide it into the carrier rails on each side and  
gently push it all the way into the slot, ensuring that it firmly engages with  
the connector.  
5. If you are sure the module is properly mated with the connector, tighten the  
retainer screws to secure the module in the slot.  
6. The Module LED on the switch’s front panel should turn green to confirm  
that the module is correctly installed and ready to use.  
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CHAPTER 3 | Installing the Switch  
Installing an Optional SFP Transceiver  
INSTALLING AN OPTIONAL SFP TRANSCEIVER  
Figure 17: Inserting an SFP Transceiver into a Slot  
These switches support 1000BASE-SX and 1000BASE-LX, and 1000BASE-LH  
SFP-compatible transceivers. To install an SFP transceiver, do the following:  
1. Consider network and cabling requirements to select an appropriate SFP  
transceiver type.  
2. Insert the transceiver with the optical connector facing outward and the slot  
connector facing down. Note that SFP transceivers are keyed so they can  
only be installed in one orientation.  
3. Slide the SFP transceiver into the slot until it clicks into place.  
NOTE: SFP transceivers are hot-swappable. The switch does not need  
to be powered off before installing or removing a transceiver. However,  
always first disconnect the network cable before removing a  
transceiver.  
NOTE: SFP transceivers are not provided in the switch package.  
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CHAPTER 3 | Installing the Switch  
Connecting Switches in a Stack  
CONNECTING SWITCHES IN A STACK  
Figure 18 shows how the stack cables are connected between switches in a  
stack. Each stacking connection is a 48 Gbps full-duplex high-speed serial link  
using proprietary stacking cables (part numbers LGB6000SC-001 or  
LGB6000SC-004). The switch supports a line- and ring-topology stacking  
configuration, or can be used stand alone. To ensure minimal disruption in case  
a unit or stacking cable fails, we recommend always use a ring-topology.  
In line-topology stacking there is a single stack cable connection between each  
switch that carries two-way communications across the stack. In ring-topology  
stacking, an extra cable is connected between the top and bottom switches  
forming a “ring” or “closed-loop.” The closed-loop cable provides a redundant  
path for the stack link, so if one link fails, stack communications can still be  
maintained. Figure 18 illustrates a ring-topology stacking configuration.  
To connect up to eight switches in a stack, perform the following steps:  
1. Plug one end of the stack cable (ordered separately) in the Down (right)  
port of the top unit.  
2. Plug the other end of the stack cable into the Up (left) port of the next unit.  
3. Repeat steps 1 and 2 for each unit in the stack. Form a simple chain starting  
at the Down port on the top unit and ending at the Up port on the bottom  
unit (stacking up to 8 units).  
4. (Optional) To form a wrap-around topology, plug one end of a stack cable  
into the Down port on the bottom unit and the other end into the Up port on  
the top unit.  
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CHAPTER 3 | Installing the Switch  
Connecting Switches in a Stack  
Figure 18: Making Stacking Connections  
5. Select the Master unit in the stack by pressing the Master button in on only  
one of the switches. Only one switch in the stack can operate as the Master,  
all other units operate in slave mode. If more than one switch in the stack is  
selected as Master, or if no switches are selected, the system will select the  
unit with the lowest MAC address as the Master.  
STACKING TOPOLOGIES  
All units in the stack must be connected via stacking cable (part numbers  
LGB6000SC-001 or LGB6000SC-004). You can connect units in a simple  
cascade configuration, connecting Down ports to Up ports, from the top unit to  
the bottom unit. Using this “line” topology, if any link or unit in the stack fails,  
the stack is split and two separate segments are formed. The Stack Link LEDs  
on the units that are disconnected flash to indicate that the stack link between  
them is not functioning (see Table 2, “System Status LEDs,” on page 27).  
When using line topology and a stack link failure occurs, the stack reboots and a  
Master unit is selected within each of the two stack segments. The Master unit  
will be either the unit with the Master button depressed or the unit with the  
lowest MAC address if the Master button is not depressed on any unit. When the  
stack reboots and resumes operations, note that the IP address will be the same  
for both of the stack segments. To resolve the conflicting IP addresses, you  
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CHAPTER 3 | Installing the Switch  
Connecting to a Power Source  
should manually replace the failed link or unit as soon as possible. If you are  
using a wrap-around stack topology, a single point of failure in the stack will not  
cause the stack to fail. It would take two or more points of failure to break the  
stack apart.  
If the Master unit fails or is powered off, the backup unit will take control of the  
stack without any loss of configuration settings. The Slave unit with the lowest  
MAC address is selected as the backup unit.  
CONNECTING TO A POWER SOURCE  
To connect a switch to a power source:  
1. Insert the power cable plug directly into the AC socket located at the back of  
the switch.  
Figure 19: Power Socket  
2. Plug the other end of the cable into a grounded, 3-pin, AC power source.  
NOTE: For International use, you may need to change the AC line  
cord. You must use a line cord set that has been approved for the  
socket type in your country.  
3. Check the front-panel LEDs as the device is powered on to be sure the PWR  
LED is lit. If not, check that the power cable is correctly plugged in.  
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CHAPTER 3 | Installing the Switch  
Connecting to the Console Port  
4. If you have purchased a Redundant Power Supply, connect it to the switch  
and to an AC power source now, following the instructions included with the  
package.  
CONNECTING TO THE CONSOLE PORT  
The RJ-45 serial port on the switch’s front panel is used to connect to the switch  
for out-of-band console configuration. The on-board configuration program can  
be accessed from a terminal or a PC running a terminal emulation program. The  
pin assignments used to connect to the serial port are provided in the following  
table.  
Figure 20: Serial Port (RJ-45) Pin-Out  
8
8
1
1
WIRING MAP FOR SERIAL CABLE  
Table 5: Serial Cable Wiring  
Switch’s 9-Pin  
Serial Port  
Null Modem  
PC’s 9-Pin  
DTE Port  
6 RXD (receive data)  
<--------------------- 3 TXD (transmit data)  
3 TXD (transmit data) ---------------------> 2 RXD (receive data)  
5 SGND (signal ground) ----------------------- 5 SGND (signal  
ground) No other pins are used.  
The serial port’s configuration requirements are as follows:  
ꢀꢁ Default Baud rate—115,200 bps  
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CHAPTER 3 | Installing the Switch  
Connecting to the Console Port  
ꢀ
ꢁ Character Size—8 Characters  
ꢁ Parity—None  
ꢀ
ꢀ
ꢀ
ꢀ
ꢁ Stop bit—One  
ꢁ Data bits—8  
ꢁ Flow control—none  
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CHAPTER 3 | Installing the Switch  
Connecting to the Console Port  
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4
MAKING NETWORK CONNECTIONS  
CONNECTING NETWORK DEVICES  
This switch is designed to interconnect multiple segments (or collision domains).  
It can be connected to network cards in PCs and servers, as well as to hubs,  
switches or routers. It may also be connected to devices using optional SFP+ or  
SFP transceivers.  
TWISTED-PAIR DEVICES  
Each device requires an unshielded twisted-pair (UTP) cable with RJ-45  
connectors at both ends. Use Category 5, 5e or 6 cable for 1000BASE-T  
connections, Category 5 or better for 100BASE-TX connections, and Category 3  
or better for 10BASE-T connections.  
CABLING GUIDELINES  
The RJ-45 ports on the switch support automatic MDI/MDI-X pinout  
configuration, so you can use standard straight-through twisted-pair cables to  
connect to any other network device (PCs, servers, switches, routers, or hubs).  
See Appendix B for further information on cabling.  
CAUTION: Do not plug a phone jack connector into an RJ-45 port. This  
will damage the switch. Use only twisted-pair cables with RJ-45  
connectors that conform to FCC standards.  
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CHAPTER 4 | Making Network Connections  
Twisted-Pair Devices  
CONNECTING TO PCS, SERVERS, HUBS AND SWITCHES  
1. Attach one end of a twisted-pair cable segment to the device’s RJ-45  
connector.  
Figure 21: Making Twisted-Pair Connections  
2. If the device is a network card and the switch is in the wiring closet, attach  
the other end of the cable segment to a modular wall outlet that is  
connected to the wiring closet. (See the section “Network Wiring  
Connections” on page 57.) Otherwise, attach the other end to an available  
port on the switch.  
Make sure each twisted pair cable does not exceed 100 meters (328 ft) in  
length.  
NOTE: Avoid using flow control on a port connected to a hub unless it  
is actually required to solve a problem. Otherwise back pressure  
jamming signals may degrade overall performance for the segment  
attached to the hub.  
3. As each connection is made, the Link LED (on the switch) corresponding to  
each port will light green (1000 Mbps) or yellow (10/100 Mbps) to indicate  
that the connection is valid.  
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CHAPTER 4 | Making Network Connections  
Twisted-Pair Devices  
NETWORK WIRING CONNECTIONS  
Today, the punch-down block is an integral part of many of the newer equipment  
racks. It is actually part of the patch panel. Instructions for making connections  
in the wiring closet with this type of equipment follows.  
1. Attach one end of a patch cable to an available port on the switch, and the  
other end to the patch panel.  
2. If not already in place, attach one end of a cable segment to the back of the  
patch panel where the punch-down block is located, and the other end to a  
modular wall outlet.  
3. Label the cables to simplify future troubleshooting. See “Cable Labeling and  
Connection Records” on page 65.  
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CHAPTER 4 | Making Network Connections  
Fiber Optic SFP Devices  
Figure 22: Network Wiring Connections  
Equipment Rack  
(side view)  
Network Switch  
t
L  
0  
Punch-Down Block  
Patc Panel  
h
Wall  
FIBER OPTIC SFP DEVICES  
An optional Gigabit SFP transceiver (1000BASE-SX, 1000BASE-LX or 1000BASE-  
LH) can be used for a backbone connection between switches, or for connecting  
to a high-speed server.  
Each single-mode fiber port requires 9/125 micron single-mode fiber optic cable  
with an LC connector at both ends. Each multimode fiber optic port requires 50/  
125 or 62.5/125 micron multimode fiber optic cabling with an LC connector at  
both ends.  
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CHAPTER 4 | Making Network Connections  
Fiber Optic SFP Devices  
WARNING: This switch uses lasers to transmit signals over fiber optic  
cable. The lasers are compliant with the requirements of a Class 1  
Laser Product and are inherently eye safe in normal operation.  
However, you should never look directly at a transmit port when it is  
powered on.  
WARNING: When selecting a fiber SFP device, considering safety,  
please make sure that it can function at a temperature that is not less  
than the recommended maximum operational temperature of the  
product. You must also use an approved Laser Class 1 SFP transceiver.  
1. Remove and keep the LC port’s rubber plug. When not connected to a fiber  
cable, the rubber plug should be replaced to protect the optics.  
2. Check that the fiber terminators are clean. You can clean the cable plugs by  
wiping them gently with a clean tissue or cotton ball moistened with a little  
ethanol. Dirty fiber terminators on fiber optic cables will impair the quality  
of the light transmitted through the cable and lead to degraded performance  
on the port.  
3. Connect one end of the cable to the LC port on the switch and the other end  
to the LC port on the other device. Since LC connectors are keyed, the cable  
can be attached in only one orientation.  
Figure 23: Making Fiber Port Connections  
4. As a connection is made, check the Link LED on the switch corresponding to  
the port to be sure that the connection is valid.  
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CHAPTER 4 | Making Network Connections  
Fiber Optic SFP Devices  
The 1000BASE-SX, 1000BASE-LX, 1000BASE-LH fiber optic ports operate at  
1 Gbps, full duplex, with auto-negotiation of flow control. The maximum length  
for fiber optic cable operating at Gigabit speed will depend on the fiber type as  
listed under “1000 Mbps Gigabit Ethernet Collision Domain” on page 64.  
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CHAPTER 4 | Making Network Connections  
10 Gbps Fiber Optic Connections  
10 GBPS FIBER OPTIC CONNECTIONS  
An optional 10 Gigabit transceiver (SFP+) can be used for a backbone  
connection between switches.  
Single-mode fiber ports require 9/125 micron single-mode fiber optic cable.  
Multimode fiber optic ports require 50/125 or 62.5/125 micron multimode fiber  
optic cable. Each fiber optic cable must have an LC connector attached at both  
ends.  
WARNING: These switches use lasers to transmit signals over fiber  
optic cable. The lasers are compliant with the requirements of a Class 1  
Laser Product and are inherently eye safe in normal operation.  
However, you should never look directly at a transmit port when it is  
powered on.  
WARNING: When selecting a fiber device, considering safety, please  
make sure that it can function at a temperature that is not less than the  
recommended maximum operational temperature of the product. You  
must also use an approved Laser Class 1 SFP transceiver  
.
1. Remove and keep the port’s protective cover. When not connected to a fiber  
cable, the cover should be replaced to protect the optics.  
2. Check that the fiber terminators are clean. You can clean the cable plugs by  
wiping them gently with a clean tissue or cotton ball moistened with a little  
ethanol. Dirty fiber terminators on fiber cables will impair the quality of the  
light transmitted through the cable and lead to degraded performance on  
the port.  
3. Connect one end of the cable to the LC port on the switch and the other end  
to the LC port on the other device. Since LC connectors are keyed, the cable  
can be attached in only one orientation.  
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CHAPTER 4 | Making Network Connections  
10 Gbps Fiber Optic Connections  
Figure  
24:  
Connecting to  
an  
SFP+  
Transceiver  
4. As a connection is made, check the Link LED on the module to be sure that  
the connection is valid.  
The 10G fiber optic ports operate at 10 Gbps full duplex. The maximum length  
for fiber optic cable operating at 10 Gbps will depend on the fiber type as listed  
under “10 Gbps Ethernet Collision Domain” on page 63.  
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CHAPTER 4 | Making Network Connections  
Connectivity Rules  
CONNECTIVITY RULES  
When adding hubs (repeaters) to your network, please follow the connectivity  
rules listed in the manuals for these products. However, note that because  
switches break up the path for connected devices into separate collision  
domains, you should not include the switch or connected cabling in your  
calculations for cascade length involving other devices.  
1000BASE-T CABLE REQUIREMENTS  
All Category 5 UTP cables that are used for 100BASE-TX connections should also  
work for 1000BASE-T, providing that all four wire pairs are connected. However,  
it is recommended that for all critical connections, or any new cable installations,  
Category 5e (enhanced Category 5) or Category 6 cable should be used. The  
Category 5e specification includes test parameters that are only  
recommendations for Category 5. Therefore, the first step in preparing existing  
Category 5 cabling for running 1000BASE-T is a simple test of the cable  
installation to be sure that it complies with the IEEE 802.3-2005 standards.  
10 GBPS ETHERNET COLLISION DOMAIN  
Table 6: Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Fiber Size  
Fiber Bandwidth  
160 MHz/km  
200 MHz/km  
400 MHz/km  
500 MHz/km  
2000 MHz/km  
Maximum Cable Length  
2-26 m (7-85 ft.)  
Connector  
LC  
LC  
LC  
LC  
LC  
62.5/125 micron  
single-mode fiber  
2-33 m (7-108 ft.)  
2-66 m (7-216 ft.)  
2-82 m (7-269 ft.)  
2-300 m (7-984 ft.)  
50/125 micron  
single-mode fiber  
Table 7: Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
N/A  
10 km (6.2 miles)  
LC  
9/125 micron single-  
mode fiber  
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CHAPTER 4 | Making Network Connections  
Connectivity Rules  
Table 8: Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
N/A  
40 km (24.85 miles)  
LC  
9/125 micron single-  
mode fiber  
1000 MBPS GIGABIT ETHERNET COLLISION DOMAIN  
Table 9: Maximum 1000BASE-T Gigabit Ethernet Cable Length  
Cable Type  
Maximum Cable Length  
Connector  
Category 5, 5e, or 6 100-ohm UTP or STP  
100 m (328 ft)  
RJ-45  
Table 10: Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Fiber Size  
Fiber Bandwidth  
160 MHz/km  
200 MHz/km  
400 MHz/km  
500 MHz/km  
Maximum Cable Length  
2-220 m (7-722 ft)  
Connector  
LC  
LC  
LC  
LC  
62.5/125 micron  
multimode fiber  
2-275 m (7-902 ft)  
2-500 m (7-1641 ft)  
2-550 m (7-1805 ft)  
50/125 micron  
multimode fiber  
Table 11: Maximum 1000BASE-LX Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
N/A  
2 m - 5 km (7 ft - 3.2 miles) LC  
9/125 micron single-  
mode fiber  
Table 12: Maximum 1000BASE-LH Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
9/125 micron single- N/A  
mode fiber  
2 m - 70 km  
(7 ft - 43.5 miles)  
LC  
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CHAPTER 4 | Making Network Connections  
Cable Labeling and Connection Records  
100 MBPS FAST ETHERNET COLLISION DOMAIN  
Table 13: Maximum Fast Ethernet Cable Lengths  
Type  
Cable Type  
Max. Cable Length  
Connector  
100 m (328 ft)  
RJ-45  
100BASE-TX  
Category 5orbetter 100-ohm  
UTP or STP  
10 MBPS ETHERNET COLLISION DOMAIN  
Table 14: Maximum Ethernet Cable Length  
Type  
Cable Type  
Max. Cable Length  
Connector  
10BASE-T  
Category 3 or better 100-ohm UTP  
100 m (328 ft)  
RJ-45  
CABLE LABELING AND CONNECTION RECORDS  
When planning a network installation, it is essential to label the opposing ends of  
cables and to record where each cable is connected. Doing so will enable you to  
easily locate inter-connected devices, isolate faults and change your topology  
without need for unnecessary time consumption.  
To best manage the physical implementations of your network, follow these  
guidelines:  
ꢀꢁ Clearly label the opposing ends of each cable.  
ꢀꢁ Using your building’s floor plans, draw a map of the location of all network-  
connected equipment. For each piece of equipment, identify the devices to  
which it is connected.  
ꢀ
ꢀ
ꢀ
ꢁ Note the length of each cable and the maximum cable length supported by  
the switch ports.  
ꢁ For ease of understanding, use a location-based key when assigning  
prefixes to your cable labeling.  
ꢁ Use sequential numbers for cables that originate from the same equipment.  
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CHAPTER 4 | Making Network Connections  
Cable Labeling and Connection Records  
ꢀ
ꢁ Differentiate between racks by naming accordingly.  
ꢁ Label each separate piece of equipment.  
ꢀ
ꢀꢁ Display a copy of your equipment map, including keys to all abbreviationsat  
each equipment rack.  
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A
TROUBLESHOOTING  
DIAGNOSING SWITCH INDICATORS  
Table 15: Troubleshooting Chart  
Symptom  
Action  
PWR LED is Off  
ꢀꢁ  
Check connections between the switch, the power cord and  
the wall outlet.  
ꢀꢁꢁꢁꢁContact your dealer for assistance.  
Power LED is Amber  
ꢀꢁ  
Internal power supply has failed. Contact your local dealer  
for assistance.  
ꢀ
ꢁ
Power cycle the switch to try and clear the condition.  
DIAG LED Flashing  
Yellow  
ꢀꢁ  
If the condition does not clear, contact your dealer for  
assistance.  
Stack Master LED is  
Flashing Amber  
ꢀꢁ  
The stack has not completed its initial configuration. Wait a  
few minutes for the process to complete.  
ꢀꢁ  
Check that all stacking cables are properly connected.  
Stack Link LED is  
Flashing Green/Amber  
ꢀꢁ  
The uplink/downlink has failed.  
ꢀꢁ  
For the indicated stack link, check that the stacking cables  
are properly connected. Replace the stacking cable if  
necessary (part numbers LGB6000SC-001or LGB6000SC-004).  
ꢀꢁ  
Power cycle the switch to try and clear the condition.  
Link LED is Off  
ꢀꢁ  
Verify that the switch and attached device are powered on.  
ꢀꢁꢁꢁꢁBe sure the cable is plugged into both the switch and  
corresponding device.  
ꢀꢁꢁꢁꢁIf the switch is installed in a rack, check the connections to  
the punch-down block and patch panel.  
ꢀꢁꢁꢁꢁVerify that the proper cable type is used and its length does  
not exceed specified limits.  
ꢀꢁꢁꢁꢁCheck the adapter on the attached device and cable  
connections for possible defects. Replace the defective  
adapter or cable if necessary.  
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CHAPTER A | Troubleshooting  
Diagnosing Switch Indicators  
DIAGNOSING POWER PROBLEMS WITH THE LEDS  
The Power and RPU LEDs work in combination to indicate power status as  
follows.  
Table 16: Power/RPS LEDs  
Power LED RPU LED  
Status  
Green  
Green  
Green  
Amber  
Off  
Green  
Amber  
Off  
Internal power functioning normally; RPU is present.  
Internal power functioning normally; RPU plugged in but faulty.  
Internal power functioning normally; RPU not plugged in.  
Internal power faulty; RPU delivering power.  
Both internal power and RPU unplugged or not functioning.  
Green  
Off  
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CHAPTER A | Troubleshooting  
Power and Cooling Problems  
POWER AND COOLING PROBLEMS  
If the power indicator does not turn on when the power cord is plugged in, you  
may have a problem with the power outlet, power cord, or internal power  
supply. However, if the unit powers off after running for a while, check for loose  
power connections, power losses or surges at the power outlet. If you still  
cannot isolate the problem, the internal power supply may be defective.  
INSTALLATION  
Verify that all system components have been properly installed. If one or more  
components appear to be malfunctioning (such as the power cord or network  
cabling), test them in an alternate environment where you are sure that all the  
other components are functioning properly.  
IN-BAND ACCESS  
You can access the management agent in the switch from anywhere within the  
attached network using Telnet, a web browser, or other network management  
software tools. However, you must first configure the switch with a valid IP  
address, subnet mask, and default gateway. If you have trouble establishing a  
link to the management agent, check to see if you have a valid network  
connection. Then verify that you entered the correct IP address. Also, be sure  
the port through which you are connecting to the switch has not been disabled  
If it has not been disabled, then check the network cabling that runs between  
your remote location and the switch.  
.
NOTE: The management agent accepts up to four simultaneous Telnet  
sessions. If the maximum number of sessions already exists, an  
additional Telnet connection will not be able to log into the system.  
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CHAPTER A | Troubleshooting  
Stack Troubleshooting  
STACK TROUBLESHOOTING  
If a stack fails to initialize or function, first check the following items:  
ꢀ
ꢀ
ꢀ
ꢀ
ꢁ Check that all stacking cables are properly connected.  
ꢁ Check if any stacking cables appear damaged.  
ꢁ Check that only one Stack Master button is pressed in.  
ꢁ Check that all switches in the stack are powered on.  
After checking all items, reboot all the switches in the stack.  
Switches in the stack may be configured using a ring- or line-topology. To ensure  
minimal disruption in case a unit or stacking cable fails, always use a ring-  
topology. When using ring-topology configuration and a switch fails, or a  
stacking cable is disconnected, the stack continues normal operation using line-  
topology stacking through the remaining stack connections.  
If any changes occur to a slave unit, such as unit failure or insertion of a new  
unit, operation of the other units in the stack are not affected. On the other  
hand, if the master unit fails, the unit with the lowest MAC address is elected as  
the new master. The stack reboots, discovers the new stack topology, assigns  
identifiers to each unit, and checks the software images on each unit. This  
process make take up to two minutes.  
If you do not connect a wrap-around cable from the bottom unit back up to the  
top unit in the stack, the failure of a single unit will cause the stack to break into  
two separate stacks. In this case, a master unit will be elected for both of the  
stacks. However, backup information inherited from the previous master unit will  
cause the same IP address to be used by both master units in the two stacks.  
You must therefore manually reconfigure the IP address of the management  
interface on one of the master units.  
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70 –  
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B
CABLES  
TWISTED-PAIR CABLE AND PIN ASSIGNMENTS  
For 10/100BASE-TX connections, the twisted-pair cable must have two pairs of  
wires. For 1000BASE-T connections the twisted-pair cable must have four pairs  
of wires. Each wire pair is identified by two different colors. For example, one  
wire might be green and the other, green with white stripes. Also, an RJ-45  
connector must be attached to both ends of the cable.  
CAUTION: DO NOT plug a phone jack connector into any RJ-45 port.  
Use only twisted-pair cables with RJ-45 connectors that conform with  
FCC standards.  
CAUTION: Each wire pair must be attached to the RJ-45 connectors in  
a specific orientation.  
The figure below illustrates how the pins on the RJ-45 connector are numbered.  
Be sure to hold the connectors in the same orientation when attaching the wires  
to the pins.  
Figure 25: RJ-45 Connector Pin Numbers  
8
1
1
8
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CHAPTER B | Cables  
Twisted-Pair Cable and Pin Assignments  
10BASE-T/100BASE-TX PIN ASSIGNMENTS  
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45  
connections: 100-ohm Category 3 or better cable for 10 Mbps connections, or  
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure that  
the length of any twisted-pair connection does not exceed 100 meters (328 feet).  
The RJ-45 ports on the switch base unit support automatic MDI/MDI-X  
operation, so you can use straight-through cables for all network connections to  
PCs or servers, or to other switches or hubs. In straight-through cable, pins 1, 2,  
3, and 6, at one end of the cable, are connected straight through to pins 1, 2, 3,  
and 6 at the other end of the cable. When using any RJ-45 port on this switch,  
you can use either straight-through or crossover cable.  
Table 17: 10/100BASE-TX MDI and MDI-X Port Pinouts  
Pin  
1
MDI Signal Name  
MDI-X Signal Name  
Transmit Data plus (TD+)  
Transmit Data minus (TD-)  
Receive Data plus (RD+)  
Receive Data minus (RD-)  
2
3
Receive Data plus (RD+)  
Receive Data minus (RD-)  
Not used  
Transmit Data plus (TD+)  
Transmit Data minus (TD-)  
Not used  
6
4,5,7,8  
Note:The “+” and “-” signs represent the polarity of the wires that  
make up each wire pair.  
STRAIGHT-THROUGH WIRING  
If the twisted-pair cable is to join two ports and only one of the ports has an  
internal crossover (MDI-X), the two pairs of wires must be straight-through.  
(When auto-negotiation is enabled for any RJ-45 port on this switch, you can  
use either straight-through or crossover cable to connect to any device type.)  
You must connect all four wire pairs as shown in the following diagram to  
support Gigabit Ethernet.  
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72 –  
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CHAPTER B | Cables  
Twisted-Pair Cable and Pin Assignments  
Figure 26: Straight-through Wiring  
EIA/TIA 568B RJ-45 Wiring Standard  
10 100BASE-TX Straight-through Cable  
/
W
hit  
e
/Orange Stripe  
Orange  
W hi  
Blue W hi  
ripe Green  
Brown S  
t
e
/
Green Stripe  
1
2
3
4
5
6
7
8
1
2
End  
A
End  
B
t
e/Blue  
3
4
5
6
7
8
S
t
W hi  
t
e
/
tripe  
Brown  
CROSSOVER WIRING  
If the twisted-pair cable is to join two ports and either both ports are labeled  
with an “X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover  
must be implemented in the wiring. (When auto-negotiation is enabled for any  
RJ-45 port on this switch, you can use either straight-through or crossover cable  
to connect to any device type.)  
You must connect all four wire pairs as shown in the following diagram to  
support Gigabit Ethernet.  
Figure 27: Crossover Wiring  
EIA/TIA 568B RJ-45 Wiring Standard  
10/100BASE-TX Crossover Cable  
W hi  
t
e
/
Orange S  
Orange  
Green Stripe  
Blue W hi e/Blue  
ripe Green  
Brown S  
tripe  
W hi  
te/  
1
2
3
4
5
6
7
8
1
2
End  
A
End  
B
t
3
4
5
6
7
8
S
t
W hi  
t
e
/
tripe  
Brown  
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73 –  
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CHAPTER B | Cables  
Twisted-Pair Cable and Pin Assignments  
1000BASE-T PIN ASSIGNMENTS  
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use  
straight-through cables for all network connections to PCs or servers, or to other  
switches or hubs.  
The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These  
ports require that all four pairs of wires be connected. Note that for 1000BASE-T  
operation, all four pairs of wires are used for both transmit and receive.  
Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded  
twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that the  
length of any twisted-pair connection does not exceed 100 meters (328 feet).  
Table 18: 1000BASE-T MDI and MDI-X Port Pinouts  
Pin MDI Signal Name  
MDI-X Signal Name  
1
2
3
4
5
6
7
8
Bi-directional Pair A Plus (BI_DA+)  
Bi-directional Pair A Minus (BI_DA-)  
Bi-directional Pair B Plus (BI_DB+)  
Bi-directional Pair C Plus (BI_DC+)  
Bi-directional Pair C Minus (BI_DC-)  
Bi-directional Pair B Minus (BI_DB-)  
Bi-directional Pair D Plus (BI_DD+)  
Bi-directional Pair D Minus (BI_DD-)  
Bi-directional Pair B Plus (BI_DB+)  
Bi-directional Pair B Minus (BI_DB-)  
Bi-directional Pair A Plus (BI_DA+)  
Bi-directional Pair D Plus (BI_DD+)  
Bi-directional Pair D Minus (BI_DD-)  
Bi-directional Pair A Minus (BI_DA-)  
Bi-directional Pair C Plus (BI_DC+)  
Bi-directional Pair C Minus (BI_DC-)  
CABLE TESTING FOR EXISTING CATEGORY 5 CABLE  
Installed Category 5 cabling must pass tests for Attenuation, Near-End Crosstalk  
(NEXT), and Far-End Crosstalk (FEXT). This cable testing information is specified  
in the ANSI/TIA/EIA-TSB-67 standard. Additionally, cables must also pass test  
parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These  
tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional  
Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”  
Note that when testing your cable installation, be sure to include all patch cables  
between switches and end devices.  
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74 –  
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CHAPTER B | Cables  
Fiber Standards  
ADJUSTING EXISTING CATEGORY 5 CABLING TO RUN 1000BASE-T  
If your existing Category 5 installation does not meet one of the test parameters  
for 1000BASE-T, there are basically three measures that can be applied to try  
and correct the problem:  
1. Replace any Category 5 patch cables with high-performance Category 5e or  
Category 6 cables.  
2. Reduce the number of connectors used in the link.  
3. Reconnect some of the connectors in the link.  
FIBER STANDARDS  
The International Telecommunication Union (ITU-T) has standardized various  
fiber types for data networks. These are summarized in the following table.  
Table 19: Fiber Standards  
Description  
Application  
ITU-T  
Standard  
G.651  
G.652  
Multimode Fiber  
50/125-micron core  
Short-reach connections in the 1300-  
nm or 850-nm band  
Non-Dispersion-Shifted Fiber  
Single-mode, 9/125-micron core  
Longer spans and extended reach.  
Optimized for operation in the 1310-  
nm band. but can also be used in the  
1550-nm band  
Longer spans and extended reach.  
Optimized for wavelength-division  
multiplexing (WDM) transmission  
across wavelengths from 1285 to  
1625 nm. The zero dispersion  
G.652.C  
G.653  
Low Water Peak Non-  
Dispersion-Shifted Fiber  
Single-mode, 9/125-micron core  
wavelength is in the 1310-nm region.  
Dispersion-Shifted Fiber  
Single-mode, 9/125-micron core  
Longer spans and extended reach.  
Optimized for operation in the region  
from 1500 to 1600-nm.  
–
75 –  
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CHAPTER B | Cables  
Fiber Standards  
Table 19: Fiber Standards (Continued)  
Description  
Application  
ITU-T  
Standard  
G.654  
G.655  
1550-nm Loss-Minimized Fiber  
Single-mode, 9/125-micron core  
Extended long-haul applications.  
Optimized for high-power  
transmission in the 1500 to 1600-nm  
region, with low loss in the 1550-nm  
band.  
Extended long-haul applications.  
Optimized for high-power dense  
wavelength-division multiplexing  
(DWDM) operation in the region from  
1500 to 1600-nm.  
Non-Zero Dispersion-Shifted  
Fiber  
Single-mode, 9/125-micron core  
–
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C
SPECIFICATIONS  
PHYSICAL CHARACTERISTICS  
PORTS  
LGB6026A:20 10/100/1000BASE-T, with auto-negotiation  
4 10/100/1000BASE-T shared with 4 SFP transceiver slots  
2 10GBASE extender module slots for SFP+ transceivers  
Two slots for stacking transceivers  
LGB6050A:44 10/100/1000BASE-T, with auto-negotiation  
4 10/100/1000BASE-T shared with 4 SFP transceiver slots  
2 10GBASE extender module slots for SFP+ transceivers  
Two slots for stacking transceivers  
NETWORK INTERFACE  
Ports 1-24/48: RJ-45 connector, auto MDI/MDI-X  
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)  
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)  
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)  
*Maximum Cable Length - 100 m (328 ft)  
Ports 25-28: RJ-45/SFP shared ports  
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)  
*Maximum Cable Length - 100 m (328 ft)  
Gigabit fiber transmission: SFP transceiver slots  
*The maximum length for fiber optic cable operating at Gigabit speed will  
depend on the fiber type as listed under “1000 Mbps Gigabit Ethernet  
Collision Domain” on page 64.  
BUFFER ARCHITECTURE  
LGB6026A: 2 Mbytes  
LGB6050A: 2 Mbytes  
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CHAPTER C | Specifications  
Physical Characteristics  
AGGREGATE BANDWIDTH  
LGB6026A: 88 Gbps  
LGB6050A: 136 Gbps  
SWITCHING DATABASE  
16K MAC address entries, 1024 static MAC addresses;  
8K IPv4 and 4K IPv6 entries in host table, 4K ARP entries,  
12K IPv4 or 6K IPv6 entries in the IP routing table,  
64 static IP routes, 32 IP interfaces; 255 multicast groups  
LEDS  
System: Stack Master, Stack Link, Module, Power, Diag,  
RPS Port: Status (link,speed, activity)  
WEIGHT  
LGB6026A: 5.7 kg (12.6 lbs)  
LGB6050A: 6.1 kg (13.4 lbs)  
SIZE  
44.0 x 41.5 x 4.4 cm (17.3 x 16.3 x 1.7 in.)  
TEMPERATURE  
Operating: 0 to 50 °C (32 to 122 °F)  
Storage: -40 to 70 °C (-40 to 158 °F)  
HUMIDITY  
Operating: 5% to 95% (non-condensing)  
AC INPUT  
100 to 240 V, 50-60 Hz, 2A  
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CHAPTER C | Specifications  
Switch Features  
POWER SUPPLY  
Internal, auto-ranging transformer: 100 to 240 VAC, 47 to 63 Hz  
External, supports connection for redundant power supply  
POWER CONSUMPTION  
LGB6026A: 66 Watts (without expansion modules)  
80 Watts (with two expansion modules [LGB6001C])  
LGB6050A: 100 Watts (without expansion modules)  
130 Watts (with two expansion modules [LGB6001C])  
MAXIMUM CURRENT  
LGB6026A: 1 A @ 110 VAC (without expansion modules)  
1.1 A @ 110 VAC (with two expansion modules [LGB6001C])  
0.38 A @ 240 VAC (without expansion modules)  
0.44 A @ 240 VAC (with two expansion modules [LGB6001C])  
LGB6050A: 1.6 A @ 110 VAC (without expansion modules)  
1.8 A @ 110 VAC (with two expansion modules [LGB6001C])  
0.66 A @ 240 VAC (without expansion modules)  
0.72 A @ 240 VAC (with two expansion modules [LGB6001C])  
SWITCH FEATURES  
FORWARDING MODE  
Store-and-forward  
THROUGHPUT  
Wire speed  
FLOW CONTROL  
Full-duplex: IEEE 802.3x  
Half-duplex: Back pressure  
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CHAPTER C | Specifications  
Management Features  
MANAGEMENT FEATURES  
IN-BAND MANAGEMENT  
SSH, Telnet, SNMP, or HTTP  
OUT-OF-BAND MANAGEMENT  
RS-232 DB-9 console port  
SOFTWARE LOADING  
TFTP in-band, or XModem out-of-band  
STANDARDS  
IEEE 802.3-2005  
Ethernet, Fast Ethernet, Gigabit Ethernet  
Full-duplex flow control  
IEEE 802.3ae 10 Gigabit Ethernet  
IEEE 802.1D Spanning Tree Protocol  
IEEE 802.1w Rapid Spanning Tree Protocol  
IEEE 802.1s Multiple Spanning Tree Protocol  
IEEE 802.1Q Virtual LAN  
ISO/IEC 8802-3 CSMA/CD  
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CHAPTER C | Specifications  
Compliances  
COMPLIANCES  
CE MARK  
EMISSIONS  
FCC Class A  
Industry Canada Class A  
EN55022 (CISPR 22) Class A  
EN 61000-3-2/3  
VCCI Class A  
C-Tick - AS/NZS 3548 (1995) Class A  
IMMUNITY  
EN 61000-4-2/3/4/5/6/8/11  
SAFETY  
UL 60950-1 & CSA 60950-1  
IEC 60950-1 & EN 60950-1  
10GBASE EXTENDER MODULE (SFP+)  
PORTS  
1 slot for 10GBASE SFP+ transceiver  
COMMUNICATION SPEED  
10 Gbps  
COMMUNICATION MODE  
Full duplex  
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CHAPTER C | Specifications  
10GBASE Extender Module (SFP+)  
NETWORK INTERFACE  
SFP+ slot  
STANDARDS  
IEEE 802.3ae 10 Gigabit Ethernet  
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GLOSSARY  
10BASE-T  
IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Category 3, 4, or  
5 UTP cable.  
100BASE-TX  
IEEE 802.3u specification for 100 Mbps Ethernet over two pairs of Category 5  
UTP cable.  
1000BASE-LH  
Specification for long-haul Gigabit Ethernet over two strands of 9/125 micron  
core fiber cable.  
1000BASE-LX  
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125, 62.5/  
125 or 9/125 micron core fiber cable.  
1000BASE-SX  
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or  
62.5/125 micron core fiber cable.  
1000BASE-T  
IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm Category 5, 5e or  
6 twisted-pair cable (using all four wire pairs).  
10GBASE-ER  
IEEE 802.3ae specification for 10 Gigabit Ethernet over two strands of 9/125  
micron core single-mode fiber cable.  
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GLOSSARY  
10GBASE-LR  
IEEE 802.3ae specification for 10 Gigabit Ethernet over two strands of 9/125  
micron core single-mode fiber cable.  
10GBASE-SR  
IEEE 802.3ae specification for 10 Gigabit Ethernet over two strands of 62.5/125  
micron core multimode fiber cable.  
10 GIGABIT ETHERNET  
A 10 Gbps network communication system based on Ethernet.  
AUTO-NEGOTIATION  
Signalling method allowing each node to select its optimum operational mode  
(e.g., speed and duplex mode) based on the capabilities of the node to which it  
is connected.  
BANDWIDTH  
The difference between the highest and lowest frequencies available for network  
signals. Also synonymous with wire speed, the actual speed of the data  
transmission along the cable.  
COLLISION DOMAIN  
Single CSMA/CD LAN segment.  
CSMA/CD  
CSMA/CD (Carrier Sense Multiple Access/Collision Detect) is the communication  
method employed by Ethernet, Fast Ethernet, and Gigabit Ethernet.  
END STATION  
A workstation, server, or other device that does not forward traffic.  
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GLOSSARY  
ETHERNET  
A network communication system developed and standardized by DEC, Intel,  
and Xerox, using baseband transmission, CSMA/CD access, logical bus topology,  
and coaxial cable. The successor IEEE 802.3 standard provides for integration  
into the OSI model and extends the physical layer and media with repeaters and  
implementations that operate on fiber, thin coax and twisted-pair cable.  
FAST ETHERNET  
A 100 Mbps network communication system based on Ethernet and the CSMA/  
CD access method.  
FULL-DUPLEX  
Transmission method that allows two network devices to transmit and receive  
concurrently, effectively doubling the bandwidth of that link.  
GIGABIT ETHERNET  
A 1000 Mbps network communication system based on Ethernet and the CSMA/  
CD access method.  
IEEE  
Institute of Electrical and Electronic Engineers.  
IEEE 802.3  
Defines carrier sense multiple access with collision detection (CSMA/CD) access  
method and physical layer specifications.  
IEEE 802.3AB  
Defines CSMA/CD access method and physical layer specifications for  
1000BASE-T Gigabit Ethernet. (Now incorporated in IEEE 802.3-2005.)  
IEEE 802.3AE  
Defines the physical layer specifications for 10 Gigabit Ethernet.  
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GLOSSARY  
IEEE 802.3U  
Defines CSMA/CD access method and physical layer specifications for 100BASE-  
TX Fast Ethernet. (Now incorporated in IEEE 802.3-2005.)  
IEEE 802.3Z  
Defines CSMA/CDaccess method and physical layer specificationsfor 1000BASE  
Gigabit Ethernet. (Now incorporated in IEEE 802.3-2005.)  
LAN SEGMENT  
Separate LAN or collision domain.  
LED  
Light emitting diode used for monitoring a device or network condition.  
LOCAL AREA NETWORK (LAN)  
A group of interconnected computer and support devices.  
MEDIA ACCESS CONTROL (MAC)  
A portion of the networking protocol that governs access to the transmission  
medium, facilitating the exchange of data between network nodes.  
MIB  
An acronym for Management Information Base. It is a set of database objects  
that contains information about the device.  
MODAL BANDWIDTH  
Bandwidth for multimode fiber is referred to as modal bandwidth because it  
varies with the modal field (or core diameter) of the fiber. Modal bandwidth is  
specified in units of MHz per km, which indicates the amount of bandwidth  
supported by the fiber for a one km distance.  
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GLOSSARY  
NETWORK DIAMETER  
Wire distance between two end stations in the same collision domain.  
REDUNDANT POWER SUPPLY (RPS)  
A backup power supply unit that automatically takes over in case the primary  
power supply should fail.  
RJ-45 CONNECTOR  
A connector for twisted-pair wiring.  
SWITCHED PORTS  
Ports that are on separate collision domains or LAN segments.  
TIA  
Telecommunications Industry Association  
TRANSMISSION CONTROL PROTOCOL/INTERNET PROTOCOL (TCP/IP)  
Protocol suite that includes TCP as the primary transport protocol, and IP as the  
network layer protocol.  
UTP  
Unshielded twisted-pair cable.  
VIRTUAL LAN (VLAN)  
A Virtual LAN is a collection of network nodes that share the same collision  
domain regardless of their physical location or connection point in the network.  
A VLAN serves as a logical workgroup with no physical barriers, allowing users to  
share information and resources as though located on the same LAN.  
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GLOSSARY  
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INDEX  
NUMERICS  
D
10 Gbps connectivity rules 63  
10 Mbps connectivity rules 65  
100 Mbps connectivity rules 65  
1000 Mbps connectivity rules 64  
1000BASE-LH fiber cable Lengths 64  
1000BASE-LX fiber cable Lengths 64  
1000BASE-SX fiber cable Lengths 63, 64  
1000BASE-T  
desktop mounting 46  
E
electrical interference, avoiding 41  
equipment checklist 43  
Ethernet connectivity rules 63, 65  
pin assignments 74  
100BASE-TX, cable lengths 65  
10BASE-T, cable lengths 65  
F
Fast Ethernet connectivity rules 65  
features  
80  
management 31  
A
switch 30  
adhesive feet, attaching 46  
applications  
front panel of switch 24  
central wiring closet 35  
collapsed backbone 34  
Layer 3 routing 38  
remote connections with fiber 36  
VLAN connections 37  
G
Gigabit Ethernet cable lengths 64  
grounding for racks 44  
B
I
brackets, attaching 45  
buffer size 77  
IEEE 802.3 Ethernet 30  
IEEE 802.3ae 10 Gigabit Ethernet 30  
IEEE 802.3u Fast Ethernet 30  
IEEE 802.3z Gigabit Ethernet 30  
indicators, LED 26  
C
cable  
installation  
connecting devices to the switch 56  
desktop or shelf mounting 46  
network wiring connections 57  
port connections 55, 58  
power requirements 41  
problems 69  
Ethernet cable compatibility 42  
fiber standards 75  
labeling and connection records 65  
lengths 63, 65  
cleaning fiber terminators 59, 61  
compliances  
rack mounting 44  
site requirements 41  
EMC 81  
safety 81  
connectivity rules  
10 Gbps 63  
L
10 Mbps 65  
100 Mbps 65  
1000 Mbps 64  
console port, pin assignments 52  
contents of package 43  
cooling problems 69  
cord sets, international 51  
laser safety 59, 61  
LC port connections 58, 61  
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INDEX  
specifications  
LED indicators  
DIAG 27  
compliances 81  
environmental 78  
power 79  
standards  
compliance 81  
IEEE  
status LEDs 26  
switch architecture 24  
Module 28  
PWR 27  
Stack ID 28  
Stack Link 28  
Stack Master 27  
location requirements 41  
80  
M
T
management  
agent 25  
Telnet 69  
features  
31, 80  
temperature within a rack 44  
troubleshooting  
SNMP 25  
in-band access 69  
mounting the switch  
in a rack 44  
power and cooling problems 69  
twisted-pair connections 55  
on a desktop or shelf 46  
N
network  
V
VLANs  
routing 38  
VLANS, tagging 37  
connections 55, 58  
examples 34  
O
optional modules, installation 47  
P
package contents 43  
pin assignments 71  
1000BASE-T  
74  
10BASE-T/100BASE-TX 72  
console port 52  
ports, connecting to 55, 58  
power, connecting to 51  
R
rack mounting 44  
rear panel of switch 24  
RJ-45 port  
connections 55  
pinouts 74  
rubber foot pads, attaching 46  
S
screws for rack mounting 43  
SFP transceiver slots 25  
site selelction 41  
SNMP agent 25  
–
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LGB6026A, version 1  
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