3Com Switch 3C16895 User Manual

Switch 7750  
Installation Guide  
3C16895 7-slot Chassis  
3C16894 4-slot Chassis  
and associated modules  
Part No. 10014824  
Published June 2005  
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ABOUT THIS GUIDE  
This guide describes the 3Com® Switch 7750 and how to install hardware,  
configure and boot software, and maintain software and hardware. This guide  
also provides troubleshooting and support information for your switch.  
This guide is intended for qualified Service personnel who are responsible for  
configuring, using, and managing the switches. It assumes a working knowledge  
of local area network (LAN) operations and familiarity with communication  
protocols that are used to interconnect LANs.  
Always download the Release Notes for your product from the 3Com World Wide  
Web site and check for the latest updates to software and product  
documentation:  
Conventions  
Table 1 lists icon conventions that are used throughout this guide.  
Table 1 Notice Icons  
Icon  
Notice Type  
Description  
Information note  
Information that describes important features or  
instructions.  
Caution  
Warning  
Information that alerts you to potential loss of data  
or potential damage to an application, system, or  
device.  
Information that alerts you to potential personal  
injury.  
Table 2 lists text conventions that are used throughout this guide.  
Table 2 Text Conventions  
Convention  
Description  
Screen displays  
This typeface represents information as it appears on the  
screen.  
Keyboard key names  
If you must press two or more keys simultaneously, the key  
names are linked with a plus sign (+), for example:  
Press Ctrl+Alt+Del  
The words “enter” and “type” When you see the word “enter” in this guide, you must type  
something, and then press Return or Enter. Do not press  
Return or Enter when an instruction simply says “type.”  
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8
ABOUT THIS GUIDE  
Table 2 Text Conventions  
Convention  
Description  
Words in italics  
Italics are used to:  
Emphasize a point.  
Denote a new term at the place where it is defined in the  
text.  
Identify menu names, menu commands, and software  
button names.  
Examples:  
From the Help menu, select Contents.  
Click OK.  
Words in bold  
Boldface type is used to highlight command names. For  
example, “Use the display user-interfacecommand  
to...”  
Related  
Documentation  
The following manuals offer additional information necessary for managing your  
Switch 7750:  
Switch 7750 Command Reference Guide — Provides detailed descriptions of  
command line interface (CLI) commands, that you require to manage your  
Switch 7750.  
Switch 7750 Configuration Guide— Describes how to configure your Switch  
7750 using the supported protocols and CLI commands.  
Switch 7750 Release Notes — Contains the latest information about your  
product. If information in this guide differs from information in the release  
notes, use the information in the Release Notes.  
These documents are available in Adobe Acrobat Reader Portable Document  
Format (PDF) on the CD-ROM that accompanies your router or on the 3Com  
World Wide Web site:  
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SWITCH 7750 COMPONENTS  
1
The chapter describes the following Switch 7750 components:  
Switch Chassis  
The Switch 7750 is available with a 4-Slot or 7-Slot chassis. Table 3 lists the  
hardware features of each model.  
Table 3 Hardware Features of the Switch 7750 Models  
4-Slot Chassis  
7-Slot Chassis  
Fabric slots  
1
3
1
2
1
6
1
3
I/O module slots  
Fan slot  
AC Power module slots  
Switch Backplane  
The Switch 7750 backplane is part of the integrated chassis and delivers  
high-speed data transfer between the Fabric and I/O modules. The backplane  
bandwidth capacity is 96 Gbps.  
The backplane supports the following functions:  
Interconnection of signals between modules  
Provides communication channels  
Hot swapping for modules  
Automatic recognition of slots  
Distribution of power and management of the power supply for the system  
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10  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Fabric Module  
There are two Fabric modules for the Switch 7750:  
Fabric 64 (3C16857 or 3C16857R)  
Fabric 32 (3C16872)  
PoE Fabric 96 (3C16886)  
The Fabric 64 and Fabric 32 are not interchangeable. You can install the Fabric 32  
only in a 4-slot chassis. You can install the Fabric 64 only in the 7-slot chassis. You  
can install the PoE Fabric 96 in both chassis.  
The Fabric module is the core of Switch 7750 system. It has the following  
functions:  
Connects the I/O modules through the backplane and forwards Layer 2 and  
Layer 3 data  
Manages and calculates routing  
Performs the switchs software upgrade and system reset functions  
Monitors system power and the fan frame  
Figure 1 illustrates the front panel of the PoE Fabric 96.  
Figure 1 PoE Fabric 96  
3C16886  
1
2
3
8
4 5 6  
9
7
1 Compact Flash port  
2 1000BASE-X-SFP ports  
3 Console port  
4 Ethernet port  
5 Ethernet port LEDs  
6 Fan LEDs  
7 Power LEDs  
8 I/O module LEDs  
9 Reset button  
Figure 2 illustrates the front panel of the Fabric 64.  
Figure 2 Fabric 64  
3C16857  
5 6  
7
1
2
3
4
1 Reset button  
2 Console port  
3 Ethernet port  
4 Ethernet port LEDs  
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Fabric Module  
11  
5 Fan LEDs  
6 Power module LEDs  
7 I/O module LEDs  
Figure 3 illustrates the front panel of the Fabric 32.  
Figure 3 Fabric 32  
3C16872  
1
2
3
4 5 6  
7
8
1 Submodule slot  
2 Console port  
3 Ethernet port  
4 Ethernet port LEDs  
5 Fan LEDs  
6 Power LEDs  
7 I/O module LEDs  
8 Reset button  
Table 4 lists Fabric specifications.  
Table 4 Fabric Specifications  
PoE Fabric 96  
Fabric 64 (3C16857  
or 3C16857R)  
Item  
(3C16886)  
96 Gbps  
MPC8245  
512 KB  
Fabric 32 (3C16872)  
Bandwidth  
CPU  
64 Gbps  
32 Gbps  
MPC8260 200 Mhz  
1 MB  
BootROM  
SDRAM  
256 M  
256 MB  
Flash  
32 MB  
16 MB  
Submodule slot  
Dimensions (L x W)  
1
366.7 mm x 340 mm (14.5 x 13.5 in)  
External ports  
One console port that supports local and remote dial-up configuration  
management of the switch.  
One 10BASE-T/100BASE-TX port for upgrade and network  
management  
One Compact Flash  
port for storing log  
and host version and  
for online software  
upgrades  
Four 1000BASE-X-SFP  
ports  
Maximum power  
consumption  
80 W  
80 W  
70 W (with  
submodule)  
Submodule Slot The submodule slot in the Fabric 32 offers extended Ethernet capacity using the  
following submodules:  
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12  
CHAPTER 1: SWITCH 7750 COMPONENTS  
4-port 1000BASE-X-GBIC submodule  
4-port 10/100/1000BASE-T submodule  
For more information on these submodules, see “Fabric 32 Submodules”on  
Fixed Ports The Switch 7750 Fabric modules provide the following fixed ports:  
1000BASE-X-SFP (PoE Fabric 96 only)  
Compact Flash (CF) Port  
The Fabric module provides a CF port to accommodate a standard CF card, where  
you can save logging information, host version information, alarming and other  
diagnostic information. You can also use the CF port to upgrade software online.  
1000BASE-X-SFP Ports  
The PoE Fabric 96 provides four 1000 Mbps full-duplex SFP ports. Table 5 describes  
the SFP cables for these ports.  
Table 5 Cables for 1000BASE-T-SFP Modules  
Maximum  
Central  
Wavelength  
transmission  
SFP Module  
Connector Matching Cable distance  
1000BASE-SX-SFP  
850 nm  
LC  
50/125 µm  
multimode  
optical fiber  
cable  
550 m (1804 ft.)  
62/125 µm  
multimode  
optical fiber  
cable  
275 m (902 ft.)  
1000BASE-LX-SFP  
1000BASE-LH-SFP  
1310 nm  
9/125 µm single 10 km (6 mi.)  
mode optical  
30 km (19 mi.)  
fiber cable  
1000BASE-ZX-LR-SFP 1550 nm  
1000BASE-ZX-VR-SFP  
40 km (25 mi.)  
70 km (43 mi.)  
100 m (328 ft.)  
1000BASE-T-FD-SFP  
RJ-45  
Table 9 describes the LEDs of the SFP ports.  
Table 6 SFP Port LEDs  
LED  
Description  
LINK/ACT  
Off — The line is not connected.  
Green — The line is connected.  
Green flashing — Data is being transmitted.  
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Fabric Module  
13  
Console Port  
The console port is connected to the configuration terminal using an RJ-45  
connector. You can use the console port for system debugging, configuration,  
maintenance, management, and loading application files.  
The console port can also be connected to a modem for functions such as remote  
system debugging, configuration, maintenance, and management. You can  
configure the baud rate on the console port.  
Table 7 lists console port specifications.  
Table 7 Console Port Specifications  
Specification  
Port connector  
Port standard  
Baud rate  
Description  
RJ-45  
Asynchronous EIA/TIA-232  
9600 bps (by default)  
15 m (45 ft)  
Transmission distance  
Services  
Connects with character terminal  
Connects with local or remote PC serial port and runs terminal  
emulation on a PC (a pair of modems are required for a  
remote connection)  
Ethernet Port  
The Ethernet port on the Fabric is connected to a computer using an RJ-45  
connector. You can use the Ethernet port for system application downloading and  
debugging. The Ethernet port can also be connected to devices such as a network  
management workstation to manage the system remotely.  
Table 8 lists Ethernet port specifications.  
Table 8 Ethernet Port Specifications  
Specification  
Port connector  
Number of port(s)  
Port speed  
Description  
RJ-45  
1
10 Mbps, half/full duplex  
100 Mbps, half/full duplex  
MDI/MDIX auto sensing  
Cable and maximum transmission Category-5 twisted pair for transmission within 100 m  
distance  
(328 ft)  
Port function  
Switch software upgrade and network management  
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45  
connector and MDI/MDI-X pinout details.  
Table 9 describes the LEDs of the Ethernet port.  
Table 9 Ethernet Port LEDs  
LED  
Description  
LINK  
Off — The line is not connected.  
Green — The line is connected.  
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14  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 9 Ethernet Port LEDs (continued)  
LED  
Description  
ACTIVE  
Green — No data is being transmitted.  
Green flashing — Data is being transmitted.  
Module LEDs The module LEDs show the status of the I/O modules, as described in Table 10.  
Table 10 I/O Module LEDs  
LED  
Status description  
RUN  
Green or off — The module failed or has not been inserted.  
Green flashing — The module is working normally.  
ALM  
Off — The module is working normally or has not been  
inserted.  
Green or green flashing — The module failed or is not  
working normally.  
Power LEDs PWR1, PWR2, and PWR3 LEDs show the status of the power modules, as  
described in Table 11.  
Table 11 Power LEDs  
LED  
Description  
OK  
Green — The corresponding power module is working  
normally.  
Off — The corresponding power module is not working or  
has not been installed.  
FAIL  
Green — The corresponding power module is not working.  
Off — The corresponding power module works normally or  
has not been installed.  
Fan LED Fan LEDs show the status of the fan frame, as described in Table 12.  
Table 12 Fan LEDs  
LED  
Description  
OK  
Green — The fan is working normally.  
Off — The fan is not working or has not been installed.  
FAIL  
Green — The fan is not working.  
Off — The fan is working normally or has not been installed.  
Reset Button The reset button resets the entire system.  
Fabric 32 Submodules  
The Fabric 32 provides a slot for one submodule. The Fabric 32 supports the  
following submodules:  
4-Port 1000BASE-X-GBIC The 4-port 1000BASE-X-GBIC submodule provides four GE full-duplex Ethernet  
Submodule GBIC ports.  
Figure 4 illustrates the 4-port 1000BASE-X-GBIC submodule.  
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Fabric 32 Submodules  
15  
Figure 4 4-Port 1000BASE-X-GBIC Submodule  
3C16874  
1
2
Ethernet GBIC port  
2 Ethernet GBIC port LED  
Table 13 describes the 4-port 1000BASE-X-GBIC submodule LEDs.  
Table 13 4-Port 1000BASE-X-GBIC Submodule LEDs  
LED  
Description  
LINK/ACT  
Green — The link is operating normally.  
Off — The link is not operating.  
Green flashing — Data is being transmitted.  
Table 14 lists the specifications for each of the 4-port 1000BASE-X-GBIC  
submodule.  
Table 14 4-Port 1000BASE-X-GBIC Submodule Specifications  
Max.  
Optional GBIC  
Module  
Central  
Connector Interface Fiber  
Transmission  
Wavelength Type  
Specifications  
Distance  
1000BASE-SX-MM  
(3CGBIC91)  
850 nm  
SC  
50/125 µm  
multi-mode fiber  
62.5/125 µm  
500 m (1640 ft)  
220 m (722 ft)  
Multi-mode fiber  
1000BASE-LX-SM-IR 1310 nm  
(3CGBIC92)  
SC  
SC  
9/125 µm  
Single-mode fiber  
10 km (6 mi)  
1000BASE-LX-SM  
(3CGBIC97)  
1550 nm  
9/125 µm  
Single-mode fiber  
40 km (25 mi)  
70 km (43.5 mi)  
4-Port The 4-Port 10/100/1000BASE-T submodule provides four 10/100/1000 Mbps  
10/100/1000BASE-T auto-negotiation service ports.  
Submodule  
Figure 5 illustrates the 4-port 10/100/1000BASE-T submodule.  
Figure 5 4-Port 10/100/1000BASE-T Submodule  
3C16873  
1
2
1 Ethernet port  
2 Ethernet port LEDs  
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16  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 15 describes the 4-port 10/100/1000BASE-T submodule LEDs.  
Table 15 4-Port 10/100/1000BASE-T Submodule LEDs  
LED  
Description  
LINK  
Off — The link is not operating.  
On — The link is operating normally.  
ACT  
Off — No data is being transmitted.  
Green flashing — Data is being transmitted.  
Table 16 lists specifications of the 4-port 10/100/1000BASE-T submodule.  
Table 16 4-Port 10/100/1000BASE-T Submodule Specifications  
Specification  
Connector type  
Number of ports  
Port speed  
Description  
RJ-45  
4
1000 Mbps full duplex  
100 Mbps half/full duplex  
10 Mbps half/full duplex  
MDI/MDI-X auto-sensing  
Cable and maximum  
transmission distance  
Category 5 twisted pair up to 100 m (328 ft)  
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45  
connector and MDI/MDI-X pinout details.  
I/O Modules  
The Switch 7750 provides multiple slots for I/O modules below the Fabric slots.  
The following I/O modules are supported:  
Consider the following when selecting I/O modules:  
You can configure several I/O modules of the same type  
Any combination of I/O modules can be inserted but only PoE I/O modules  
provide the features of power over Ethernet.  
You must select I/O module port cables that are compatible with each installed  
I/O module  
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I/O Modules  
17  
48-port 10/100BASE-T FE The 48-port 10/100BASE-T FE PoE module provides 48 10/100 Mbps auto-sensing  
PoE Module Ethernet ports that provide a remote power supply to powered devices  
Figure 12illustrates the 48-port 10/100BASE-T FE PoE module.  
Figure 6 48-port 10/100BASE-T FE PoE Module  
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100BASE-T FE PoE  
module.  
Figure 7 Front Panel of the 48-port 10/100BASE-T FE PoE Module  
3C16891  
2
1
1 Ethernet port  
2 Ethernet port LED  
Table 23 describes the 48-port 10/100BASE-T FE PoE Module LEDs.  
Table 17 module LED  
LED  
Description  
LINK/ACT  
Green — The port is connected  
Off — The port is not connected  
Green flashing — Data is being transmitted  
Table 24 describes the specifications for the 48-port 10/100BASE-T FE PoE module.  
Table 18 Specifications for the 48-port 10/100BASE-T FE PoE Module  
Specification  
CPU  
Description  
MPC8241  
BootROM  
512 KB  
SDRAM  
128 M  
Dimensions (L X W)  
366.7 x 340 mm (14.4 x 13.4 in.)  
Maximum power consumption 35 W  
Connector  
RJ-45  
Number of ports  
Port transmission speed  
48  
10/100 Mbps half-/full-duplex MDI/MDI-X auto-sensing  
100 m (328 ft.)  
Cables and maximum  
transmission distance  
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18  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 18 Specifications for the 48-port 10/100BASE-T FE PoE Module (continued)  
Specification  
Description  
Maximum power each port  
provides  
15.4 W  
Compliance  
IEEE802.3  
IEEE802.3u  
IEEE802.3x  
IEEE802.3ad  
IEEE802.1p  
IEEE802.1D  
IEEE802.1Q  
IEEE802.1X  
IEEE802.1s  
IEEE802.1w  
IEEE802.3af  
48-port The 48-port 10/100/1000BASE-T PoE module provides 48 10/100/1000 Mbps  
10/100/1000BASE-T PoE auto-sensing Ethernet ports that provide a remote power supply to powered  
Module devices.  
Figure 12illustrates the 48-port 10/100/1000BASE-T PoE module.  
Figure 8 48-port 10/100/1000BASE-T PoE Module  
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100/1000BASE-T  
PoE module.  
Figure 9 Front Panel of the 48-port 10/100/1000BASE-T PoE Module  
3C16890  
1
2
1 Ethernet port  
2 Ethernet port LED  
Table 23 describes the 48-port 10/100/1000BASE-T PoE module LEDs.  
Table 19 48-port 10/100/1000BASE-T PoE Module LED  
LED  
Description  
LINK/ACT  
Green — The port is connected  
Off — The port is not connected  
Green flashing — Data is being transmitted  
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I/O Modules  
19  
Table 24 describes the specifications of the 48-port 10/100/1000BASE-T PoE  
module.  
Table 20 Specifications for the 48-port 10/100/1000BASE-T PoE Module  
Specification  
CPU  
Description  
MPC8241  
BootROM  
512 KB  
SDRAM  
128 M  
Dimensions (L X W)  
366.7 x 340 mm (14.4 x 13.4 in.)  
Maximum power consumption 70 W  
Connector  
RJ-45  
48  
Number of ports  
Port transmission speed  
10/100/1000 Mbps half-/full-duplex  
MDI/MDIX auto-sensing  
Cables and maximum  
transmission distance  
Category 5 twisted pair with a maximum distance of 100 m  
(328 ft.)  
Compliance  
IEEE802.3ab  
IEEE802.3  
IEEE802.3i  
IEEE802.3x  
IEEE802.1p  
IEEE802.1D  
IEEE802.1Q  
IEEE802.1X  
IEEE802.1s  
IEEE802.1w  
48-port 10/100BASE-T The 48-port 10/100BASE-T Auto-sensing FE module provides 48 external  
Auto-sensing FE Module 100Mbps Ethernet electrical ports.  
Figure 10 illustrates the 48-port 10/100BASE-T Auto-sensing FE module.  
Figure 10 48-port 10/100BASE-T Auto-sensing FE Module  
Figure 11 illustrates the front panel and LEDs of the 48-port 10/100BASE-T  
Auto-sensing FE module.  
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20  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Figure 11 Front Panel of the 48-Port 10/100BASE-T Auto-sensing FE module  
1
2
1 Ethernet port  
2 Ethernet port LED  
Each 100 Mbps Ethernet port has a green LED, indicating LINK/ACTIVE status.  
Table 21 describes the 48-port 10/100BASE-T Auto-sensing FE module LED.  
Table 21 48-Port 10/100BASE-T Auto-sensing FE module LED  
LED  
Description  
LINK/ACT  
Green — The port is connected  
Off — The port is not connected  
Green flashing — Data is being transmitted  
Table 22 describes the specifications of the 48-port 10/100BASE-T Auto-sensing FE  
module.  
Table 22 Specifications for the 48-Port 10/100BASE-T Auto-sensing FE Module  
Specification  
CPU  
Description  
MPC850  
BootROM  
512 KB  
SDRAM  
64 MB  
Dimensions (L X W)  
366.7 x 340 mm (14.5 x 13.4 in)  
55 W  
Maximum power  
consumption  
Connector  
RJ-45  
48  
Number of ports  
Port transmission  
speed  
10 Mbps half/full duplex  
100 Mbps half/full duplex  
MDI/MDIX auto-sensing  
Cables and maximum Cables are 2 100-ohm Category-5 twisted pairs up to 100 m (300 ft).  
transmission distance  
Compliance  
IEEE802.3  
IEEE802.3u  
IEEE802.3x  
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45  
connector and MDI/MDI-X pinout details.  
48-port The 48-port 10/100/1000BASE-T module provides 48 10/100/1000 Mbps  
10/100/1000BASE-T auto-sensing Ethernet electrical ports.  
Module  
Figure 12 illustrates the 48-port 10/100/1000BASE-T module.  
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I/O Modules  
21  
Figure 12 48-port 10/100/1000BASE-T Module  
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100/1000BASE-T  
module.  
Figure 13 Front Panel of the 48-port 10/100/1000BASE-T Module  
3C16888  
1 2  
1 Ethernet port  
2 Ethernet port LED  
Table 23 describes the 48-port 10/100/1000BASE-T module LEDs.  
Table 23 48-port 10/100/1000BASE-T Module LED  
LED  
Description  
LINK/ACT  
Green — The port is connected  
Off — The port is not connected  
Green flashing — Data is being transmitted  
Table 24 describes the specifications of the 48-port 10/100/1000BASE-T module.  
Table 24 Specifications for the 48-port 10/100/1000BASE-T Module  
Specification  
CPU  
Description  
MPC8241  
BootROM  
512 KB  
SDRAM  
128 M  
Dimensions (L X W)  
366.7 x 340 mm (14.4 x 13.4 in.)  
Maximum power consumption 70 W  
Connector  
RJ-45  
48  
Number of ports  
Port transmission speed  
10/100/1000 Mbps half-/full-duplex MDI/MDI-X  
auto-sensing  
Cables and maximum  
transmission distance  
Category 5 twisted pair with a maximum transmission  
distance of 100 m (328 ft.)  
Compliance  
1EEE 802.3ab  
1EEE 802.3  
1EEE 802.3u  
1EEE 802.3x  
1EEE 802.1p  
1EEE 802.1D  
1EEE 802.1Q  
1EEE 802.1X  
1EEE 802.1s  
1EEE 802.1w  
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22  
CHAPTER 1: SWITCH 7750 COMPONENTS  
24-port 100BASE-FX The 24-port 100BASE-FX MMF FE module provides 24 100 Mbps multi-mode  
MMF FE Module Ethernet optical port service channels.  
Figure 14 illustrates the 24-port 100BASE-FX MMF FE module.  
Figure 14 24-Port 100BASE-FX MMF FE Module  
Each 100 Mbps optical port has a green LED, as shown in Figure 15.  
Figure 15 Front Panel of the 24-Port 100BASE-FX MMF FE Module  
1
2
1 Ethernet port  
2 Ethernet port LED  
Table 25 describes the status of the 24-port 100BASE-FX MMF FE module LEDs.  
Table 25 24-Port 100BASE-FX MMF FE Module LEDs  
LED  
Description  
LINK/ACT  
Green — The port is connected.  
Off — The port is not connected.  
Green flashing — Data is being transmitted or received.  
The 24-port 100BASE-FX MMF FE module requires a 62.5/125 µm multi-mode  
optical fiber cable with an MT-RJ connector and a central wavelength of 1300 nm.  
Table 26 describes the specifications of the 24-port 100BASE-FX MMF FE module.  
Table 26 Specifications for the 24-Port 100BASE-FX MMF FE Module  
Specification  
CPU  
Description  
MPC850  
BootROM  
512 KB  
SDRAM  
64 MB  
Dimensions (L x W)  
366.7 x 340 mm (14.5 x 13.4 in)  
55 W  
Maximum power  
consumption  
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I/O Modules  
23  
Table 26 Specifications for the 24-Port 100BASE-FX MMF FE Module (continued)  
Specification  
Description  
Connector type  
MT-RJ  
Number of ports  
Port transmission speed  
24  
100 Mbps, full-duplex  
Cables and maximum  
transmission distance  
62.5/125 µm multi-mode optical fiber up to 2 km (1.3 mi)  
Compliance  
IEEE 802.3  
IEEE 802.3i  
IEEE 802.3u  
IEEE 802.3x  
20-Port The 20-Port 10/100/1000BASE-T module provides 20 10/100/1000BASE-T  
10/100/1000BASE-T auto-sensing Ethernet ports.  
Module  
Figure 16 illustrates the 20-Port 10/100/1000BASE-T Module.  
Figure 16 20-Port 10/100/1000BASE-T Module  
Figure 17 illustrates the front panel of the 20-port 10/100/1000BASE-T module.  
Figure 17 Front Panel of the 20-Port 10/100/1000BASE-T Module  
3C16863  
1
2
1 Ethernet port  
2 Ethernet port LED  
Table 27 describes the 20-port 10/100/1000BASE-T module LEDs.  
Table 27 20-Port 10/100/1000BASE-T Module LEDs  
LED  
Description  
LINK/ACT  
Off — The port is not operating.  
On — The port is operating.  
Green flashing — The port is transmitting data  
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24  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 28 lists specifications of the 20-port 10/100/1000BASE-T module.  
Table 28 Specifications for the 20-Port 10/100/1000BASE-T Module  
Specification  
CPU  
Description  
MPC8241LZU200  
BootROM  
512 KB  
SDRAM  
64 MB  
Dimensions (L x W)  
Power consumption  
Connector  
366.7 x 340 mm (14.5 x 13.4 in)  
45 W  
RJ-45  
20  
Number of ports  
Transmission rate  
10 Mbps half/full duplex  
100 Mbps half/full duplex  
1000 Mbps full duplex  
Cable and maximum  
transmission distance  
Category-5 twisted pair  
100 m (300 ft)  
Compliance  
IEEE 802.3ab  
IEEE 802.3  
IEEE 802.3u  
IEEE 802.3x  
IEEE 802.1D  
IEEE 802.1Q  
20-Port 1000BASE-X-SFP The 20-port 1000BASE-X-SFP module provides 20 1000 BASE-X full duplex ports  
Module and uses an SFP cable.  
Figure 18 illustrates the 20-port 1000BASE-X-SFP module.  
Figure 18 20-Port 1000BASE-X-SFP Module  
Figure 19 illustrates the front panel of the 20-port 1000BASE-X-SFP module.  
Figure 19 Front Panel of the 20-Port 1000BASE-X-SFP Module  
3C16862  
1
2
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I/O Modules  
25  
1 Ethernet port  
2 Ethernet port LED  
Table 29 describes the 20-port 1000BASE-X-SFP module LEDs.  
Table 29 20-Port 1000BASE-X-SFP Module LEDs  
LED  
Description  
LINK/ACT  
Off — The port is not operating.  
On — The port is operating.  
Green flashing — The port is transmitting data  
Table 30 lists specifications of the 20-port 1000BASE-X-SFP module.  
Table 30 Specifications for the 20-Port 1000BASE-X-SFP Module  
Specification  
CPU  
Description  
MPC8241LZU200  
BootROM  
512 KB  
SDRAM  
64 MB  
Dimensions (L x W)  
Power consumption  
Connector  
366.7 x 340 mm (14.5 x 13.4 in)  
35 W  
SFP socket  
Number of ports  
Transmission rate  
20  
1000 Mbps full duplex  
Cable and maximum  
transmission distance  
1000BASE-SX-SFP (multi-mode optical fiber, short haul)  
1000BASE-LX-SFP (single mode optical fiber, 1310 nm)  
1000BASE-LH-SFP (single mode optical fiber, 1310 nm)  
1000BASE-ZX-LR-SFP (single mode optical fiber, 1550 nm)  
1000BASE-ZX-VR-SFP (single mode optical fiber, 1550 nm)  
Compliance  
IEEE 802.3z  
IEEE 802.1p  
IEEE 802.1Q  
IEEE 802.1D  
IEEE 802.3x  
IEEE 802.3ad  
8-port 1000BASE-X GBIC The 8-port 1000BASE-X GBIC module provides 8 external GBIC module ports. A  
Module GBIC module is used for each data receiving/transmitting channel. The following  
modules are available:  
3CGBIC91  
3CGBIC92  
3CGBIC97  
Figure 20 illustrates the 8-port 1000BASE-X GBIC module.  
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26  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Figure 20 8-Port 1000BASE-X GBIC Module  
3C16858  
Every GBIC port has a LED, as shown in Figure 21.  
Figure 21 Front Panel of the 8-Port 1000BASE-X GBIC Module  
1
2
1 GBIC port  
2 GBIC port LED  
Table 31 describes the 8-Port 1000BASE-X GBIC module LEDs.  
Table 31 8-Port 1000BASE-X GBIC Module LEDs  
LED  
Description  
LINK  
Off — The link is not connected  
Green — The link is connected  
ACT  
Off — No data is being transmitted  
Green flashing — Data is being transmitted or received  
The cables for each of the supported 8GBIC modules are described inTable 32.  
Table 32 GBIC Module Port Cables  
GBIC Module Type  
3CGBIC91  
Central Wave Length  
850 nm  
3CGBIC92  
1550 nm  
3CGBIC97  
1550 nm  
Table 33 describes the specifications of the 8-port 1000BASE-X GBIC module.  
Table 33 Specifications for the 8-Port 1000BASE-X GBIC Module  
Specification  
Description  
CPU  
MPC850  
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I/O Modules  
27  
Table 33 Specifications for the 8-Port 1000BASE-X GBIC Module (continued)  
Specification  
BootROM  
Description  
512 KB  
SDRAM  
64 MB  
Dimensions (L x W)  
366.7 x 340 mm (14.5 x 13.4 in)  
50 W  
Maximum power  
consumption  
Number of ports  
8
Optional GBIC module  
types  
3CGBIC 91  
3CGBIC 92  
3CGBIC 97  
Port transmission speed  
Compliance  
1000 Mbps, full duplex  
IEEE 802.3z  
IEEE 802.3x  
8-port The 8-port 10/100/1000BASE-T GE module provides 8 external 10/100/1000  
10/100/1000BASE-T GE Mbps auto-sensing Ethernet electrical ports.  
Module  
Figure 22 illustrates the 8-port 10/100/1000BASE-T GE module.  
Figure 22 8-Port 10/100/1000BASE-T GE Module  
Each port on the 8-port 10/100/1000BASE-T GE module has 2 LEDs, as shown in  
Figure 23 Front Panel of the 8-Port 10/100/1000BASE-T GE Module  
1 2  
1 Ethernet port  
2 Ethernet port LEDs  
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28  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 34 describes the LEDs on the 8-port 10/100/1000BASE-T GE module.  
Table 34 8-Port 10/100/1000BASE-T GE Module LEDs  
LED  
Description  
LINK  
Off — The link is not connected  
Green — The link is connected  
ACT  
Off — No data is being transmitted  
Green flashing — Data is being transmitted or received  
Specifications of the 8-port 10/100/1000BASE-T GE module are described in  
Table 35 Specifications for the 8-Port 10/100/1000BASE-T GE Module  
Specification  
CPU  
Description  
MPC850  
BootROM  
512 Kb  
SDRAM  
64 MB  
Dimensions (L x W)  
366.7 x 340 mm (14.5 x 13.4 in)  
Maximum power consumption 50 W  
Connector type  
RJ-45  
8
Number of ports  
Port transmission speed  
10 Mbps, half/full duplex  
100 Mbps, half/full duplex  
1000 Mbps, full duplex  
Cables and maximum  
transmission distance  
4 100-ohm Category-5 non-shielded twisted pairs up to 100  
m (300 ft).  
Compliance  
IEEE 802.3ab  
IEEE802.3  
IEEE802.3u  
IEEE802.3x  
1-Port The 1-port 10GBASE-R-XENPAK module provides a single 10 Gbps XENPAK  
10GBASE-R-XENPAK interface.  
Module  
Figure 24 illustrates the 1-port 10GBASE-R-XENPAK module.  
Figure 24 1-Port 10GBASE-R-XENPAK Module  
Figure 25 illustrates the front panel of the 1-port 10GBASE-R-XENPAK module.  
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Power Module  
29  
Figure 25 Front Panel of the 1-Port 10GBASE-R-XENPAK Module  
3C16875  
1
2
1 XENPAK port  
2 XENPAK port LEDs  
Table 36 describes the 1-port 10GBASE-R-XENPAK module LEDs.  
Table 36 1-Port 10GBASE-R-XENPAK Module LEDs  
LED  
Description  
LINK  
On — The port is operating  
Off — The port is not operating  
Off — No data is being transmitted  
Green flashing — Data is being transmitted  
ACT  
Table 37 lists specifications of the 1-port 10GBASE-R-XENPAK module.  
Table 37 Specifications for the 1-Port 10GBASE-R-XENPAK Module  
Specification  
CPU  
Description  
MPC8245  
BootROM  
512 KB  
SDRAM  
64 MB  
Dimensions (L x W)  
Power consumption  
Connector  
366.7 x 340 mm (14.5 x 13.4 in)  
35 W  
SC  
Number of ports  
Transmission rate  
1
10 Gbps full duplex  
Cable and maximum  
transmission distance  
10GBASE-LR-XENPAK (single mode optical fiber, 1310 nm 10 km)  
10GBASE-ER-XENPAK (single mode optical fiber, 1550 nm 40 km)  
Compliance  
IEEE 802.1p  
IEEE 802.1Q  
IEEE 802.1D  
IEEE 802.3  
IEEE 802.3u  
IEEE 802.3x  
IEEE 802.3ad  
IEEE 802.3ae  
Power Module  
Only one AC power module is required for the 4-slot chassis, although two power  
module slots are provided to implement N+1 redundancy.  
The 7-slot chassis provides three power module slots to implement N+1  
redundancy. However, two power modules are sufficient to power one of these  
fully loaded Switch 7750 systems.  
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30  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Table 38 describes the specifications of the Switch 7750 power module.  
Table 38 Specifications for Switch 7750 Power Modules  
Specification  
Input  
AC Power Module  
100 V to 240 V, 47 to 63 Hz, 6 A  
350 W  
Maximum output  
Power Distribution  
The Switch 7750 power distribution box is installed on the chassis floor in the back  
of the chassis. It filters, connects, disconnects and distributes electrical current to  
the switch.  
The power distribution box for the 4-slot chassis has two inputs and each input  
has a separate ON/OFF switch. One input can support the normal operation of one  
power module. Both AC inputs must be connected and switched on to provide  
power to both power modules and to offer N+1 AC power redundancy. When  
two power modules are installed but only one AC power input is working, only  
one power module will operate. However, the Power Module LEDs on the Fabric  
display alarm information for the power module that is not working.  
The power distribution box for the 7-slot chassis has two inputs and two ON/OFF  
switches. One input can support the normal operation of three AC power modules  
at the same time. When both AC power inputs are connected and switched on,  
the power distribution box offers N+1 AC power redundancy.  
External PoE Power  
System  
The Switch 7750 supports power-over-Ethernet (PoE). When the Switch 7750 is  
equipped with an external PoE power system and PoE-capable I/O modules, it can  
provide -48 V DC power to remote powered devices (PDs), such as IP phones,  
WLAN APs, and network cameras through twisted pair cable.  
Figure 26 illustrates the Switch 7750 PoE power system.  
Figure 26 Switch 7750 PoE Power Supply  
The Switch 7750 supports PoE external input power up to 2400 W.  
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Fan Assembly  
31  
Table 39 describes the capabilities of the Switch 7750 PoE power module.  
Table 39 PoE Power Modules  
Power supplied  
Power modules  
needed for  
Input voltage  
100 to 140 V  
200 to 240 V  
1 Power module  
2 Power module  
2400 W  
redundancy  
1200 W  
2400 W  
3
2
The Switch 7750 provides power through Ethernet ports on the PoE-supported I/O  
modules, supporting the maximum distance of 100 m (328 ft.).  
When the Switch 7750 provides power remotely, each Ethernet port can provide  
up to 15.4 W of power to the connected PD.  
Fan Assembly  
The fan assembly consists of two to four individual fans and is located on the right  
side of the chassis:  
4-slot chassis — 3C16871  
7-slot chassis — 3C16856  
The fans are directly connected to the backplane through connectors. Fan  
operation fault signals are collected and transmitted to the system alarm board  
through the backplane.  
Figure 27 illustrates the fan assembly for the 7-slot chassis.  
Figure 27 Fan Assembly  
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32  
CHAPTER 1: SWITCH 7750 COMPONENTS  
Switch 7750  
Specifications  
Table 40 provides detailed information about features of the Switch 7750.  
Table 40 Specifications for the Switch 7750 System  
Item  
4-Slot Chassis  
7-Slot Chassis  
Dimensions  
(W x H x D)  
436 x 352.8 x 480 mm  
(17 x 14 x 19 in)  
436 x 486.2 x 480 mm  
(17 x 19 x 19 in)  
Weight (with all  
components)  
50 Kg (110 lbs)  
70 Kg (154 lbs)  
Fabric slots  
1
3
1
6
I/O module slots  
Fabric submodule options  
4-port 1000BASE-X-GBIC  
4-port 10/100/1000BASE-T  
I/O module options  
8-port 1000BASE-X GE Module  
1-port 10GBASE-R-XENPAK Module  
Fabric performance  
32 Gbps  
64 Gbps  
Maximum aggregate  
system performance  
72 Gbps  
54 Mpps  
144 Gbps  
108 Mpps  
Packet processing  
Input voltage  
24 Mpps  
48 Mpps  
AC: 100 V to 240 V, 50 to 60 Hz  
350 W  
Max power consumption  
(all components installed)  
650 W  
PoE input voltage  
-46 V to -55 V; 55.0 A  
Environment temperature  
0 to 40 0 C (32 to 104 0 F) and 10% to 90%  
and  
humidity  
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INSTALLING THE SWITCH 7750  
2
The following sections describe how to prepare and install the components of the  
Switch 7750:  
WARNING: Only trained and qualified personnel should install and maintain  
3Com products.  
Preparing to Install  
This section provides guidelines for preparing your site and switch for installation.  
General Safety Before installing your switch, note the following safety recommendations:  
Recommendations  
Switch off the power supply before connecting the cables.  
Keep the switch away from heat sources.  
To ensure normal heat dissipation, do not stack switches.  
Do not keep the switch in a damp place, and prevent liquid from getting into  
the switch.  
Ensure that the neutral point of the power is grounded properly, to avoid  
personal injury.  
Ensure that the power is off before plugging or unplugging the modules and  
cables of the switch.  
Before moving the chassis, disconnect all the power cords and external cables.  
To avoid damage to the switch, connect all the cables correctly. Never connect  
telephone cables (including the ISDN lines) to the console or AUX port.  
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34  
CHAPTER 2: INSTALLING THE SWITCH 7750  
During the installation, wear an antistatic wrist strap and antistatic gloves. See  
“Static Electricity” on page 35 for additional information on preventing static.  
WARNING: Follow local safety regulations when performing any operation with  
the Switch 7750. Follow the related safety information and special safety  
instructions provided by 3Com. 3Com bears no responsibility for accidents that  
occur due to violations of safe operation requirements.  
Electrical Safety To maintain electrical safety, note the following recommendations:  
Look carefully for possible hazards in your work area, such as ungrounded  
power extension cables, missing safety grounds, and moist floors.  
Locate the emergency power-off switch in the room where you are working.  
Shut the power off at once in the event of an accident.  
Unplug all the power cords and external cables before moving the chassis.  
Never assume that power is disconnected from a circuit. Always check.  
Moving the Switch Use caution when moving the Switch 7750. Note the following recommendations  
when moving the switch:  
Do not move the switch alone. Work with another person.  
Move the switch slowly. Never move suddenly or twist your body.  
Always disconnect all external cables (including power cord) before lifting or  
moving the chassis.  
Do not hold the power handles when carrying the switch.  
Do not put fingers into the vent of the chassis when carrying the switch.  
Since the power handles and vent have not been designed to bear the weight  
of the entire chassis, using them to carry the switch may damage the switch or  
even injure personnel.  
Laser Safety Some I/O modules on the Switch 7750 have optical ports. Make sure that an  
optical connector is connected to the optical ports, or a dust proof cover is fitted,  
as invisible laser radiation can be emitted from the port.  
WARNING: Never look at the transmit LED/laser through a magnifying device  
while it is powered on. Never look directly at the fiber TX port and fiber cable ends  
when they are powered on.  
General Site  
Requirements  
The environment of the installation site influences the performance and lifetime of  
the switch. The installation site for your switch should meet the requirements  
described in the following sections.  
Temperature and Humidity  
To ensure normal operation and to prolong the operational lifetime of the switch,  
the temperature and humidity of the equipment room must be within controlled  
limits. The requirements for the temperature and humidity of the switch  
installation site are listed in Table 41.  
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Installation Checklist  
35  
Table 41 Temperature and Humidity Requirements  
Temperature  
Relative humidity (noncondensing)  
00 to 400C (320 to 1040F)  
10% to 90%  
Static Electricity  
To prevent damage caused by the static electricity, ensure that:  
The equipment is grounded  
The equipment room is dust-proof  
Adequate temperature and humidity conditions are maintained.  
The operator wears an antistatic wrist strap while handling the module.  
The module is placed upward on the antistatic workbench, or put into an  
antistatic bag.  
Avoid direct contact with the elements of the circuit board.  
Electromagnetic Discharge  
To prevent damage by electromagnetic discharge, do the following:  
Take effective measures against electrical interference for the power supply  
system.  
Separate the working ground of the switch from the grounding device of the  
power equipment, or lightning conductor.  
Adopt electromagnetic shielding if necessary.  
Lightning Damage  
To minimize the risk of lightning damage do the following:  
Install a lightning arrester on the input end of a telephone cable, or other  
external line.  
Ensure that the PGND wire of the chassis is well grounded  
Ensure that the neutral point of the socket of AC power supply is well  
grounded  
Install a lightning arrester at the input end of the power supply  
Installation Space The Switch 7750 is a complex piece of equipment so it is necessary to make  
arrangements for the installation position, power supply, and cabling.  
For better heat dissipation and equipment maintenance, 3Com recommends that  
you keep the front and back of the switch more than 1 meter (3 feet) away from  
the walls or other devices. The sides of the switch should be at least 0.8 meters  
(2.5 ft) away from the walls. If the optional cabinet is installed, the clear height of  
room should be more than 3 meters (10 ft).  
Installation Checklist  
When you open the packing case of the switch, check the contents against the  
your order contract. Contact your Service representative if you find any  
discrepancies.  
To install the Switch 7750, you will need:  
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36  
CHAPTER 2: INSTALLING THE SWITCH 7750  
Tools  
Phillips screwdriver  
Flat-head screwdriver  
Antistatic wrist strap  
Cables  
Console cable  
AUX cable  
Power cord and chassis ground wire  
Interface cables for the selected interface modules  
Equipment  
The switch  
Ethernet 100BASE-T Hub or LAN switch  
Channel service unit/data service unit (CSU/DSU) or other data  
communications equipment (DCE) equipment (such as a modem)  
Configuration terminal, such as a PC  
Additional equipment for the selected interface modules  
Installing the Chassis  
You can install the Switch 7750 in a standard, 19-inch cabinet or on a workbench.  
Installing in a Standard When you are ready to install the Switch 7750 in the cabinet:  
Cabinet  
1 Carry the switch to the front of the cabinet. At least two people are required to  
move the switch.  
2 Put the switch on the tray or the guides and push it into the cabinet.  
3 Fix the switch in the cabinet with the combination screw and floating nuts that are  
shipped with the switch.  
Installing on a To install the switch on a workbench, take the following precautions:  
Workbench  
Ensure that the workbench is smooth and stable.  
Leave a heat-dissipation clearance in the front and back of the switch of more  
than 1 m (3 ft) and at least 0.8 meters (2.5 ft) away from the walls on the sides.  
Do not put heavy objects on the switch.  
Installing the Cabling  
Rack  
To install the cabling rack:  
1 Attach the rack brace to the left side of the chassis (opposite the fan frame).  
2 Insert the wiring channel into the brace and fasten the screws.  
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Installing a Module  
37  
Installing a Module  
To install a module:  
1 Wear an antistatic wrist strap.  
2 Remove the blanking plate from the chassis slot and save it for future use.  
3 Hold the ejector levers of the module with both hands and push them outward.  
4 Align the module with the guides in the chassis and slide it gently into the slot.  
5 Push the module until the captive thumb screw on its handle bar touches the hole  
in the chassis.  
6 Push the ejector levers inward and push the handle bar pin into the positioning  
hole in the chassis.  
7 Fasten the modules captive mounting screws into the holes in the chassis with a  
screwdriver.  
Installing a  
Submodule  
To install a submodule in the Fabric 32 you need the following tools:  
Phillips-head screwdriver #2  
Small pliers  
Do the following:  
1 Wear an antistatic wrist strap.  
2 Unfasten the screws on the Fabric 32 printed circuit board at locations M11 and  
M18.  
3 Unfasten and remove the submodule blanking plate from the Fabric 32.  
4 Fasten the screw with guide pin on the Fabric 32 printed circuit board at location  
M2.1  
5 Fasten the four hexagonal stand-off bolts at M3, M4, M11, and M18 on the Fabric  
32 printed circuit board. Do not overtighten these bolts.  
6 Position the submodule on the four hexagonal stand-off bolts, insuring that the  
guide pin on the Fabric 32 matches the guide hole of the submodule.  
7 Apply pressure near the edge connectors of the submodule to insure that the  
submodule connector is firmly seated.  
8 Insert and fasten screws into the bolts that you installed in Step 5.  
To remove the submodule, reverse this procedure.  
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38  
CHAPTER 2: INSTALLING THE SWITCH 7750  
Connecting the  
Ground Wire  
To connect the ground wire:  
1 Wear an antistatic wrist strap.  
2 Remove the screw from the grounding hole in the switch chassis.  
3 Set the ground wire connector around the grounding screw.  
4 Fasten the grounding screw in the hole on the chassis.  
5 Connect the other end of the ground wire to the grounding bar of the switch.  
If you install the switch in a cabinet, 3Com recommends that the ground wire of  
the switch be connected to the grounding bar of the cabinet.  
WARNING: The resistance between switch chassis and the ground should be less  
than 1 ohm.  
Connecting and  
Configuring Power  
The Switch 7750 requires power connection from the AC power source and from  
the PoE power rack.  
Connecting AC Power To connect AC power cords:  
Cords  
1 Power off all the related parts of the switch before connecting the AC power cord  
2 Plug the power cords into the sockets in the switch and attach the retention clips  
to the power cord plugs.  
3 Plug the other end of the cords into a socket strip with surge protector. Connect  
the strip to the power source in the room.  
Figure 28 illustrates the power cord connection.  
Figure 28 Power Cord Connection  
1 AC power sockets  
2 Retention clips  
3 Grounding screw  
WARNING: For surge protection, the power should be channelled through an  
external protection device into the Switch 7750.  
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Connecting and Configuring Power  
39  
Connecting the PoE Follow these steps to connect the power cord from the PoE rack:  
Power Cord  
1 Loosen the mounting screw of the PoE terminal block on the rear panel of the  
switch.  
2 Insert the -48V OT terminal of the DC power cord to the NEG (-) terminal of the  
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal  
of the external PoE power supply. See Figure 29 for a detailed view.  
Figure 29 Back of the PoE Rack  
1 PoE external power input: NEG (-)  
2 (+) PoE external power input: NEG (+)  
3 COM port (external power monitor)  
3 Insert the GND OT terminal of the DC power cord to the RTN (+) terminal of the  
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal  
of the site power.  
Figure 30 Front Panel of the PoE Rack  
1 AC input socket  
2 DC output terminal: NEG (-)  
3 DC output terminal: RTN (+)  
4 RS232 serial port  
4 Insert the PGND OT terminal of the DC power cord to the grounding screw of the  
switch and fasten the mounting screw; insert the other end to the grounding bar  
for the switch.  
For detailed instructions on how to install the PoE rack, see the Switch 7750 PoE  
Rack Installation Guide.  
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40  
CHAPTER 2: INSTALLING THE SWITCH 7750  
Installing the Fan  
Assembly  
To install the fan:  
1 Wear an antistatic wrist strap.  
2 Remove the fan frame from the pack.  
3 Hold the ejector levers on the fan frame with both hands and push them outward.  
4 Align the fan with the guides in the chassis and slide it gently into the slot.  
5 Push the fan until its positioning pin touches the hole in the chassis.  
6 Push the ejector levers inward.  
7 Push the handle bar pin into the hole in the chassis.  
WARNING: To avoid injury, do not touch any naked wire, terminal, or any other  
part of the product labelled Dangerous Voltage. Always wear the antistatic wrist  
strap when installing the fan.  
Installing Cables  
This section describes how to connect console and AUX cables to the Switch  
7750.  
Connecting the Console The console cable is an 8-core shielded cable. One end of the cable has a crimped  
Cable RJ-45 connector, which is plugged into the console port of the switch. The other  
end has both a DB-9-hole connector and a DB-25-hole connector for connection  
to a 9-hole or 25-hole serial port at the configuration terminal.  
See “Console Cable” on page 67 for cable illustration and pinout details.  
To connect a terminal or PC to the Switch 7750 using the console cable:  
1 Plug the DB-9 or DB-25 female plug of the console cable to the serial port of the  
PC or the terminal where the switch is to be configured.  
2 Connect the RJ-45 connector of the console cable to the console port of the  
switch.  
Connecting the AUX An AUX cable is used to connect the Switch 7750 to a modem in a remote dial-up  
Cable configuration.  
The AUX cable is an 8-core shielded cable. One end of the cable is an RS-232  
RJ-45 connector, which is used to plug into the switch at the console port. The  
other end has both a DB-9-pin connector and a DB-25 pin for connection to a  
9-hole or 25-hole serial port on the virtual modem.  
See “AUX Cable” on page 67 for cable illustration and pinout details.  
To connect the AUX cable:  
1 Plug the RJ-45 end of the AUX cable into the switch console port.  
2 Connect the DB-25 or DB-9 end of the AUX cable to the serial port of the virtual  
modem.  
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Installing Cables  
41  
Connecting Module This section describes how to connect electrical and optical cables.  
Cables  
Connecting Electrical Port Cables  
The 48-port 10/100BASE-T module and 8-port 10/100/1000BASE-T module  
require a RJ-45 connector and category-5 twisted pair cable. See “Electrical Port  
Connector” on page 68 for an illustration of the RJ-45 connector and MDI/MDI-X  
pinout details.  
Use the following steps to connect the port:  
1 Plug one end of the straight-through cable into the Ethernet RJ-45 port of the  
switch.  
2 Plug the other end of the straight-through cable into the RJ-45 port of the hub or  
LAN Switch.  
Ports on 48-port 10/100BASE-T and 8-port 10/100/1000BASE-T modules support  
MDI/MDI-X auto-sensing.  
Connecting Optical Fiber Cables  
The following modules require fiber optic cables:  
24-port 100BASE-FX MMF FE module  
20-port 1000BASE-X-SFP module  
1000BASE-SX-MM, 1000BASE-LX-SM-IR, and 1000BASE-LX-SM optional GBIC  
modules for the 4-port 1000BASE-X-GBIC submodule  
When connecting optical fiber cables, use the fiber connectors that are  
appropriate for the optical port type of the peer equipment that is connected to  
the local network port module. See “Optical Fiber Cable Connectors” on page 69  
for illustrations of the fiber optic cable connectors.  
Single-mode optical fiber cable is used for external connections of the single-mode  
optical port. Multi-mode optical fiber cable is used for external connections of the  
multi-mode optical port.  
Before connecting the optical fiber cable, make sure the type of the connector and  
the optical fiber cable are consistent with the optical port type.  
WARNING: When a connector is not inserted in the optical port or when its  
dustproof cover is open, invisible radiation can escape from the optical port. Do  
not stare into the optical port directly. Cover the optical port if there is no  
connector plugged in.  
SC fiber connector  
The 8-port 1000BASE-X GBIC module requires an SC optical fiber connector.  
To attach the SC fiber connector:  
1 Plug one end of the SC fiber connector into the optical port in the module.  
2 Connect the other end of the connector to the corresponding device.  
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42  
CHAPTER 2: INSTALLING THE SWITCH 7750  
CAUTION: When connecting an SC fiber connector, the switch TX must be  
connected to the RX of the device on the network, and the switch RX must be  
connected to the TX of the device on the network.  
MT-RJ fiber connector  
The 24-port 100BASE-FX MMF FE module requires an MT-RJ optical fiber  
connector.  
To attach the MT-RJ fiber connector:  
1 Plug the MT-RJ fiber connector in the optical port into the module.  
2 Connect the other end of the fiber connector to the corresponding device.  
Installing  
Cabling  
This section describes how to install and bind cables for your Switch 7750.  
Bench-Mounted Switch If you have installed your chassis on a bench, all interface cables run on the left  
side of the chassis in the cabling channel, and the chassis power cords run by the  
rear chassis panel.  
Rack-Mounted Switch If you have installed your switch in a 19-inch standard rack, the cables are bound  
on the cable binding rack at the left side of the chassis and arranged to run on the  
cable rack or under a raised floor. Collect all the transit data signal cable  
connectors and locate them on the floor of the chassis. Power cords run out of the  
rear left of the chassis and on a cable rack or under a raised floor.  
Cable Binding Keep the following precautions in mind as you bind cables:  
Do not allow cables to twist or bend as you bind them.  
The cable body cannot be bent at an angle that is more than twice its diameter.  
The cable running out of a connector cannot be bent more than five times its  
diameter.  
Different types of cables (power cord, signal cable, and ground wire) should  
not be bound together in a cabinet. Although different types of cable may  
cross over each other, they must not be bound together where they cross. For  
parallel cabling, the space between a power cord and a signal cable should be  
no less than 30 mm (1.25 in).  
The cable binding rack and cable channel inside and outside a cabinet should  
be smooth.  
The hole through which a cable runs through should be smooth or have a  
rubber grommet.  
Use plastic cabling ties to bind the cables.  
Bind cables before bending them. Ensure that no tie binds the bent part of any  
cables to prevent the core of the cable from breaking.  
Do not tie power cables to the guides of any mobile components.  
For the cable terminals fixed with screws, the screws or nuts should be  
fastened securely.  
Do not use tapping screws to fasten the cabling terminals.  
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Post-installation Checklist  
43  
Follow the parameters defined in Table 42 for binding cables with ties.  
Table 42 Cable Binding Parameters  
Cable Bundle Diameter  
10 mm (0.5in)  
Space Between Bundles  
80-150 mm (3.5 – 6 in)  
150-200 mm (6 – 8 in)  
200-300 mm (8 – 12 in)  
10-30 mm (.5 – 1.2 in)  
30 mm (1.2 in)  
Post-installation  
Checklist  
After you install your switch, use the checklist in Table 43 to verify that your switch  
operates correctly.  
WARNING: Confirm that you have turned off the power before checking your  
installation. Improper connections can injure people or damage components of  
the switch.  
Table 43 Installation Checklist  
Item  
Normal  
Abnormal (Remarks)  
Antistatic wrist strap  
Console cable  
Ground wire  
Power cord  
Fabric  
I/O module  
Fan frame  
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44  
CHAPTER 2: INSTALLING THE SWITCH 7750  
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CONFIGURING THE SWITCH 7750  
3
The following sections of this chapter describe how to configure and boot the  
Switch 7750:  
Configuring the  
Switch 7750 and a  
Local Terminal  
Configure the local terminal and Switch 7750, using Figure 31 as a reference. The  
terminal (a PC in this example) is connected to the switch console port using a  
console cable.  
Figure 31 Connecting the Switch 7750 to a PC  
Switch  
Console cable  
1 Plug the DB-9 or DB-25 female plug of the console cable into the serial port of the  
PC or the terminal where the switch will be configured.  
2 Connect the RJ-45 connector of the console cable to the console port of the  
switch.  
Setting Terminal  
Parameters  
To set terminal parameters and open a HyperTerminal session:  
1 Start the PC and select Start > Programs > Accessories > Communications >  
HyperTerminal.  
The Connection Description dialog box displays, as shown in Figure 32.  
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46  
CHAPTER 3: CONFIGURING THE SWITCH 7750  
Figure 32 Connection Description Dialog Box  
2 Enter the name of the new connection in the Name field and click OK. The dialog  
box, shown in Figure 33 displays. Select the serial port to be used from the  
Connect using dropdown menu.  
Figure 33 Properties Dialog Box  
3 After selecting serial ports, click OK. The port shown in Figure 34 displays and you  
can set serial port parameters. Set the following parameters:  
Baud rate = 9600  
Databit = 8  
Parity check = none  
Stopbit = 1  
Flow control = none  
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Setting Terminal Parameters  
47  
Figure 34 COM1 Properties Dialog Box  
4 Click OK. The HyperTerminal dialogue box displays, as shown in Figure 35.  
Figure 35 HyperTerminal Window  
5 Select Properties.  
6 In the Properties dialog box, select the Settings tab, shown in Figure 36.  
7 Select VT100 in the Emulation dropdown menu.  
8 Click OK.  
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48  
CHAPTER 3: CONFIGURING THE SWITCH 7750  
Figure 36 Settings Tab  
Booting the Switch  
7750  
Before powering on the Switch 7750, verify that:  
Power cords have been properly connected.  
The voltage of power supply can meet the requirements on the switch.  
The console cable has been connected properly.  
The PC or terminal for configuration has been started.  
The terminal parameters have been set.  
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Booting the Switch 7750  
49  
Powering up and Turn on the power for the Switch 7750 and run the BootROM program. The  
Booting terminal displays the following information:  
Starting......  
RAM Line....OK  
System is booting.....................  
******************************************  
*
*
* Switch 7750 BOOTROM, Version 300  
*
*
*
******************************************  
Copyright(C) 2001-2005 by 3Com Corporation, Inc.  
Creation date: Mar 25 2003, 09:33:05  
CPU type  
: MPC8260  
CPU Clock Speed : 200Mhz  
BUS Clock Speed : 66Mhz  
Memory Size  
: 256MB  
FAB64 self testing...............................  
60X_SDRAM Data lines Selftest.............................OK!  
60X_SDRAM Address lines Selftest..........................OK!  
60X_SDRAM fast selftest...................................OK!  
Please check LEDs.....................LEDs selftest finished!  
Switch chip selftest......................................OK!  
CPLD selftest.............................................OK!  
The switch Mac address is .....................00E0.FC00.7505  
Press Ctrl+B to enter Boot Menu... 5  
To enter Boot Mode (see Chapter 6), press Ctrl+B during the 5 seconds that “Press  
Ctrl+B to enter Boot Menu...5” is displayed. To perform decompression  
immediately, press ESC while this message is displayed. If you do nothing, the  
system enters the following auto-booting port within 5 seconds:  
Auto-booting....................  
Auto booting file is sw7750001.app  
There are 2 files in this packet  
FAB64 app file <<FAB64001.app>> is...OK  
Decompress  
Image...............................................................  
....................................................................  
....................................................................  
....................................................................  
..............OK!  
Starting at 0x60000...  
User interface Aux0 is available  
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50  
CHAPTER 3: CONFIGURING THE SWITCH 7750  
The display of these messages indicates the completion of the switch  
auto-booting. Press Enter and the terminal screen displays:  
<3Com>  
You can now begin the configuration for the Switch 7750.  
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MAINTAINING SOFTWARE  
4
This chapter covers the following topics:  
Upgrading Software  
The following sections describe how to upgrade software on your Switch 7750:  
Always save the configuration file before upgrading applications.  
Upgrading the Software To upgrade the software image of a Switch 7750, use one of the following  
Image procedures:  
Upgrading Software Use the following procedure to upgrade software with FTP:  
with FTP  
1 Log in to the system with super-user privileges.  
2 From the SW7750 command line, transfer the file from the FTP server to the  
system, using the ftpcommand.  
3 Specify the file to boot the system from, using the bootcommand.  
4 Reboot the system, using the rebootcommand.  
The following example illustrates this procedure:  
<SW7750>su  
Password:  
Now user privilege is 3 level, and just commands which level is  
equal to or less than this level can be used.  
Privilege note: 0-VISIT, 1-MONITOR, 2-SYSTEM, 3-MANAGE  
<SW7750>ftp 10.10.110.1  
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52  
CHAPTER 4: MAINTAINING SOFTWARE  
Trying ...  
Press CTRL+K to abort  
Connected.  
220 3Com 3CDaemon FTP Server Version 2.0  
User(none):anonymous  
331 User name ok, need password  
Password: xxxxxxx  
230 User logged in  
[ftp]bin  
200 Type set to I.  
[ftp]get sw7750003.app  
200 PORT command successful.  
150 File status OK ; about to open data connection  
226 Closing data connection; File transfer successful.  
FTP: 3794803 byte(s) received in 130.480 second(s)  
29.08Kbyte(s)/sec.  
[ftp]quit  
221 Service closing control connection  
<SW7750>boot boot-loader primary sw7750003.app  
The specified file will be booted next time!  
<SW7750>reboot  
This will reboot Switch. Continue? [Y/N] y  
For more detailed descriptions of the setup and procedures for upgrading  
software, see the remaining sections in this chapter.  
Upgrading Software To perform this procedure, you must have a network connection to the  
Using The BOOT Menu management port on the Switch 7750 Fabric module.  
After powering on the Switch 7750, the BootROM program runs automatically.  
The terminal displays the following information:  
Starting......  
RAMLine.....OK  
System is booting.....................  
******************************************  
*
*
*
*
* Switch 7750 BOOTROM, Version 500  
*
******************************************  
Copyright (c) : 2003-2005 3Com Corporation  
Creation date : Jan 20 2005, 09:37:12  
CPU type  
: MPC8245  
CPU Clock Speed : 400Mhz  
BUS Clock Speed : 66Mhz  
BOOT_FLASH type : M29W040B  
Flash Size  
Memory Size  
: 32MB  
: 256MB  
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Upgrading Software  
53  
FAB96 self testing..........................................  
SDRAM Data lines Selftest.................................OK!  
SDRAM Address lines Selftest..............................OK!  
SDRAM fast selftest.......................................OK!  
Please check LEDs.....................LEDs selftest finished!  
CPLD selftest.............................................OK!  
FPGA selftest.............................................OK!  
The switch Mac address is .....................0020.4C6A.CF04  
Press Ctrl+B to enter Boot Menu...  
1 Press Ctrl+B. The system displays the prompt for the BootROM password:  
Password :  
To access the BOOT Menu, press Ctrl+B during the five seconds that “Press Ctrl-B  
to enter Boot Menu...” displays. After five seconds, the system begins program  
decompression. If you want to access the BOOT Menu after this, you must reboot  
the switch.  
2 Enter the BootROM password. After entering the correct password (no password  
is set for the switch by default), the system will access the BOOT Menu:  
CAUTION: While using the switch, keep in mind the modified BOOTROM  
password.  
Boot Menu  
1: Download application file to flash  
2: Select application file to boot  
3: Display all files in flash  
4: Delete file from flash  
5: Modify bootrom password  
0: Reboot  
Enter your choice(0-5):  
Downloading an Application to Flash Memory  
To download an application to flash memory:  
1 Select option 1 on the Boot Menu. The following menu displays:  
1. Set TFTP protocol parameter  
2. Set FTP protocol parameter  
3. Set XMODEM protocol parameter  
0. Return to boot menu  
Enter your choice(0-3): 1  
2 Select option 1then enter the appropriate information in the fields that display:  
Load File name  
Switch IP address  
Server IP address  
:sw7750003.app  
:10.10.110.1  
:10.10.110.50  
3 Type Y at the download prompt so the system downloads the file to flash:  
Are you sure to download file to flash? Yes or No(Y/N) y  
4 After the download is complete, select option 0to return to the boot menu.  
5 From the boot menu, select option 2then select the newly downloaded file.  
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54  
CHAPTER 4: MAINTAINING SOFTWARE  
Selecting the Application File for the Boot  
If the Switch 7750 primary image fails because of a CRC error or a file format  
error, you can configure the system to find the backup image you select to boot  
from.  
To select the image file that you want the system to boot from:  
1 Select 0to return to the Boot Menu.  
2 Select option 2from the Boot Menu. The following text displays:  
File Number  
File Size(bytes)  
File Name  
========================================================  
1.  
4
6256229  
1012  
snmpboots  
2(-).  
3.  
SW7750-V300RE-8016.app  
taskswitch.log  
private-data.txt  
s.t  
4.  
151  
5.  
228308  
1975  
6.  
sw7750.cfg  
7.  
631736  
462848  
228376  
199696  
2427  
Btm400.btm  
8(*).  
9.  
SW7750-V300R-.app  
S3com400.app  
8241btm.app  
vrpcfg.txt  
10.  
11.  
12.  
13.  
203460  
228308  
lpcom400.app  
snec400.app  
The current application file is :SW7750-V300R-.app  
The backup application file is :SW7750-V300RE-8016.app  
Free Space : 7536640 bytes  
3 Enter the file number of the primary image:  
Please input the primary image file number :13  
4 To confirm this choice, type Y at the prompt:  
The primary file you selected is snec400.app, are you sure? Yes or  
No(Y/N) Y  
On reboot,snec400.app will become the default application file to  
boot!  
5 Enter the file number of the backup image:  
Please input the backup image file number : 8  
6 To confirm this choice, type Y at the prompt:  
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Upgrading Software  
55  
The file you selected is SW7750-V300R-.app, are you sure? Yes or  
No(Y/N) y  
On reboot,SW7750-V300R-.app will become the default application file  
to boot!  
7 Type Y to run the primary image:  
Do you want to run snec400.app now? Yes or No(Y/N)? Y  
No Backup Image If you do not enter the number of a backup boot file, the  
following text displays:  
Please input the backup boot file number :  
Input Error!  
Failed to select backup image file!  
Type Y to run the primary boot file:  
Do you want to run snec400.app now? Yes or No(Y/N)? Y  
Backup Image Fails If the backup image fails and another backup image  
configuration does not exist, the Switch 7750 will try to find any valid image on  
the flash. This image is not the primary or backup image:  
All Images Fail If all images fail, the Switch 7750 will return to the boot menu:  
primary image : snec400.app  
backup image : SW7750-V300R-.app  
There is one passed image in addition:  
File Number  
========================================================  
1. 6256229 SW7750-V300RE-8016.app  
File Size(bytes)  
File Name  
Press Ctrl+B to enter Boot Menu... 0  
Auto-booting....................  
Auto booting file is snec400.app  
No LPU application file < vxworks.app > in flash  
Please download LPU application file vxworks.app to flash  
No correct main file to boot!  
loading backup image file to boot!  
Auto booting backup file is SW7750-V300R-.app  
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56  
CHAPTER 4: MAINTAINING SOFTWARE  
Assert at file: 'vfs_flsh.c', Line: 4549  
There are 3 files in this package  
SRPU app file error! backup boot file is corrupted!  
Select a file to boot from!  
the num is 1  
the num is 2  
File SW7750-V300RE-8016.app is selected for autoBoot:  
backup file is SW7750-V300RE-8016.app  
There are 3 files in this package  
SRPU app file <<FAB64R.app>> is...OK  
Decompress  
Image...............................................................  
....................................................................  
....................................................................  
....................................................................  
........................................OK!  
Starting at 0x60000...  
The primary image name is saved in flash memory, the secondary image name is  
saved in the EPPROM. However, if you use the display boot command to display  
the boot image it will only read from flash so only the primary image will be  
displayed. The secondary boot image name cannot be displayed when there is an  
image error.  
Upgrading Software The Xmodem protocol transmits files through serial ports and supports both  
Using Xmodem 128-byte and 1K-byte packets. Xmodem also supports two types of check; normal  
checksum and CRC. When there is a packet error, retransmission is supported,  
normally 10 times.  
The Xmodem protocol completes transmission by receiving and sending programs.  
The receiving program first sends the negotiating characters to negotiate the  
check means. After passing the negotiation, the sending program begins to send  
the packet.  
The receiving program checks the packet according to the negotiated means after  
receiving a complete packet. The acknowledgement characters are sent after  
passing the check and then the sending program continues to send the next  
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Upgrading Software  
57  
packet. If the check fails, negative characters are sent and the sending program  
sends the packet again.  
1 Enter 1in the BOOT Menu and press Enter. The system accesses the download  
application file menu:  
1. Set TFTP protocol parameter  
2. Set FTP protocol parameter  
3. Set XMODEM protocol parameter  
0. Return to boot menu  
Enter your choice (0-3):  
2 Enter 3in the download program menu.  
Enter your choice(0-3): 3  
3 Press Enter. The system enters the download rate-setting menu:  
Please select your download baudrate:  
1. 9600  
2. 19200  
3. 38400  
4. 57600  
5. 115200  
0. Exit  
Enter your choice (0-5):  
4 Select the appropriate download speed. For example, enter 5to select a download  
speed of 115200bps.  
5 Press Enter. The terminal displays the following information:  
Download baudrate is 115200 bps. Please change the terminal’s  
baudrate to 115200 bps, and select XMODEM protocol.  
Press enter key when ready.  
6 Change the baud rate set at the configuration terminal, so that the baud rate is  
consistent with the selected download baud rate of the software.  
7 Disconnect the terminal and reconnect it.  
8 Press Enter to start downloading. The terminal displays the following information:  
Now please start transfer file with XMODEM protocol.  
If you want to exit, Press <Ctrl+X>.  
Waiting ... CCCCC  
9 Select Transfer\Send File from the terminal window.  
10 Click Browse in the Send file dialog box, shown in Figure 37 and select the  
application you want to download.  
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58  
CHAPTER 4: MAINTAINING SOFTWARE  
Figure 37 Send File dialog box  
11 Change the protocol name for the download to Xmodem.  
12 Click Send. The dialog box shown in Figure 38 displays.  
Figure 38 Xmodem File Send Dialog Box  
13 After the download is complete, the system interface is shown, as follows:  
Loading ...CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC done!  
14 Select 0to return to the Boot Menu.  
15 From the boot menu, select option 2then select the newly downloaded file.  
Upgrading Software TFTP (Trivial File Transfer Protocol) is a simple file transfer protocol that is used  
Using TFTP without complex interaction between clients and servers.  
The client initiates a TFTP transmission. To download files, the client sends a read  
request packet to the TFTP server, receives the packet from the server, and sends  
the acknowledgement to the server. To upload files, the client sends a write  
request packet to the TFTP server, sends the data packet to the server, and receives  
the acknowledgement from the server.  
The Switch 7750 provides the functions of the TFTP client.  
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Lost Passwords  
59  
A TFTP Server program is shipped on the CDROM with the Switch 7750.  
Before you upgrade:  
Verify that there is a connection between the TFTP server and the Switch 7750  
(use the pingcommand.)  
Verify that the TFTP server is set up according to the manufacturer's instructions  
and that it is enabled and pointing to the correct directory.  
To upgrade using TFTP:  
1 Verify that you are logged in with super-user privileges.  
2 From the Switch 7750 command line (in user view), TFTP the image file from the  
TFTP server to the Switch 7750 using the following command:  
tftp <TFTP Server IP Address> get <Source File/image>< Dest  
File-Optional>  
3 Set the boot parameters to specify the file to boot the system from, using the  
following command:  
boot boot-loader primary filename  
4 Reboot the system.  
The following example illustrates this procedure:  
<SW7750>tftp 10.10.110.1 get sw7750003.app  
Transfer file in binary mode.  
Now begin to download file from remote tftp server, please wait...  
/
TFTP: 5690749 bytes received in 376 second(s).  
File downloaded successfully.  
<SW7750>boot boot-loader primary sw7750003.app  
The specified file will be booted next time!  
<SW7750>reboot  
This command will reboot the system. Continue? [Y/N] y  
Lost Passwords  
If the BootROM password of the switch is lost, contact your local support center,  
listed in Appendix B.  
Using the BOOT Menu After you power on the Switch 7750, the BootROM program runs automatically.  
The terminal displays the following information:  
Starting......  
RAMLine.....OK  
System is booting.....................  
******************************************  
*
*
*
*
* Switch 7750 BOOTROM, Version 500  
*
******************************************  
Copyright (c) : 2003-2005 3Com Corporation  
Creation date : Jan 20 2005, 09:37:12  
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60  
CHAPTER 4: MAINTAINING SOFTWARE  
CPU type  
: MPC8245  
CPU Clock Speed : 400Mhz  
BUS Clock Speed : 66Mhz  
BOOT_FLASH type : M29W040B  
Flash Size  
Memory Size  
: 32MB  
: 256MB  
FAB96 self testing..........................................  
SDRAM Data lines Selftest.................................OK!  
SDRAM Address lines Selftest..............................OK!  
SDRAM fast selftest.......................................OK!  
Please check LEDs.....................LEDs selftest finished!  
CPLD selftest.............................................OK!  
FPGA selftest.............................................OK!  
The switch Mac address is .....................0020.4C6A.CF04  
Press Ctrl+B to enter Boot Menu...  
The contents displayed on the terminal can vary with different versions of Boot  
ROM.  
If you press Ctrl+B immediately, the system displays the Boot Menu. If you do not  
press Ctrl+B, the system initiates the program decompression process. At this time  
if you want to access the BOOT Menu, you must reboot the switch.  
Press Ctrl+B. The system displays:  
Initialize flash file system. Please wait!  
Password :  
Enter the BootROM password. After entering the correct password (no password  
is set for the switch by default), the system will access the BOOT Menu:  
Boot Menu  
1: Download application file to flash  
2: Select application file to boot  
3: Display all files in flash  
4: Delete file from flash  
5: Modify bootrom password  
0: Reboot  
Enter your choice(0-5):  
CAUTION: While using the switch, please keep in mind the modified BOOTROM  
password.  
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MAINTAINING HARDWARE  
5
This chapter covers the following topics:  
The procedures in this chapter should be performed by trained service personnel  
only.  
Replacing a Power  
Module  
To replace a power module, you need:  
An antistatic wrist strap  
A screwdriver  
WARNING: Insure that the switch is powered off before removing or installing a  
power module.  
Removing the AC Power To remove the power module, do the following:  
Module  
1 Power off the Switch 7750.  
2 Remove the power cord from both the power module and the AC power socket.  
3 Loosen the retaining screw that secures the power supply on the lower right front  
of the power supply.  
4 Remove the power supplies approximately 2 inches (5 cm) from the chassis to  
disconnect the power supply AC connectors from the AC power module.  
5 Loosen and remove the 4 screws at the corners of the power module.  
6 Remove the power module from the chassis.  
Installing the AC Power To install the new power module, do the following:  
Module  
1 Slide the replacement power module into the power module slot in the bottom  
rear of the chassis.  
2 Insert and tighten the 4 screws at the corners of the power module.  
3 Reconnect the power supplies to the power module.  
4 Tighten the retaining screw on the lower right front of the power supply.  
5 Connect 2 power cords to the power module.  
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62  
CHAPTER 5: MAINTAINING HARDWARE  
6 Connect the power cords to separate AC power sources on separate power grids  
or to a UPS/backup power system.  
WARNING: Do not power on the switch until you reconnect all the components.  
Replacing a Power  
Supply  
To replace a power supply, you need:  
An antistatic wrist strap  
A screwdriver  
WARNING: When installing or replacing the power supply when the power is on,  
do not touch any naked wire, terminal, or any other part of the product labeled  
Dangerous Voltage. Always wear the antistatic wrist strap when replacing the  
supply.  
Use the following steps to replace a power supply:  
1 Loosen the captive screws in the supply that you want to replace.  
2 Support the power supply you are removing with one hand and gently pull the  
handle with the other hand until it slides out of the slot.  
3 If you are not going to install another power supply in this slot, install a blanking  
plate on the chassis for dust-proofing and heat dissipation.  
4 Remove the new power supply from the package and check the input mode.  
5 Support the power supply in one hand and hold the handle with another hand.  
Align the supply with the guides in the chassis and slide the supply gently into the  
slot.  
CAUTION: As you are inserting the power supply, if the pin terminal springs up,  
the pin cannot be seated into the hole and the system will sound an alarm. If the  
power supply has not been inserted properly, you should slide it out and insert it  
again to avoid breaking or cracking the power terminals.  
6 Fasten the captive screws.  
CAUTION: If the captive screws cannot be fastened, the power supply may not  
have been properly seated. Remove and replace the supply.  
Over time, the filter on the power supply accumulates dust, which interferes with  
the heat dissipation of the chassis. It is important to periodically clean the filter as  
described below:  
1 Remove the gauze filter by gently pulling it from the front of the power supply.  
2 Take the filter to a fresh water supply and clean it.  
3 Leave the filter to dry. Do not use heat to dry the filter as this may cause it to  
distort.  
4 When the filter is completely dry, gently push it back into the front of the power  
module.  
CAUTION: Do not clean the filter while it is in position at the front of the power  
supply. Attempts to do so could result in damage to the equipment or severe  
electrical shock.  
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Replacing I/O Modules  
63  
Replacing I/O Modules To replace an I/O module, you need:  
An antistatic wrist strap  
A Screwdriver  
To remove a module:  
1 Remove all the cables from the module to be removed.  
2 Loosen the captive screws.  
3 Hold the ejector levers on the module with both hands, and press them toward  
both sides to separate the connectors of the module from the motherboard.  
4 Gently slide the module along the guides and out of the slot.  
5 Put the removed module into the package that contained the replacement  
module.  
Replace the blanking plate on the chassis if you do not install a new module in the  
place where the old one was removed.  
To install a replacement module:  
1 With both hands, hold the ejector levers on the module that will be installed.  
2 Align the module with the guides in the chassis and slide it into the slot gently  
until you feel the positioning pin on the handle bar touch the hole in the chassis.  
3 Press the ejector levers inward and seat the pin on the handle bar into the  
positioning hole in the chassis.  
4 Fasten the captive screws to fix the module.  
Replacing the Fan  
Assembly  
You can hot-swap fan assemblies in the Switch 7750.  
To replace a fan assembly, you need:  
An antistatic wrist strap  
A Screwdriver  
WARNING: To avoid injury, do not touch any naked wire, terminal, or any part of  
the product labeled Dangerous Voltage. Always wear the antistatic wrist strap  
when replacing the fan module.  
To replace a fan assembly:  
1 Put on the antistatic wrist strap.  
2 With both hands, pull out the ejector levers on the fan assembly to separate the  
fan assembly connector from the backplane.  
3 Pull the fan gently along the guides of the slot to remove it.  
4 With both hands, pull out the ejector levers of the fan that will be installed. Align  
it with the guides in the chassis and slide it gently into the slot until you feel the  
positioning pin on the handle bar touch the hole in the chassis.  
5 Press the ejector levers inward and seat the pin on the handle bar into the  
positioning hole in the chassis.  
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64  
CHAPTER 5: MAINTAINING HARDWARE  
WARNING: If the fan fails, replace it with a new one without delay before  
operating the Switch 7750. Failure to do so will cause the switch to overheat.  
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TROUBLESHOOTING  
6
This chapter covers the following topics:  
The simplest way to diagnose a fault is to check the system status LEDs on the  
Fabric modules. In addition, with the DeviceMgr network management system,  
you can also locate the fault through management software.  
Troubleshooting the  
Configuration  
After the switch is powered on, booting information is displayed on the  
configuration terminal. If the configuration system has failed, there is no screen  
display at the configuration terminal or the displayed characters are illegible.  
No information is If there is no information displayed on the terminal after the Switch 7750 is  
displayed on the powered on, check that:  
terminal  
The power system is working normally.  
The Fabric is working normally.  
The console cable has been connected to the console port in the Fabric.  
If this procedure does not reveal the problem, verify that the console cable is  
properly connected and that the configuration terminal is set correctly.  
The display characters If the displayed characters are illegible, the parameters of configuration terminal  
are illegible may not have been set correctly. See Setting Terminal Parameters on page 45.  
Troubleshooting  
Power  
If the Power OK LED is off, there may be something wrong with the system power  
supply. Check that:  
The power module has been installed in the correct position to ensure normal  
communication with the backplane.  
The switch power has been turned on.  
The power cord is connected properly.  
The source voltage is correct.  
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66  
CHAPTER 6: TROUBLESHOOTING  
Table 44 describes power LEDs on the Fabric. (continued)  
Table 44 Power LEDs on the Fabric  
LED  
Status Description  
OK  
On — The power is working normally.  
Off — The power has failed or has not been installed.  
FAIL  
On — The power has failed.  
Off — The power is working normally or has not been installed.  
Troubleshooting the  
Fan  
If the fan OK LED is off, check that:  
The fan has been installed in the correct position for normal communication  
with the backplane.  
Every heat dissipation fan is working normally.  
There is nothing blocking the vent of the chassis.  
The blanking plates are installed on the chassis where no module is inserted.  
Table 45 describes fan LEDs on the Fabric.  
Table 45 Fan LEDs on the Fabric  
LED  
Status Description  
OK  
On — The fan is working normally.  
Off — The fan has failed or has not been installed.  
FAIL  
On — The fan has failed.  
Off — The fan is working or has not been installed  
Troubleshooting the  
Modules  
The Fabric and I/O module LEDs show the status of the FABRIC and the I/O  
modules, as described in Table 46.  
If the ALM LED of the module remains green or green flashing, it indicates  
there is something wrong with the module.  
During the process of resetting the module, the ALM LED remains on. After  
normal booting, it is off.  
When resetting the module, if the ALM LED remains off, the module may not  
be connected to the power source. Verify that the module has been properly  
installed in the correct position.  
Table 46 Module LEDs on the Fabric  
LED  
Status Description  
RUN  
Green/Off — The module has failed or has not been inserted.  
Green flashing — The module is working normally.  
ALM  
Off — The module is working or has not been inserted.  
Green or green flashing— The module has failed.  
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SWITCH 7750 CABLES  
A
This appendix covers the following types of cables and connectors:  
Console Cable  
Figure 39 illustrates the console cable and connectors.  
Figure 39 The Console cable  
Enlargedd A side  
DB25 Female  
8P8C Plug  
Enlarged B side  
Enlarged C side  
DB9 Female  
Table 47 lists console cable pin-outs.  
Table 47 Console Cable Pin-outs  
RJ-45  
Signal  
RTS  
Direction  
<----  
<----  
<----  
--->  
DB-25  
DB-9  
1
2
3
4
5
6
7
8
4
7
4
3
1
5
2
6
8
DTR  
TXD  
CD  
20  
2
8
GND  
RXD  
DSR  
CTS  
----  
7
--->  
3
--->  
6
--->  
5
AUX Cable  
Figure 40 illustrates the AUX cable.  
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68  
APPENDIX A: SWITCH 7750 CABLES  
Figure 40 The AUX Cable  
DB25 Male  
8P8C Plug  
Enlargedd A side  
Label  
Enlarged B side  
Enlarged C side  
DB9Male  
Table 48 lists the AUX cable pin-outs.  
Table 48 AUX Cable Pin-outs  
RJ-45  
Signal  
RTS  
Direction  
--->  
DB-25  
DB-9  
1
2
3
4
5
6
7
8
4
7
4
3
1
5
2
6
8
DTR  
TXD  
CD  
--->  
20  
2
--->  
<---  
8
GND  
RXD  
DSR  
CTS  
---  
7
<---  
3
<---  
6
<---  
5
Electrical Port  
Connector  
Figure 41 illustrates the RJ-45 connector.  
Figure 41 The RJ-45 Connector  
PIN #8  
PIN #1  
Table 49 lists RJ-45 MDI port pin-outs.  
Table 49 RJ-45 MDI Port Pin-outs  
Pinout 10BASE-T/100BASE-TX  
1000BASE-T  
Signal  
Tx+  
Function  
Send data  
Send data  
Signal  
BIDA+  
BIDA-  
Function  
1
2
Send data to direction A  
Tx-  
Receive data from direction A  
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Optical Fiber Cable Connectors  
69  
Table 49 RJ-45 MDI Port Pin-outs (continued)  
Pinout 10BASE-T/100BASE-TX 1000BASE-T  
3
4
5
6
7
8
Rx+  
Receive data  
BIDB+  
BIDC+  
BIDC-  
BIDB-  
BIDD+  
BIDD-  
Send data to direction B  
Reserved  
Reserved  
Rx-  
-
Receive data from direction C  
Send data to direction C  
-
Receive data  
Receive data from direction B  
Send data to direction D  
Reserved  
Reserved  
-
-
Receive data from direction D  
Tx = Send data Rx = Receive data BI = I-directional data.  
Table 50 lists RJ-45 MDI-X Port Pin-outs.  
Table 50 RJ-45 MDI-X Port Pinouts  
Pinout 10BASE-T/100 BASE-TX  
1000BASE-T  
Signal  
Rx+  
Function  
Signal  
BIDB+  
BIDB-  
Function  
1
2
3
4
5
6
7
8
Receive data  
Send data to direction B  
Rx-  
Receive data  
Receive data from direction B  
Send data to direction A  
Tx+  
Send data  
BIDA+  
BIDD+  
BIDD-  
BIDA-  
BIDC+  
BIDC-  
Reserved  
Reserved  
Tx-  
-
Receive data from direction D  
Send data to direction D  
-
Send data  
Receive data from direction A  
Send data to direction C  
Reserved  
Reserved  
-
-
Receive data from direction C  
Optical Fiber Cable  
Connectors  
Figure 42 illustrates the SC optical fiber cable connector.  
Figure 42 SC Optical Fiber Connector  
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70  
APPENDIX A: SWITCH 7750 CABLES  
Figure 43. illustrates the MT-RJ fiber optic cable connector.  
Figure 43 The MT-RJ Fiber Connector  
Figure 44 illustrates the LC connector.  
Figure 44 LC Connector  
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OBTAINING SUPPORT FOR YOUR  
SWITCH  
B
Register Your Product  
to Gain Service  
Benefits  
To take advantage of warranty and other service benefits, you must first register  
your product at http://eSupport.3com.com/. 3Com eSupport services are based  
on accounts that you create or have authorization to access. First time users must  
apply for a user name and password that provides access to a number of eSupport  
features including Product Registration, Repair Services, and Service Request.  
Purchase Value-Added  
Services  
To enhance response times or extend warranty benefits, contact 3Com or your  
authorized 3Com reseller. Value-added services can include 24x7 telephone  
technical support, software upgrades, onsite assistance or advance hardware  
replacement. Experienced engineers are available to manage your installation with  
minimal disruption to your network. Expert assessment and implementation  
services are offered to fill resource gaps and ensure the success of your networking  
projects. More information on 3Com Extended Warranty and Professional Services  
is available at http://www.3com.com/  
Contact your authorized 3Com reseller or 3Com for additional product and  
support information.  
Troubleshoot Online  
You will find support tools posted on the 3Com web site at  
3Com Knowledgebase helps you troubleshoot 3Com products. This  
query-based interactive tool is located at http://knowledgebase.3com.com  
and contains thousands of technical solutions written by 3Com support  
engineers.  
Connection Assistant helps you install, configure and troubleshoot 3Com  
desktop and server NICs, wireless cards and Bluetooth devices. This diagnostic  
software is located at:  
ankyou.html  
Access Software  
Downloads  
Software Updates are the bug fix / maintenance releases for the version of  
software initially purchased with the product. In order to access these Software  
Updates you must first register your product on the 3Com web site at  
First time users will need to apply for a user name and password. A link to  
software downloads can be found at http://eSupport.3com.com/, or under the  
Product Support heading at http://www.3com.com/.  
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72  
APPENDIX B: OBTAINING SUPPORT FOR YOUR SWITCH  
Software Upgrades are the software releases that follow the software version  
included with your original product. In order to access upgrades and related  
documentation you must first purchase a service contract from 3Com or your  
reseller.  
Contact Us  
3Com offers telephone, e-mail and internet access to technical support and repair  
services. To access these services for your region, use the appropriate telephone  
number, URL or e-mail address from the list below. You will find a current directory  
of support telephone numbers posted on the 3Com web site at  
Telephone Technical  
Support and Repair  
To obtain telephone support as part of your warranty and other service benefits,  
you must first register your product at http://eSupport.3com.com/  
When you contact 3Com for assistance, please have the following information  
ready:  
Product model name, part number, and serial number  
A list of system hardware and software, including revision level  
Diagnostic error messages  
Details about recent configuration changes, if applicable  
To send a product directly to 3Com for repair, you must first obtain a return  
authorization number (RMA). Products sent to 3Com, without authorization  
numbers clearly marked on the outside of the package, will be returned to the  
sender unopened, at the senders expense. If your product is registered and under  
warranty, you can obtain an RMA number online at  
http://eSupport.3com.com/. First time users will need to apply for a user name  
and password.  
Telephone numbers are correct at the time of publication. Find a current directory  
of support telephone numbers posted on the 3Com web site at  
Country  
Telephone Number  
Country  
Telephone Number  
Asia, Pacific Rim Telephone Technical Support and Repair  
Australia  
Hong Kong  
India  
1 800 678 515  
800 933 486  
+61 2 9424 5179 or  
000800 650 1111  
001 803 61009  
00531 616 439 or  
03 5977 7991  
Philippines  
1235 61 266 2602 or  
1800 1 888 9469  
10800 61 00137 or  
021 6350 1590 or  
00800 0638 3266  
800 6161 463  
P.R. of China  
Indonesia  
Japan  
Singapore  
S. Korea  
Taiwan  
080 333 3308  
00801 611 261  
Malaysia  
1800 801 777  
New Zealand  
Pakistan  
0800 446 398  
+61 2 9937 5083  
Thailand  
001 800 611 2000  
You can also obtain support in this region using the following e-mail: [email protected]  
Or request a repair authorization number (RMA) by fax using this number: + 65 543 6348  
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Telephone Technical Support and Repair  
73  
Country  
Telephone Number  
Country  
Telephone Number  
Europe, Middle East, and Africa Telephone Technical Support and Repair  
From anywhere in these  
regions, call:  
+44 (0)1442 435529  
From the following countries, you may use the numbers shown:  
Austria  
Belgium  
Denmark  
Finland  
France  
Germany  
Hungary  
Ireland  
Israel  
01 7956 7124  
070 700 770  
7010 7289  
01080 2783  
0825 809 622  
01805 404 747  
06800 12813  
01407 3387  
1800 945 3794  
199 161346  
Luxembourg  
Netherlands  
Norway  
342 0808128  
0900 777 7737  
815 33 047  
00800 441 1357  
707 200 123  
0800 995 014  
9 021 60455  
07711 14453  
08488 50112  
0870 241 3901  
Poland  
Portugal  
South Africa  
Spain  
Sweden  
Switzerland  
U.K.  
Italy  
You can also obtain support in this region using the following URL: http://emea.3com.com/support/email.html  
Latin America Telephone Technical Support and Repair  
Antigua  
Argentina  
Aruba  
Bahamas  
Barbados  
Belize  
Bermuda  
Bonaire  
Brazil  
Cayman  
Chile  
Colombia  
Costa Rica  
Curacao  
Ecuador  
Dominican Republic  
1 800 988 2112  
0 810 444 3COM  
1 800 998 2112  
1 800 998 2112  
1 800 998 2112  
52 5 201 0010  
1 800 998 2112  
1 800 998 2112  
0800 13 3COM  
Guatemala  
Haiti  
Honduras  
Jamaica  
Martinique  
Mexico  
Nicaragua  
Panama  
Paraguay  
Peru  
Puerto Rico  
Salvador  
Trinidad and Tobago  
Uruguay  
Venezuela  
Virgin Islands  
AT&T +800 998 2112  
57 1 657 0888  
AT&T +800 998 2112  
1 800 998 2112  
571 657 0888  
01 800 849CARE  
AT&T +800 998 2112  
AT&T +800 998 2112  
54 11 4894 1888  
AT&T +800 998 2112  
1 800 998 2112  
AT&T +800 998 2112  
1 800 998 2112  
AT&T +800 998 2112  
AT&T +800 998 2112  
57 1 657 0888  
1 800 998 2112  
AT&T +800 998 2112  
AT&T +800 998 2112  
AT&T +800 998 2112  
1 800 998 2112  
AT&T +800 998 2112  
AT&T +800 998 2112  
You can also obtain support in this region using the following:  
Spanish speakers, enter the URL:  
Portuguese speakers, enter the URL:  
English speakers in Latin America should send e-mail to:  
US and Canada Telephone Technical Support and Repair  
1 800 876 3266  
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74  
APPENDIX B: OBTAINING SUPPORT FOR YOUR SWITCH  
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