Connecting Cisco ISDN PRI Network Modules to
the Network
Revised: May 1, 2008, OL-12811-01
This guide describes how to connect Cisco Integrated Services Digital Network (ISDN) Primary Rate
Interface (PRI) network modules to your network. It contains the following sections:
•
•
•
•
•
•
•
•
•
•
Note
Note
Unless specifically identified, references to PRI modules in this chapter include all these network
modules.
Do not install an ISDN BRI network module in the same chassis as an ISDN PRI network module, unless
you are using Cisco IOS Release 11.3(3)T or later. Earlier Cisco IOS releases do not support this
configuration.
CT1/PRI modules are available with or without a built-in channel service unit (CSU), and with one or
two ports. CT1/PRI modules connect to an external CSU; CT1/PRI-CSU modules connect directly to the
network. Each T1 module provides up to 24 virtual channels per T1 port. Each channel can be configured
individually as a serial interface.
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized T1/E1 PRI Network Modules with G.703
Table 1
Modular Access Routers Supporting Cisco Channelized T1/E1 PRI Network Modules
with G.703
Modular Access Router
Cisco 3660
NM-1CE1T1-PRI
NM-2CE1T1-PRI
Yes
Yes
Yes
Yes
Cisco 37xx
modules with G.703.
Figure 1
1-Port Channelized T1/E1 PRI Network Module with G.703
NM-1CE1T1-PRI
RX
TX
CD
LP
MON
MON
T1
AIM
RA
LA
E1-BAL
E1-UNBAL
C0
EN
CTLR 0
Figure 2
2-Port Channelized T1/E1 PRI Network Module with G.703
NM-2CE1T1-PRI
RX
TX
CD
LP
CD
LP
MON
MON
T1
T1
AIM
RA
LA
C1
C0
RA
LA
E1-BAL
E1-UNBAL
E1-BAL
E1-UNBAL
EN
CTLR 1
CTLR 0
Enabling Wetting Current on Channelized T1/E1 PRI Network Modules with
G.703
Wetting current is a small amount of electrical current (60 to 140 milliamps) sent from the central office
to the card to prevent the corrosion of electrical contacts in the module network connection.
The wetting current feature can be enabled or disabled by the end user. It is controlled by the location of
To enable the wetting current feature, connect pins 1 and 2 on the J8 and J9 connectors with the jumper.
To disable the wetting current feature, either remove the jumper completely, or use the jumper to connect
pins 2 and 3 on the J8 and J9 connectors.
The card is shipped with the jumper connecting pins 2 and 3 on the J8 and J9 connectors, disabling the
wetting current feature.
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized T1/E1 PRI Network Modules with G.703
Figure 3
Wetting Current Jumper Locations on Channelized T1/E1 PRI Network Modules with
G.703
J8/J9
1
2
3
Wetting current
jumper
Wetting current
enabled
J8/J9
1
2
3
Wetting current
disabled
NM-2CE1T1-PRI
3
2
1
CD
9
RA
LA
LP
T1
CTLR
1
RX
MON
E1-B
E1-UNB
3
2
1
TX
MON
8
C1
C0
CD
RA
LA
LP
T1
CTLR
0
E1-B
E1-UNB
AIM
EN
Connecting Channelized T1/E1 PRI Network Modules with G.703 to a Network
Warning
For connections outside the building where the equipment is installed, the following ports must be
connected through an approved network termination unit with integral circuit protection: T1
Statement 1044
Figure 4 shows a connection between a channelized T1/E1 PRI network module with G.703 and a
networking device.
Caution
To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety,
connect the 1-port T1/E1 channelized PRI network modules with G.703 (NM-1CE1T1-PRI) and 2-port
T1/E1 channelized PRI network modules with G.703 (NM-2CE1T1-PRI) only to intrabuilding or
nonexposed wiring or cabling. The intrabuilding cable must be shielded and the shield must be grounded
at both ends.
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized T1/ISDN PRI Network Modules
Figure 4
Connecting a Channelized T1/E1 PRI Network Module with G.703 to a Networking
Device
NM-1CE1T1-PRI
RX
TX
CD
LP
MON
MON
T1
AIM
RA
LA
E1-BAL
E1-UNBAL
C0
EN
CTLR 0
Channelized T1/ISDN PRI Network Modules
This section provides information about the following network modules for Cisco modular routers:
•
This module is also referred to as the 1-port CT1/PRI network module.
•
This module is also referred to as the 2-port CT1/PRI network module.
Figure 5
1-Port Channelized T1/ISDN PRI Network Module
cT1
PRI
EN
CTRLR 0
CT1/PRI-U port (DB-15)
Figure 6
2-Port Channelized T1/ISDN PRI Network Module
cT1
PRI
EN
CTRLR 1
EN
CTRLR 0
CT1/PRI-U ports (DB-15)
Connecting CT1/PRI Modules to the Network
To connect a CT1/PRI module to the network, use a DB-15-to-DB-15 T1 serial cable to connect the
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized T1/ISDN PRI with CSU Network Modules
Figure 7
Connecting a CT1/PRI Module to a T1 CSU
FE–PRI
1FE-1CT1
10/100BaseT
CTRLR 0
R
LARM
L
LARM
L
B
CAIER
DCET
CLO
LNIK
1M0bps
FXD
EN
CT1/PRI port (DB-15)
T1 serial
cable
T1 CSU
CT1/PRI port (DB-15)
Channelized T1/ISDN PRI with CSU Network Modules
This section provides information about the following network modules for Cisco modular routers:
•
1-port channelized T1/ISDN PRI with CSU network module (NM-1CT1-CSU or
network module.
•
2-port channelized T1/ISDN PRI with CSU network module (NM-2CT1-CSU or
network module.
Figure 8
1-Port Channelized T1/ISDN PRI with CSU Network Module
cT1
CSU
RX
OUT
TX
IN
RX
MON
EN
CTRLR 0
Monitor and
test ports
CT1/PRI CSU
port (RJ-48)
(Bantam)
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules
Figure 9
2-Port Channelized T1/ISDN PRI with CSU Network Module
cT1
CSU
CTRLR 1
RX
OUT
TX
IN
RX
MON
EN
CTRLR 0
Monitor and
test ports
CT1/PRI CSU
port (RJ-48)
(Bantam)
Connecting CT1/PRI CSU Modules to the Network
To connect a CT1/PRI CSU module to the network, use a straight-through RJ-48C-to-RJ-48C cable to
Figure 10
Connecting a CT1/PRI CSU Module to an RJ-48C Jack
FE–PRI
1FE-1CT1-CSU
10/100BaseT
R
LARM
L
LARM
L
B
CAIER
DCET
CLO
LNIK
1
FDX
CLTR0
EN
CT1/PRI CSU
port (RJ-48C)
RJ-48C jack
Channelized E1/ISDN PRI Balanced (120-Ohm) Network
Modules
This section provides information about the following network modules for Cisco modular routers:
•
1-port channelized E1/ISDN PRI balanced (120-ohm) network module (NM-1CE1B or
module.
•
2-port channelized E1/ISDN PRI balanced (120-ohm) network module (NM-2CE1B or
module.
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules
Figure 11
1-Port Channelized E1/ISDN PRI Network Module (Balanced)
cE1-B
PRI
EN
CTRLR 0
CE1/PRI-B port
Figure 12
2-Port Channelized E1/ISDN PRI Network Module (Balanced)
cE1-B
PRI
CTRLR 1
EN
CTRLR 0
CE1/PRI-B ports
CE1/PRI modules are available with one or two E1 ports and with balanced or unbalanced interfaces.
These modules receive and transmit data bidirectionally at the E1 rate of 2.048 Mbps, and provide up to
30 virtual channels per E1 port. Each channel can be configured individually as a serial interface.
CE1/PRI Module Jumper Settings
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground. (See
Table 2.) The default setting for balanced, 120-ohm CE1/PRI-B modules disconnects receive shield to
ground. The default setting for unbalanced, 75-ohm CE1/PRI-U modules connects receive shield to
ground. If you are experiencing ground loop problems with E1 cabling, you may want to try changing
the jumper settings for the module.
Table 2
CE1/PRI Module Jumpers
CE1/PRI Module Type Default Setting Function
Balanced, 120-ohm 2 and 3
Unbalanced, 75-ohm 1 and 2
Disconnects receive shield from ground
Connects receive shield to ground
Connecting CE1/PRI-B Modules to the Network
To connect a CE1/PRI-B (120-ohm) module to the network, use the appropriate cable to connect the
RJ-45 CSUs, respectively.) These ports are color-coded tan.
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules
Figure 13
Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-DB-15 Connectors)
FE-PRI
1FE-1CE1-B/U
10/100BaseT
CTRLR 0
R
LARM
O
LARM
L
B
CAIER
DCET
CLO
LNIK
1M0bps
FXD
EN
CE1/PRI-B (DB-15)
E1 cable for 120-ohm
balanced connections
with a DB-15 connector
at the network end
E1 CSU
DB-15 connector
Figure 14
Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-Twinax Connectors)
FE-PRI
1FE-1CE1-B/U
10/100BaseT
CTRLR 0
R
LARM
O
LARM
P
B
CAIER
DCET
CLO
LNIK
1M0bps
FXD
EN
CE1/PRI port (DB-15)
E1 cable for 75-ohm
balanced connections
with twinax connectors
at the network end
E1 CSU
Twinax connectors
Figure 15
Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-RJ-45 Connectors)
FE-PRI
1FE-1CE1-B/U
10/100BaseT
CTRLR 0
E
LARM
O
LARM
L
B
CAIER
DCET
CLO
LNIK
1M0bps
FXD
EN
CE1/PRI port (DB-15)
E1 cable for 120-ohm
balanced connections
with an RJ-45 connector
at the network end
RJ-45 jack
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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules
Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network
Modules
This section provides information about the following network modules for Cisco modular routers:
•
1-port channelized E1/ISDN PRI unbalanced (75-ohm) network module (NM-1CE1U or
module.
•
2-port channelized E1/ISDN PRI unbalanced (75-ohm) network module (NM-2CE1U or
module.
Figure 16
1-Port Channelized E1/ISDN PRI Network Module (Unbalanced)
cE1-U
PRI
EN
CTRLR 0
CE1/PRI-U port
Figure 17
2-Port Channelized E1/ISDN PRI Network Module (Unbalanced)
cE1-U
PRI
CTRLR 1
EN
CTRLR 0
CE1/PRI-U ports
CE1/PRI Module Jumper Settings
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground (see
Table 3). The default setting for balanced, 120-ohm CE1/PRI-B modules disconnects receive shield to
ground. The default setting for unbalanced, 75-ohm CE1/PRI-U modules connects receive shield to
ground. If you are experiencing ground loop problems with E1 cabling, you may want to try changing
the jumper settings for the module.
Table 3
CE1/PRI Module Jumpers
CE1/PRI Module Type Default Setting Function
Balanced, 120-ohm 2 and 3
Unbalanced, 75-ohm 1 and 2
Disconnects receive shield from ground
Connects receive shield to ground
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Connecting Cisco ISDN PRI Network Modules to the Network
PRI Module LEDs
Connecting CE1/PRI-U Modules to the Network
To connect a CE1/PRI-U (75-ohm) module to the network, use the appropriate cable to connect the
CE1/PRI-U port to an E1 CSU (see Figure 18). These ports are color-coded tan. The illustration shows
a CSU with BNC connectors.
Figure 18
Connecting a CE1/PRI-U Module to an E1 CSU
(DB-15-to-BNC Connectors)
FE-PRI
1FE-1CE1-B/U
10/100BaseT
CTRLR 0
E
LARM
O
LARM
L
B
CAIER
DCET
CLO
LNIK
1M0bps
FXD
EN
CE1/PRI-U
E1 cable for 75-ohm
unbalanced connections
with BNC connectors
at the network end
E1 CSU
BNC connectors
PRI Module LEDs
All network modules have an enable (EN) LED. This LED indicates that the module has passed its
self-tests and is available to the router.
Table 4
ISDN PRI Network Module LEDs
LED
RA
LA
Meaning
Local alarm at remote end of connection
Loss of signal, loss of frame, or unavailability because of
excessive errors
LP
Loopback mode
CD
Carrier received on telco link
Channelized T1/E1 PRI Network Module with G.703 LEDs
for LED definitions.
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Connecting Cisco ISDN PRI Network Modules to the Network
PRI Module LEDs
Figure 19
1-Port Channelized T1/E1 PRI Network Module with G.703 LEDs
NM-1CE1T1-PRI
RX
TX
CD
LP
MON
MON
T1
AIM
RA
LA
E1-BAL
E1-UNBAL
C0
EN
CTLR 0
T1
E1-BAL
E1-UNBAL
C0
Figure 20
2-Port Channelized T1/E1 PRI Network Module with G.703 LEDs
NM-2CE1T1-PRI
RX
TX
CD
LP
CD
LP
MON
MON
T1
T1
AIM
RA
LA
C1
C0
RA
LA
E1-BAL
E1-UNBAL
E1-BAL
E1-UNBAL
EN
CTLR 1
CTLR 0
T1
E1-BAL
E1-UNBAL
T1
E1-BAL
E1-UNBAL
CTRL 1
CTRL 0
Table 5
Channelized T1/E1 PRI Network Module with G.703 LEDs
LED
Color
Meaning
T1
Green
Green
Interface is configured for balanced T1.
Interface is configured for balanced E1.
Interface is configured for unbalanced E1.
Port 0 is connected to the bantam monitor connector.
Port 1 is connected to the bantam monitor connector.
E1-BAL
E1-UNBAL Green
C0
Green
Green
Green
C1
AIM
An advanced integration module (AIM) is installed on the network module.
CT1/PRI Network Module LEDs
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PRI Module LEDs
Figure 21
1-Port CT1/PRI Network Module LEDs
cT1
PRI
EN
CTRLR 0
Enable LED
CT1/PRI LEDs
Figure 22
2-Port CT1/PRI Network Module LEDs
CT1/PRI LEDs
cT1
PRI
CTRLR 1
CTRLR 0
EN
CT1/PRI LEDs
Enable LED
CT1/PRI CSU Network Module LEDs
Figure 23
1-Port CT1/PRI CSU Network Module LEDs
cT1
CSU
RX
OUT
TX
IN
RX
MON
EN
CTRLR 0
CT1/PRI CSU LEDs
Figure 24
2-Port CT1/PRI CSU Network Module LEDs
CT1/PRI CSU LEDs
cT1
CSU
CTRLR 1
RX
OUT
TX
IN
RX
MON
EN
CTRLR 0
CT1/PRI CSU LEDs
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Connecting Cisco ISDN PRI Network Modules to the Network
Online Insertion and Removal with a Cisco PRI Network Module (Cisco 3660 and Cisco 3745 Only)
CE1/PRI Network Module LEDs
unbalanced modules.
Figure 25
1-Port CE1/PRI Network Module LEDs
cE1
PRI
EN
CTRLR 0
Enable LED
CE1/PRI LEDs
Figure 26
2-Port CE1/PRI Network Module LEDs
CE1/PRI LEDs
cE1
PRI
CTRLR 1
CTRLR 0
EN
CE1/PRI LEDs
Enable LED
Online Insertion and Removal with a Cisco PRI Network Module
(Cisco 3660 and Cisco 3745 Only)
Some Cisco modular access routers allow you to replace network modules without switching off the
router or affecting the operation of other interfaces. This feature is called online insertion and removal
(OIR). OIR of network modules provides uninterrupted operation to network users, maintains routing
information, and ensures session preservation.
Note
To determine if your router supports OIR, see the hardware installation guide for your router.
Caution
Cisco routers support OIR with similar modules only. If you remove a network module, install another
module exactly like it in its place. If you remove a network module with an installed interface card,
expansion module, or AIM, the replacement module should have the same hardware installed.
For a description of informational and error messages that may appear on the console during this
procedure, refer to the hardware installation guide for your type of router.
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Connecting Cisco ISDN PRI Network Modules to the Network
Upgrading ISDN PRI Network Modules
Upgrading ISDN PRI Network Modules
If your Cisco 3600 series router contains a legacy ISDN PRI network module and a digital modem
network module (product numbers NM-6DM, NM-12DM, NM-18DM, NM-24DM, or NM-30DM), your
ISDN PRI network module may need to be upgraded to revision level -03 or higher. Earlier revisions of
ISDN PRI network modules cannot send modem calls to the digital modem network module.
Note
Channelized T1/E1 PRI network modules with G.703 provide full support for Cisco digital modem
network modules.
If your PRI module is the wrong revision, you see a message similar to the following message when the
router boots:
The PRI network module in slot 0 is incompatible with the digital modems installed in the
router.
To determine the revision level, you can examine the network module itself (outside the router) or use
the Cisco IOS show diag command. The label on the module board should show a part number beginning
with 800- and ending with the revision level.
The output of the show diag command looks similar to the following:
Port adapter is analyzed
Port adapter insertion time unknown
Hardware revision 1.0
Board revision A0
Serial number
Test history
4152626
0x0
Part number
RMA number
800-01236-01
00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 26 01 00 00 3F 5D 32 50 04 CC 01 00 00 00 00
0x30: 50 00 00 00 96 11 04 17 FF FF FF FF FF FF FF FF
Related Documents
For additional information, see the following documents and resources.
Related Topic
Document Title
Regulatory compliance and safety
information
Cisco Network Modules and Interface Cards Regulatory Compliance and Safety
Information
Cisco IOS software website and reference Cisco IOS Software
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Obtaining Documentation, Obtaining Support, and Security Guidelines
Obtaining Documentation, Obtaining Support, and Security
Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback,
security guidelines, and also recommended aliases and general Cisco documents, see the monthly
What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical
documentation, at:
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