Cisco Systems OL-12811-01 User Manual
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:
• Channelized T1/E1 PRI Network Modules with G.703, page 2
• Channelized T1/ISDN PRI Network Modules, page 5
• Channelized T1/ISDN PRI with CSU Network Modules, page 6
• Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules, page 7
• Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules, page 10
• PRI Module LEDs, page 11
• Online Insertion and Removal with a Cisco PRI Network Module (Cisco 3660 and Cisco 3745
Only), page 14
• Upgrading ISDN PRI Network Modules, page 15
• Related Documents, page 15
• Obtaining Documentation, Obtaining Support, and Security Guidelines, page 16
Note Unless specifically identified, references to PRI modules in this chapter include all these network
modules.
Note 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
CT1/PRI and CT1/PRI-CSU modules receive and transmit data bidirectionally, at the T1 rate of
1.544 Mbps.
Channelized T1/E1 PRI Network Modules with G.703
This section provides information about the following network modules:
• 1-port T1/E1 channelized PRI network module with G.703 (NM-1CE1T1-PRI) (see Figure 1)
• 2-port T1/E1 channelized PRI network module with G.703 (NM-2CE1T1-PRI) (see Figure 2)
Cisco T1/E1 channelized PRI network modules with G.703 provide connection of one or two primary
rate ISDN lines. T1 or E1 interfaces are configurable through Cisco IOS command-line interface (CLI)
commands. Each port supports 100/120-ohm balanced and 75-ohm unbalanced termination, and features
RJ-48C connectors and cable accessories allowing for DB-15, BNC, and other connector types. An
onboard advanced integration module (AIM) connector allows for future universal port AIM support.
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.
Cisco T1/E1 channelized PRI network modules with G.703 (NM-1CE1T1-PRI and NM-2CE1T1-PRI)
replace the following network modules (also described in this chapter):
• NM-1CE1B
• NM-1CE1U
• NM-1CT1
• NM-1CT1-CSU
• NM-2CE1B
• NM-2CE1U
• NM-2CT1
• NM-2CT1-CSU
For information on Cisco modular access routers supporting Cisco channelized T1/E1 PRI network
modules with G.703, see Tab le 1.
Table 1 Modular Access Routers Supporting Cisco Channelized T1/E1 PRI Network Modules
with G.703
Modular Access Router NM-1CE1T1-PRI NM-2CE1T1-PRI
Cisco 26xx No No
Cisco 26xxXM Yes Yes
Cisco 2691 Yes Yes
Cisco 3620 No No
Cisco 3631 Yes Yes
Cisco 3640 No No
Connecting Cisco ISDN PRI Network Modules to the Network
2
Connecting Cisco ISDN PRI Network Modules to the Network
Table 1 Modular Access Routers Supporting Cisco Channelized T1/E1 PRI Network Modules
with G.703
Modular Access Router NM-1CE1T1-PRI NM-2CE1T1-PRI
Cisco 3660 Yes Yes
Cisco 37xx Yes Yes
Figure 1 and Figure 2 show the faceplates for the 1-port and 2-port channelized T1/E1 PRI network
modules with G.703.
Figure 1 1-Port Channelized T1/E1 PRI Network Module with G.703
NM-1CE1T1-PRI
Channelized T1/E1 PRI Network Modules with G.703
MON
RX
TX
MON
CD
RA
LAC0
CTLR 0
LP
T1
E1-BAL
E1-UNBAL
AIM
EN
Figure 2 2-Port Channelized T1/E1 PRI Network Module with G.703
NM-2CE1T1-PRI
CD
RA
LA
CTLR 1
LP
T1
E1-BAL
E1-UNBAL
RX
MON
TX
MON
C1
C0
CD
RA
LA
CTLR 0
LP
T1
E1-BAL
E1-UNBAL
AIM
EN
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.
82886
82887
The wetting current feature can be enabled or disabled by the end user. It is controlled by the location of
a jumper on the J8 (CTLR 0) and J9 (CTLR 1) connectors on the network module. (See Figure 3.)
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.
Connecting Cisco ISDN PRI Network Modules to the Network
3
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
enabled
J8/J9
1
2
3
Wetting current
disabled
NM-2CE1T1-PRI
RA
LA
CD
CTLR 1
Connecting Cisco ISDN PRI Network Modules to the Network
Wetting current
jumper
3
2
1
LP
T1
E1-B
E1-UNB
J9
RX
MON
TX
MON
C1
C0
CD
RA
LA
CTLR 0
3
2
1
J8
LP
T1
E1-B
E1-UNB
AIM
EN
88539
Connecting Channelized T1/E1 PRI Network Modules with G.703 to a Network
Warning
Caution To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety,
Connecting Cisco ISDN PRI Network Modules to the Network
4
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.
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.
Connecting Cisco ISDN PRI Network Modules to the Network
Figure 4 Connecting a Channelized T1/E1 PRI Network Module with G.703 to a Networking
Device
NM-1CE1T1-PRI
RX
TX
MON
MON
CD
LP
RA
LAC0
CTLR 0
Channelized T1/ISDN PRI Network Modules
This section provides information about the following network modules for Cisco modular routers:
• 1-port channelized T1/ISDN PRI network module (NM-1CT1 or CPANM-1CT1) (see Figure 5).
This module is also referred to as the 1-port CT1/PRI network module.
Channelized T1/ISDN PRI Network Modules
T1
AIM
E1-BAL
EN
E1-UNBAL
88639
• 2-port channelized T1/ISDN PRI network module (NM-2CT1 or CPANM-2CT1) (see Figure 6).
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
CARRIER
DETECT
LOOPBACK
LOCAL
ALARM
REMOTE
ALARM
CTRLR 0
CT1/PRI-U port (DB-15)
Figure 6 2-Port Channelized T1/ISDN PRI Network Module
cT1
PRI
REMOTE
ALARM
REMOTE
ALARM
LOCAL
ALARM
LOCAL
ALARM
CARRIER
DETECT
LOOPBACK
CARRIER
DETECT
LOOPBACK
CTRLR 1
CTRLR 0
CT1/PRI-U ports (DB-15)
EN
H7460
EN
EN
H7461
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
CT1/PRI port to a T1 channel service unit (CSU). (See Figure 7.) These ports are color-coded tan.
Connecting Cisco ISDN PRI Network Modules to the Network
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