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Table Of Contents

Connecting ISDN PRI Network Modules

Channelized T1/E1 PRI Network Modules with G.703

Enabling Wetting Current on Channelized T1/E1 PRI Network Modules with G.703

Connecting Channelized T1/E1 PRI Network Modules with G.703 to a Network

Channelized T1/ISDN PRI Network Modules

Connecting CT1/PRI Modules to the Network

Channelized T1/ISDN PRI with CSU Network Modules

Connecting CT1/PRI CSU Modules to the Network

Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules

CE1/PRI Module Jumper Settings

Connecting CE1/PRI-B Modules to the Network

Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules

CE1/PRI Module Jumper Settings

Connecting CE1/PRI-U Modules to the Network

PRI Module LEDs

Channelized T1/E1 PRI Network Module with G.703 LEDs

CT1/PRI Network Module LEDs

CT1/PRI CSU Network Module LEDs

CE1/PRI Network Module LEDs

Online Insertion and Removal with a Cisco PRI Network Module (Cisco 3660 and Cisco 3745 Only)

Upgrading ISDN PRI Network Modules


Connecting ISDN PRI Network Modules

This chapter describes how to connect Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) network modules for Cisco modular routers and contains the following sections:

• Channelized T1/E1 PRI Network Modules with G.703

• Channelized T1/ISDN PRI Network Modules

• Channelized T1/ISDN PRI with CSU Network Modules

• Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules

• Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules

• PRI Module LEDs

• Online Insertion and Removal with a Cisco PRI Network Module (Cisco 3660 and Cisco 3745 Only)

• Upgrading ISDN PRI Network Modules

Note Unless specifically identified, references to PRI modules in this chapter include all these network modules.

Note Cisco Fast Ethernet-PRI network modules also provide a PRI interface. See Chapter 4, "Connecting Fast Ethernet-PRI Network Modules," for further information.

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.

Tip To determine whether your router supports a specific network module, see Table 1-6 on page 1-16.

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.

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 7-1)

•2-port T1/E1 channelized PRI network module with G.703 (NM-2CE1T1-PRI) (see Figure 7-2)

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 Table 7-1.

Table 7-1 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

Cisco 3660

Yes

Yes

Cisco 37xx

Yes

Yes


Figure 7-1 and Figure 7-2 show the faceplates for the 1-port and 2-port channelized T1/E1 PRI network modules with G.703.

Figure 7-1 1-Port Channelized T1/E1 PRI Network Module with G.703

Figure 7-2 2-Port Channelized T1/E1 PRI Network Module with G.703

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 a jumper on the J8 (CTLR 0) and J9 (CTLR 1) connectors on the network module. (See Figure 7-3.)

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.

Figure 7-3 Wetting Current Jumper Locations on Channelized T1/E1 PRI Network Modules with G.703

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 7-4 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.

Figure 7-4 Connecting a Channelized T1/E1 PRI Network Module with G.703 to a Networking Device

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 7-5). This module is also referred to as the 1-port CT1/PRI network module.

•2-port channelized T1/ISDN PRI network module (NM-2CT1 or CPANM-2CT1) (see Figure 7-6). This module is also referred to as the 2-port CT1/PRI network module.

Figure 7-5 1-Port Channelized T1/ISDN PRI Network Module

Figure 7-6 2-Port Channelized T1/ISDN PRI Network Module

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 7-7.) These ports are color-coded tan.

Figure 7-7 Connecting a CT1/PRI Module to a T1 CSU

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 CPANM-1CT1-CSU) (see Figure 7-8). This module is also referred to as the 1-port CT1/PRI CSU network module.

•2-port channelized T1/ISDN PRI with CSU network module (NM-2CT1-CSU or CPANM-2CT1-CSU) (see Figure 7-9). This module is also referred to as the 2-port CT1/PRI CSU network module.

Figure 7-8 1-Port Channelized T1/ISDN PRI with CSU Network Module

Figure 7-9 2-Port Channelized T1/ISDN PRI with CSU Network Module

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 connect the RJ-48C port to an RJ-48C jack (see Figure 7-10). These ports are color-coded tan.

Figure 7-10 Connecting a CT1/PRI CSU Module to an 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 CPANM-1CE1B) (see Figure 7-11). This module is also referred to as the 1-port CE1/PRI-B network module.

•2-port channelized E1/ISDN PRI balanced (120-ohm) network module (NM-2CE1B or CPANM-2CE1B) (see Figure 7-12). This module is also referred to as the 2-port CE1/PRI-B network module.

Figure 7-11 1-Port Channelized E1/ISDN PRI Network Module (Balanced)

Figure 7-12 2-Port Channelized E1/ISDN PRI Network Module (Balanced)

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 7-2.) 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 7-2 CE1/PRI Module Jumpers

CE1/PRI Module Type
Default Setting
Function

Balanced, 120-ohm

2 and 3

Disconnects receive shield from ground

Unbalanced, 75-ohm

1 and 2

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 CE1/PRI-B port to an E1 CSU. (See Figure 7-13, Figure 7-14, and Figure 7-15, showing DB-15, twinax, and RJ-45 CSUs, respectively.) These ports are color-coded tan.

Figure 7-13 Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-DB-15 Connectors)

Figure 7-14 Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-Twinax Connectors)

Figure 7-15 Connecting a 120-ohm CE1/PRI-B Module to an E1 CSU (DB-15-to-RJ-45 Connectors)

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 CPANM-1CE1U) (see Figure 7-16). This module is also referred to as the 1-port CE1/PRI-U network module.

•2-port channelized E1/ISDN PRI unbalanced (75-ohm) network module (NM-2CE1U or CPANM-2CE1U) (see Figure 7-17). This module is also referred to as the 2-port CE1/PRI-U network module.

Figure 7-16 1-Port Channelized E1/ISDN PRI Network Module (Unbalanced)

Figure 7-17 2-Port Channelized E1/ISDN PRI Network Module (Unbalanced)

CE1/PRI Module Jumper Settings

Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground (see Table 7-3). 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 7-3 CE1/PRI Module Jumpers

CE1/PRI Module Type
Default Setting
Function

Balanced, 120-ohm

2 and 3

Disconnects receive shield from ground

Unbalanced, 75-ohm

1 and 2

Connects receive shield to ground


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 7-18). These ports are color-coded tan. The illustration shows a CSU with BNC connectors.

Figure 7-18 Connecting a CE1/PRI-U Module to an E1 CSU
(DB-15-to-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.

All PRI modules display four additional LEDs for each port. These LEDs are described in Table 7-4.

Table 7-4 ISDN PRI Network Module LEDs

LED
Meaning

RA

Local alarm at remote end of connection

LA

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

Figure 7-19 and Figure 7-20 show channelized T1/E1 PRI network module with G.703 LEDs. See Table 7-5 for LED definitions.

For LEDs found on all PRI network modules, see Table 7-4.

Figure 7-19 1-Port Channelized T1/E1 PRI Network Module with G.703 LEDs

Figure 7-20 2-Port Channelized T1/E1 PRI Network Module with G.703 LEDs

Table 7-5 Channelized T1/E1 PRI Network Module with G.703 LEDs

LED
Color
Meaning

T1

Green

Interface is configured for balanced T1.

E1-BAL

Green

Interface is configured for balanced E1.

E1-UNBAL

Green

Interface is configured for unbalanced E1.

C0

Green

Port 0 is connected to the bantam monitor connector.

C1

Green

Port 1 is connected to the bantam monitor connector.

AIM

Green

An advanced integration module (AIM) is installed on the network module.


CT1/PRI Network Module LEDs

Figure 7-21 and Figure 7-22 show CT1/PRI network module LEDs.

Figure 7-21 1-Port CT1/PRI Network Module LEDs

Figure 7-22 2-Port CT1/PRI Network Module LEDs

CT1/PRI CSU Network Module LEDs

Figure 7-23 and Figure 7-24 show CT1/PRI CSU module LEDs.

Figure 7-23 1-Port CT1/PRI CSU Network Module LEDs

Figure 7-24 2-Port CT1/PRI CSU Network Module LEDs

CE1/PRI Network Module LEDs

Figure 7-25 and Figure 7-26 show CE1/PRI module LEDs. These LEDs are the same for balanced and unbalanced modules.

Figure 7-25 1-Port CE1/PRI Network Module LEDs

Figure 7-26 2-Port CE1/PRI Network Module LEDs

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 All Cisco PRI network modules have OIR support, but OIR is supported only on Cisco 3660 and Cisco 3745 platforms.

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.

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     4152626       Part number    800-01236-01
Test history      0x0           RMA number     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

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Posted: Fri Dec 14 11:43:37 PST 2007
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