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ISDN BRI Network Modules

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Connecting Cisco ISDN BRI Network Modules to the Network

Table Of Contents

Connecting Cisco ISDN BRI Network Modules to the Network

4- and 8-Port ISDN BRI S/T Network Modules

Connecting BRI S/T Modules to a Network

BRI S/T Module LEDs

4- and 8-Port ISDN BRI U Network Modules

Connecting BRI U Modules to a Network

BRI U Module LEDs

Upgrading ISDN BRI Network Modules

Related Documents

Obtaining Documentation, Obtaining Support, and Security Guidelines


Connecting Cisco ISDN BRI Network Modules to the Network


Revised: May 1, 2008, OL-12810-01

This guide describes how to connect Cisco Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) network modules to your network. It contains the following sections:

4- and 8-Port ISDN BRI S/T Network Modules

4- and 8-Port ISDN BRI U Network Modules

Upgrading ISDN BRI Network Modules

Related Documents

Obtaining Documentation, Obtaining Support, and Security Guidelines


Note Unless specifically identified, references to BRI modules in this chapter include all ISDN BRI network modules.



Note Do not install an ISDN BRI network module in the same chassis as an ISDN Primary Rate Interface (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.


4- and 8-Port ISDN BRI S/T Network Modules

This section provides information about the following network modules for Cisco modular routers:

4-port ISDN BRI network module (NM-4B-S/T or CPANM-4B-S/T) (see Figure 1). This module connects to an ISDN WAN through an external Network Termination 1 (NT1) device (also known as an S/T interface). It is also referred to as the 4-port BRI S/T network module.

8-port ISDN BRI network module (NM-8B-S/T or CPANM-8B-S/T) (see Figure 2). This module connects to an ISDN WAN through an external NT1 device (also known as an S/T interface). It is also referred to as the 8-port BRI S/T network module.

Figure 1 4-Port ISDN BRI Network Module (S/T Interface)

Figure 2 8-Port ISDN BRI Network Module (S/T Interface)

Connecting BRI S/T Modules to a Network

To connect a BRI S/T network module to a network, use a straight-through RJ-45-to-RJ-45 cable to connect the ISDN BRI port to an NT1. (See Figure 3.) These ports are color-coded orange.

Figure 3 Connecting an ISDN BRI S/T Network Module to an NT1

BRI S/T Module LEDs

Figure 4 shows LEDs for the 4-port BRI S/T network module. Figure 5 shows LEDs for the 8-port BRI S/T network module.

Figure 4 4-Port ISDN BRI S/T Network Module LEDs

Figure 5 8-Port ISDN BRI S/T Network 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.

In addition, BRI S/T modules have two LEDs for each port. These LEDs indicate call activity on the two ISDN BRI B channels, as described in Table 1.

Table 1 BRI S/T Network Module LEDs

LED
Meaning

B1

Call active on B1 channel

B2

Call active on B2 channel


4- and 8-Port ISDN BRI U Network Modules

This section provides information about the following network modules for Cisco modular routers:

4-port ISDN BRI with NT1 network module (NM-4B-U or CPANM-4B-U) (see Figure 6). This module connects to an ISDN WAN using a built-in NT1 device (also known as a U interface). It is also referred to as the 4-port BRI U network module.

8-port ISDN BRI with NT1 network module (NM-8B-U or CPANM-8B-U) (see Figure 7). This module connects to an ISDN WAN using a built-in NT1 device (also known as a U interface). It is also referred to as the 8-port BRI U network module.

Figure 6 4-Port ISDN BRI with NT1 Network Module (U Interface)

Figure 7 8-Port ISDN BRI with NT1 Network Module (U Interface)

Connecting BRI U Modules to a Network

To connect a BRI U module to a network, use a straight-through RJ-45-to-RJ-45 cable to connect the ISDN BRI port to an RJ-45 jack. (See Figure 8.) These ports are color-coded red.

Figure 8 Connecting a BRI U Network Module to an RJ-45 ISDN Jack

BRI U Module LEDs

Figure 9 shows LEDs for the 4-port BRI U network module. Figure 10 shows LEDs for the 8-port BRI U network module.

Figure 9 4-Port ISDN BRI U Network Module LEDs

Figure 10 8-Port ISDN BRI U Network 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.

In addition, BRI U modules have three LEDs for each port. Two of these LEDs indicate call activity on the two ISDN BRI B channels, as described in Table 2. The third LED, labeled NT1, indicates synchronization status of the NT1.

Table 2 BRI U Network Modules LEDs

LED
Meaning

B1

Activity on B1 channel

B2

Activity on B2 channel

NT1

Synchronous status of NT1


Upgrading ISDN BRI Network Modules

If your Cisco 3600 series router contains an ISDN BRI network module (product numbers NM-4B-S/T, NM-4B-U, NM-8B-S/T, or NM-8B-U) and a digital modem network module (product numbers NM-6DM, NM-12DM, NM-18DM, NM-24DM, or NM-30DM), your ISDN BRI network module may need to be upgraded to the minimum revision shown in Table 3.

Earlier revisions of the ISDN BRI network module cannot send modem calls to the digital modem network module.

Table 3 ISDN BRI Network Module Upgrade Revisions

Module
Minimum Revision

NM-4B-S/T

800-01236-03

NM-4B-U

800-01238-06

NM-8B-S/T

800-01237-03

NM-8B-U

800-01239-06


If your BRI module is the wrong revision, you see a message similar to this one when the router boots:

The BRI 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-, corresponding to Table 3. A BRI S/T module whose part number ends with -01 or -02 needs to be upgraded, as does a BRI U module whose part number is lower than -06.

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

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
http://www.cisco.com/en/US/docs/routers/access/interfaces/rcsi/IOHrcsi.html

Cisco IOS software website and reference documentation

Cisco IOS Software http://www.cisco.com/web/psa/products/index.html?c=268438303


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:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html