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This chapter describes how to connect Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) network modules for Cisco modular routers. It contains the following sections:
Unless specifically identified, references to BRI modules in this chapter include all ISDN BRI network modules.
This section provides information about the following network modules for Cisco modular routers:
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 7-3.) These ports are color-coded orange.
Figure 7-4 shows LEDs for the 4-port BRI S/T network module. Figure 7-5 shows LEDs for the 8-port BRI S/T network module.
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 7-1.
| LED | Meaning |
|---|---|
B1 | Call active on B1 channel |
B2 | Call active on B2 channel |
This section provides information about the following network modules for Cisco modular routers:
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 7-8.) These ports are color-coded red.
Figure 7-9 shows LEDs for the 4-port BRI U network module. Figure 7-10 shows LEDs for the 8-port BRI U network module.
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 7-2. The third LED, labeled NT1, indicates synchronization status of the NT1.
| LED | Meaning |
|---|---|
B1 | Activity on B1 channel |
B2 | Activity on B2 channel |
NT1 | Synchronous status of NT1 |
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, NM-8B-U) and a digital modem network module (product numbers NM-6DM, NM-12DM, NM-18DM, NM-24DM, NM-30DM), your ISDN BRI network module may need to be upgraded to the minimum revision shown in Table 7-3.
Earlier revisions of the ISDN BRI network module cannot send modem calls to the digital modem network module.
| 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 7-3. 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
To order network module upgrades, see the "Cisco Connection Online" section.
Posted: Fri Jun 9 10:07:17 PDT 2000
Copyright 1989 - 2000©Cisco Systems Inc.
