CHAPTER
Connecting ISDN BRI Network Modules to a Network 7-1
7
Connecting ISDN BRI Network
Modules to a Network
This chapter describes how to connect Integrated Services Digital Network (ISDN) Basic
Rate Interface (BRI) network modules in Cisco modular routers, and describes the
following:
• Upgrading ISDN BRI Network Modules on page 7-1
• 4-Port and 8-Port ISDN BRI S/T Network Modules on page 7-3
• 4-Port and 8-Port ISDN BRI U Network Modules on page 7-6
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.
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, 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 has to be upgraded to the minimum version shown in Table 7-1.
Earlier versions of the ISDN BRI network module cannot send modem calls to the digital
modem network module.
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