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Table of Contents

4- and 8-Port ISDN BRI Network Modules

4- and 8-Port ISDN BRI Network Modules

Four versions of BRI network modules are available. Each 4- and 8-port module has the option of an S/T interface or an onboard NT1 for each port. These modules are installed in the network module slot of a Cisco 2600 series or Cisco 3600 series router. Local SRAM is used for buffer descriptors and input queues. The 4-port module is not field upgradeable to the 8-port module.

With all eight BRI ports running continuous data (144 kbps each) and 50-byte packets, the maximum performance possible is 5760 pps and an aggregate full-duplex data rate of 2.3 Mbps.

The ISDN BRI network modules support the following features:

Table 5-164:
Table 5-164: Platform Support and Minimum IOS Release

Product Number

Cisco 2600

Cisco 3620/40

Cisco 3660

NM-4B-S/T

NM-4B-U

NM-8B-S/T

NM-8B-U

11.3(4)T

11.1(7)AA

Q1CCY2000


Figure 5-150: 4-Port ISDN BRI with NT1 Network Module (U Interface), NM-4B-U

Figure 5-151: 4-Port ISDN BRI Network Module (S/T Interface), NM-4-S/T

Figure 5-152: 8-Port ISDN BRI Network Module (S/T Interface), NM-8B-S/T

Figure 5-153: 8-Port ISDN BRI with NT1 Network Module (U Interface), NM-8B-U

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Posted: Mon Nov 8 16:53:07 PST 1999
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