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:

Features to query the network module
Traps to monitor the network module
Integration with CiscoWorks and CiscoView management tools
ISDN MIB support
Support POTS call redirection to Internal Digital Modems

**Table 17-236: 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 17-126: 4-Port ISDN BRI with NT1 Network Module (U Interface), NM-4B-U

Cables: RJ-45 to RJ-45 straight-thru cables provided by the customer

Figure 17-127: 4-Port ISDN BRI Network Module (S/T Interface), NM-4-S/T

Cables: RJ-45 to RJ-45 straight-thru cables provided by the customer

Figure 17-128: 8-Port ISDN BRI Network Module (S/T Interface), NM-8B-S/T

Cables: RJ-45 to RJ-45 straight-thru cables provided by the customer

Figure 17-129: 8-Port ISDN BRI with NT1 Network Module (U Interface), NM-8B-U

Cables: RJ-45 to RJ-45 straight-thru cables provided by the customer

Table of Contents

4- and 8-Port ISDN BRI Network Modules

4- and 8-Port ISDN BRI Network Modules