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- Description
- Specifications
The Cisco NM-4B-U adds four ISDN BRI ports with an integrated Network Termination 1 (NT1), the U interface, to a router. The module is known as the 4-port BRI U network module and as CPANM-4B-U.
Each port is an RJ-45 jack colored red. A straight-through RJ-45-to-RJ-45 cable runs from the port to an RJ-45 ISDN jack. Along with the module enable (EN) LED, every port has three LEDs: B1 and B2 for activity on the two B channels, and NT1 for the synchronization status of the NT1.
Supported routers are the Cisco 2600 series, 2811, 2821, 2851, 3600 series, 3700 series and 3800 series. On a 3600 series router with a digital modem network module (NM-6DM, NM-12DM, NM-18DM, NM-24DM or NM-30DM), the NM-4B-U must be revision 800-01238-06 or higher. A board number lower than -06 means the module needs an upgrade, and earlier revisions cannot send modem calls to the digital modem module. A PRI network module goes in the same chassis only on Cisco IOS Release 11.3(3)T or later. The Cisco interface cards range lists other BRI and WAN network modules.
Related part: NM-8B-U Cisco 8-Port ISDN BRI Network Module with NT1, U Interface
| Part number | NM-4B-U |
| Type | 4-port ISDN BRI network module with integrated NT1 |
| Interface | U |
| NT1 | Integrated |
| Ports | 4 x RJ-45, red |
| Cable | Straight-through RJ-45 to RJ-45 |
| LEDs | EN, plus B1, B2 and NT1 for each port |
| Minimum revision with digital modem modules | 800-01238-06 |
| Other name | CPANM-4B-U |
| Compatible with | Cisco 2600 series, 2811, 2821, 2851, 3600 series, 3700 series, 3800 series routers |