Cisco NM-4B-S/T 4-Port ISDN BRI S/T Network Module
Model Name : NM-4B-S/T
Brand : Cisco
Key Features:
- 4 ISDN BRI S/T ports (Basic Rate Interface - 2B+D)
- S/T interface – requires external NT1 devices
- Ideal for voice/data integration, ISDN dial backup, and teleworker solution
- Compatible with Cisco 2600, 3600, and 3700 Series routers
- Supports data, video, and voice applications over ISDN
- Suitable for small to medium-sized businesses and branch offices
Network Module (NM) form factor
30 days Warranty
Condition : Refurbished
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- Description
- Specification
- Reviews
Cisco NM-4B-S/T is a 4-port ISDN BRI (Basic Rate Interface) S/T network module designed for Cisco modular routers including the 2600, 3600, and 3700 series.
It provides four S/T interface BRI ports for connecting to the Integrated Services Digital Network (ISDN), delivering digital WAN connectivity ideal for voice, video, and data services.
This module is ideal for branch office connectivity, backup WAN links, and small business telecommunication systems.
FAQ – Frequently Asked Questions for Cisco NM-4B-S/T
Q1: What is the difference between S/T and U interfaces?
A: S/T interfaces require an external NT1 device, while U interfaces have the NT1 integrated.
Q2: Can this module be used for voice and data applications?
A: Yes. It supports both voice and data transmission over ISDN BRI.
Q3: Which routers is the NM-4B-S/T compatible with?
A: It is compatible with Cisco 2600, 3600, and 3700 series routers.
Q4: Is NT1 included in this module?
A: No. External NT1s are required for S/T interfaces.
Q5: What type of cable is used?
A: Standard RJ-45 cables for S/T interface connectivity.
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