Cisco NM-4B-S/T Cisco network interface module
Brand: Cisco | Category: Accessories & Components
SKU: CSC-NM-4B-ST | Part #: NM-4B-S/T | MPN: NM-4B-S/T
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About the Cisco NM-4B-S/T Cisco network interface module
The Cisco NM-4B-S/T Cisco network interface module from Cisco is enterprise-grade Accessories & Components hardware built for data centers. The Cisco NM-4B-S/T is a four-port ISDN BRI S/T network module designed for installation in Cisco modular access routers, including the Cisco 2600, 3600, and 3700 series platforms. Each of the four independent BRI S/T ports delivers a standard 2B+D channel structure, providing two 64 Kbps bearer channels and one 16 Kbps signaling channel per interface, for an aggregate of up to 512 Kbps of usable bearer bandwidth across all four ports when all B-channels are active. The S/T i Available in brand new condition. Cisco accessories & components products are trusted by enterprises and data centers worldwide. Available from Omnixon Global. Contact our sales team to request a quote.
Technical Specifications
| Brand | Cisco |
| Category | Accessories & Components |
| SKU | CSC-NM-4B-ST |
| Part Number | NM-4B-S/T |
| Condition | New |
| Manufacturer Part Number | NM-4B-S/T |
| Product Type | Network Module |
| Form Factor | Network Module (NM) for Cisco modular access routers |
| Compatible Platforms | Cisco 2600 series, 3600 series, 3700 series modular access routers |
| Number of WAN Ports | 4 |
| Interface Type | ISDN BRI S/T (4-wire S/T reference point) |
| ISDN Channel Structure per Port | 2B+D (2 x 64 Kbps bearer + 1 x 16 Kbps signaling) |
| Bearer Channel Bandwidth per Port | 128 Kbps (both B-channels active) |
| Aggregate Bearer Bandwidth (all ports) | Up to 512 Kbps |
| Supported ISDN Switch Types | National ISDN-1, AT&T 5ESS, Nortel DMS-100, Euro-ISDN (NET3/ETSI) |
| NT1 Requirement | External NT1 required for North American PSTN connection; not required for native S/T bus (European) |
| Connector Type | RJ-45 |
| Supported WAN Protocols | PPP, Multilink PPP (MLP), HDLC, Frame Relay over ISDN, X.25 |
| Dial Features | Dial-on-demand routing (DDR), dial backup, bandwidth-on-demand |
| Management | Cisco IOS Software (host router); full IOS CLI and SNMP management |
| TAC Support Eligibility | Genuine Cisco hardware — eligible for Cisco TAC support validation |
| Hardware Authenticity | Genuine Cisco-manufactured module |
Frequently Asked Questions about Cisco NM-4B-S/T Cisco network interface module
What does the Cisco NM-4B-S/T Cisco network interface module do?
The Cisco NM-4B-S/T Cisco network interface module is enterprise IT hardware deployed in production data centers, server rooms, and edge sites across the GCC and EMEA region.