United States$5,000,000+
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E
Evan Mitchell
5
ISDN BRI module delivered stable connectivity.
NM-4B-S/T
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4Port ISDNBRI Network Module Cisco Router Network Module
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Name:
NM-4B-S/T
- Description:
- 4Port ISDNBRI Network Module Cisco Router Network Module
- Rating:
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In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 818217063721
- Condition:
3 Year Extended Warranty
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NM-4B-S/T Overview
NM-4B-S/T is a high-performance Ethernet module designed for robust enterprise networking solutions. It features four integrated RJ-45 ports that support data rates of up to 1Gbps per port, and it seamlessly integrates with routers, switches, and servers using standardized TCP/IP and UDP protocols.
NM-4B-S/T is built with a PCIe form factor for easy installation and reliable performance in data centers and enterprise environments. Its optimized design ensures efficient network connectivity for expanding infrastructure capacity, upgrading server interfaces, and connecting to high-speed networks.
NM-4B-S/T price is is available on request. Get immediate quote.
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NM-4B-S/T Specifications
- Power Consumption
- N/A
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Expansion Slots
- N/A
- Data Rate
- 1Gbps
- Connector Type
- RJ-45
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Product Type
- Network Module / Network Card
- Module Type
- Ethernet
- Interface Ports
- Ethernet
- Supported Features
- Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS
- Form Factor
- PCIe
- Max Speed
- 1Gbps
- Compatibility
- Routers, Switches, Servers
- Supported Protocols
- TCP/IP, UDP
- Product Name
- NM-4B-S/T
NM-4B-S/T Use Case
High-Availability WAN Backup for Financial Trading Platforms
In a global financial services firm, the Cisco NM-4B-S/T-4Port ISDN BRI Network Module in ISR routers provides a dedicated ISDN BRI backup link for mission-critical trading systems. Automated MLPPP failover delivers sub-second switchover on MPLS or broadband outages, ensuring uninterrupted order execution and market data access. Outcome: Achieves 99.999% uptime, prevents revenue loss during connectivity disruptions, and upholds regulatory SLAs.
Cost-Effective Branch Office Voice and Data Convergence
A nationwide retail chain deploys the NM-4B-S/T-4Port ISDN BRI Module on Cisco routers at 200 remote outlets to unify PBX voice trunks and data backup on a single platform. Centralized Cisco IOS management and ISDN BRI integration reduce hardware footprint by 30% and simplify WAN operations. Outcome: Streamlines branch deployments in under two weeks, lowers OPEX, and enhances network reliability.
Secure Emergency Call Routing for Healthcare Networks
A regional hospital network leverages the Cisco NM-4B-S/T-4Port ISDN BRI Module to establish resilient PSTN voice channels for emergency services. Integrated with Cisco Unified Communications, it provides encrypted call paths and rapid dial-tone failover when IP links degrade. Outcome: Ensures fail-safe emergency call delivery, safeguards patient safety, and aligns with healthcare compliance standards.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| NM-4B-S/T |  EM2-HDA-4FXO |  NM-HD-2V |  SM-D-ES3G-48-P |  NME-X-23ES-1G | |
|---|---|---|---|---|---|
| Product Type | Network Module / Network Card | WAN Module | Network Module / Network Card | Network Module | Ethernet Module |
| Module Type | Ethernet | FXO Analog Telephony | Ethernet | Ethernet | Ethernet |
| Data Rate | 1Gbps | N/A | 10Gbps | 1Gbps | 1G |
| Connector Type | RJ-45 | RJ-11 | SFP+ | RJ-45 | RJ-45 |
| Supported Protocols | TCP/IP, UDP | SIP / SS7 | TCP/IP | TCP/IP | TCP/IP |
| Form Factor | PCIe | Modular | PCIe | Modular | PCIe |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Routers, Switches, Servers | Cisco / Juniper / Dell | Cisco / Juniper / Arista | Cisco, Juniper, Arista, Dell, HP | Cisco / Juniper / Arista / Dell / HP |
| Max Speed | 1Gbps | N/A | 10Gbps | 1Gbps | 1Gbps |
| Supported Features | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Echo Cancellation / Caller ID / Call Waiting | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation / Wake-on-LAN / Jumbo Frames |
| Power Consumption | N/A | N/A | 15W | 45W | 5W |
| Interface Ports | Ethernet | FXO | SFP+ | Ethernet | Ethernet |
| Expansion Slots | N/A | NIM | NIM | N/A | N/A |
| Product Name | NM-4B-S/T | EM2-HDA-4FXO | NM-HD-2V | SM-D-ES3G-48-P | NME-X-23ES-1G |
| Height | N/A | N/A | 1.2 inches | N/A | N/A |
| Width | N/A | N/A | 4.7 inches | N/A | N/A |
| Depth | N/A | N/A | 0.8 inches | N/A | N/A |
| Weight | N/A | N/A | 1.5 lbs | N/A | N/A |
Reviews & Ratings
H
Hooria Latif
5
Clear signaling and reliable operation.
J
Jan Kowalski
4
Installed easily and worked as expected.
D
Daphne Ross
5
Good choice for legacy ISDN needs.
B
Bilal Ahmad
5
Dependable Cisco module.
Questions & Answers
What is the Cisco NM-4B-S/T 4-Port ISDN BRI Network Module?
The NM-4B-S/T is a Cisco router interface module that delivers four ISDN BRI ports for integrated voice and data services on supported Cisco platforms.
Which Cisco routers support the NM-4B-S/T 4-Port ISDN BRI module?
The NM-4B-S/T is compatible with Cisco Integrated Services Routers such as the 1800, 2800 and 3800 series, as well as legacy 2600, 3600 and 3700 platforms.
How do I install the NM-4B-S/T on my Cisco router?
Power down the router, remove the blank faceplate, insert the NM-4B-S/T into an available network module slot, secure with captive screws, and then power the router up.
What key features does the 4-Port ISDN BRI Network Module offer?
It provides four independent 2-B+D channels, hardware NT/TE switching, QoS support, and low-latency voice/data integration over a single module.
What bandwidth does each ISDN BRI port support?
Each BRI port supports two 64 kbps B-channels and one 16 kbps D-channel for a total of 144 kbps per port.
Can the NM-4B-S/T handle simultaneous voice and data calls?
Yes. The module’s dual B-channels allow concurrent voice and data sessions on each ISDN BRI interface.
How do I configure an ISDN BRI interface on the Cisco router?
In global config mode, enter interface bri <slot>/<port>, set the switch-type, assign an IP or dialer profile, and enable keepalive commands.
What are the advantages of ISDN BRI over analog PSTN lines?
ISDN BRI delivers faster call setup, guaranteed E1/T1-like digital quality, integrated voice/data channels, and call-by-call switching at 128 kbps.
How can I verify the operational status of the ISDN BRI ports?
Use the commands show isdn status and show interface bri <slot>/<port> to display D-channel status, B-channel activity and error counters.
Does the NM-4B-S/T support both NT and TE modes?
Yes. A built-in NT/TE switch allows you to configure each ISDN BRI port as either network-terminated (NT1) or terminal equipment (TE).
What is the typical power consumption of the 4-Port ISDN BRI module?
Under normal load, the NM-4B-S/T draws approximately 5 W from the router’s power supply.
Will the NM-4B-S/T impact overall router performance?
No. The module offloads ISDN channel processing in hardware, preserving the router’s main CPU cycles for other tasks.
Where can I download the required Cisco IOS for ISDN BRI support?
Authorized users can obtain IOS images from the Cisco Software Download Center under the router’s product page; a valid service contract is required.
What are common troubleshooting steps for ISDN BRI connectivity issues?
Verify S/T cable wiring, confirm switch-type settings, check D-channel synchronization with show isdn status, and enable debug isdn q921 for diagnostics.
Is an external CSU/DSU required for the Cisco 4-Port ISDN BRI module?
No. The NM-4B-S/T provides built-in NT1 termination for direct connection to the ISDN network; only a standard S/T-cable is needed.