Cisco 2-Port Network Interface Module BRI (NT and TE) - VWIC ISDN S/T Interface Card

The Cisco 2-Port Network Interface Module BRI (NT and TE) is a high-performance Voice/WAN Interface Card (VWIC) engineered to deliver reliable ISDN Basic Rate Interface (BRI) connectivity for Cisco Integrated Services Routers. With two S/T interface ports and support for both NT and TE operating modes, this module provides flexible, cost-effective WAN and voice solutions for branch offices and enterprise deployments.

Advantages

This interface module enables simultaneous voice and data transmission over ISDN lines, offering up to 128 kbps per B-channel for efficient bandwidth utilization. Its dual-mode NT/TE capability ensures compatibility with various service provider configurations, simplifying network design and reducing hardware inventory. The plug-in form factor integrates seamlessly into Cisco ISR G1/G2 routers, making it an ideal choice for expanding connectivity without additional chassis space.

Suitable for

• Branch office connectivity requiring ISDN BRI WAN links
• Voice over IP (VoIP) and legacy voice services
• Dial-up access and backup WAN connections
• Video conferencing and fax transmission over ISDN

Key specifications

• Product Type: Voice/WAN Interface Card (VWIC)
• Interface Type: ISDN BRI (Basic Rate Interface)
• Number of Ports: 2
• Port Type: S/T Interface
• Operating Modes: NT (Network Termination), TE (Terminal Equipment)
• Signaling Protocols: ISDN Q.931, Q.921
• Data Transfer Rate: Up to 128 kbps per B-channel
• Connectivity Technology: Wired
• Form Factor: Plug-in module
• Connectors: 2 x RJ-45
• Compatibility: Cisco ISR G1/G2 Routers (e.g., 2800, 2900, 3800, 3900 Series)
• Management: Cisco IOS Command Line Interface (CLI)
• Hot Swappable: No
• Standards Compliance: TIA/EIA-606, ITU-T I.430, ETSI 300 012

Recommendations

For optimal performance, ensure your Cisco router is running a compatible Cisco IOS version and that the module is installed in a supported slot. Verify ISDN line provisioning with your service provider to match NT or TE mode requirements. This module is not hot-swappable; power down the router before installation or removal.