Cisco HWIC-4B-S/T – 4-Port ISDN BRI S/T WAN Card for ISR Routers
Model Name : HWIC-4B-S/T
Brand : Cisco
Key Features:
- BRI S/T Ports – Each supports 2B+D (up to 128 Kbps for B channels).
- TE or NT Mode – Enables both PBX and network-side connectivity.
- Voice & Data Support – Integrates with Cisco Unified Communications solutions.
- Compact Form Factor – Adds BRI to ISR without external equipment.
- RJ-45 Interfaces – Easily connect to BRI NT1 or PBX equipment.
- Ideal For – Voice gateways, ISDN PBX access, remote site connectivity, and legacy ISDN infrastructure.
30 days Warranty
Condition : Refurbished
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- Description
- Specification
- Reviews
Cisco HWIC-4B-S/T is a 4-port ISDN BRI S/T (Basic Rate Interface - S/T interface) High-Speed WAN Interface Card designed for Cisco Integrated Services Routers (ISR) including the 2800, 2900, 3800, and 3900 series.
Each port can be used for voice or data, supporting up to 2B+D channels per port.
It is commonly used in ISDN-based voice deployments, leased line replacements, and telecom interconnectivity where BRI is still relevant.
This module allows NT or TE mode configuration, making it highly adaptable for PBX, PSTN, or private ISDN environments.
Frequently Asked Questions
Q1: What routers are compatible with the HWIC-4B-S/T?
A: It is compatible with Cisco ISR 2800, 2900, 3800, and 3900 Series routers.
Q2: What is the total number of B channels?
A: The card supports 8 B channels total (2 per port × 4 ports), plus 4 D channels.
Q3: Can it be used for voice and data?
A: Yes. With the appropriate IOS voice license, it supports ISDN voice calls and data.
Q4: Does it require external NT1 devices?
A: No. It supports both NT and TE modes, depending on your deployment scenario.
Q5: Is the module hot-swappable?
A: No, you must power down the router before installing or removing it.
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