Cisco HWIC-1DSU-T1 T1/Fractional T1 WAN Card

BRAND NEW. FACTORY SEALED. FULL CISCO WARRANTY INCLUDED. MANUFACTURED BY CISCO. FROM CHICAGO COMPUTER SUPPLY

Overview

The Cisco HWIC-1DSU-T1 is a one-port T1 and Fractional T1 WAN interface card designed for enterprise and branch router deployments that require stable, circuit-based connectivity. It integrates a full CSU/DSU directly into the module, reducing hardware complexity while improving operational visibility.

By combining WAN access and line termination in a single HWIC, this module simplifies deployment, monitoring, and troubleshooting in environments that still rely on T1 infrastructure.

Key Features

• Single-port T1 and Fractional T1 WAN connectivity
• Integrated CSU/DSU for simplified network design
• Unified management through the router as one SNMP entity
• Built-in diagnostics, including loopbacks and self-tests
• Supports legacy WAN and enterprise routing use cases
• Plug-in HWIC form factor for rapid installation

Technical Specifications

Device Type: WAN Interface Expansion Module

Model: HWIC-1DSU-T1

Form Factor: Plug-in Module

Interface: 1 × T1 / Fractional T1 WAN

Data Rate: 1.544 Mbps (T1 / FT1)

Protocols: HDLC

Integrated Functions: CSU/DSU

UPC: 00882658146701

Use Cases

The Cisco HWIC-1DSU-T1 works best in branch offices and remote sites that depend on dedicated T1 or Fractional T1 circuits for stable, predictable WAN connectivity. It is ideal for organizations that require reliable, carrier-provided leased lines while maintaining centralized router management. Businesses often use this module in financial institutions, healthcare networks, government sites, and distributed enterprise environments where uptime, monitoring, and consistent bandwidth are critical.

It also supports cost-controlled deployments through Fractional T1 configurations, allowing companies to provision only the bandwidth they need while retaining the option to scale. In legacy and hybrid infrastructures, the integrated CSU/DSU simplifies design by eliminating external hardware, making it a practical solution for environments that still rely on circuit-based WAN connectivity alongside modern IP networks.

Why Choose Cisco HWIC-1DSU-T1 

• Eliminates the need for external CSU/DSU hardware
• Simplifies WAN troubleshooting and monitoring
• Reduces rack space and power consumption
• Maintains compatibility with legacy T1 infrastructure
• Trusted Cisco hardware for long-term deployments

FAQs

What does the HWIC-1DSU-T1 do?

It provides a single T1 or Fractional T1 WAN connection with a built-in CSU/DSU for Cisco routers.

Why is an integrated CSU/DSU important?

It simplifies management, reduces hardware failures, and allows unified monitoring through the router.

Does it support Fractional T1?

Yes. It supports both full T1 and Fractional T1 configurations.

What troubleshooting features come with the Cisco HWIC-1DSU-T1?

The module supports self-tests, loopbacks, alarms, CSU/DSU resets, and detailed T1 statistics.

Is this suitable for modern networks?

Yes. It is ideal for hybrid environments where T1 links still coexist with IP-based infrastructure.