Cisco

Cisco SM25-56K4 | 4-wire 56 kbps DSU/CSU, DDS leased-line interface, RJ-48C, diagnostics loopbacks, for 2524/2525

SKU:SM25-56K4

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Description

Terminate 4-wire 56 kbps DDS leased lines directly on supported 2500-series routers with this integrated DSU/CSU module. Purpose-built for legacy private-line connectivity, it offers stable, low-bandwidth links for telemetry, out-of-band access, and point-to-point data transport, along with standard loopback diagnostics for simplified troubleshooting.

Features

- Direct 56 kbps DDS termination on the router
- Integrated diagnostics for quick circuit validation
- Stable low-bandwidth connectivity for legacy applications
- Compact, easy-to-deploy module
- Ideal for telemetry and OOB management links

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

Technical Specifications

- Interface type: 4-wire DDS DSU/CSU
- Line rate: 56 kbps (DS0)
- Loop type: 4-wire leased line
- Connector: RJ-48C
- Diagnostics: local and remote loopback support
- Use cases: telemetry, OOB management, point-to-point low-speed links
- Compatibility: 2524/2525 and selected 2500-series platforms

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