Cabletron 15P1305B-1 V.35 Modem 1.544 Mbps T1 DSU/CSU RJ-48C

Cabletron 15P1305B-1 V.35 Modem 1.544 Mbps T1 DSU/CSU RJ-48C

The Cabletron 15P1305B-1 is a V.35 modem designed for T1 and fractional T1 data communications networks. This unit provides a DSU/CSU (Data Service Unit / Channel Service Unit) interface, enabling connection of networking equipment to T1 lines at 1.544 Mbps data rate. The modem features an RJ-48C connector for T1 line connection and V.35 interface for device connectivity, making it suitable for point-to-point and multipoint network applications in telecommunications and enterprise networking environments.

Specifications & What's Included

• Model: Cabletron 15P1305B-1
• Interface Type: V.35 Modem / T1 DSU/CSU
• Data Rate: 1.544 Mbps (T1 speed)
• Connector Type: RJ-48C (T1 line interface)
• Protocol Support: T1 ESF, Fractional T1 (FT1)
• Standards Compliance: ANSI T1.403, ITU G.703
• Primary Function: Data Service Unit / Channel Service Unit for T1 connectivity
• Typical Applications: WAN links, remote office connectivity, data center networking

Applications

V.35 modems like the Cabletron 15P1305B-1 are used to bridge T1 leased lines and local area network equipment. Historically deployed throughout the 1990s and 2000s in enterprise networks, these DSU/CSU devices convert T1 signals to V.35 format for compatibility with routers, multiplexers, and other networking equipment. The T1 standard (1.544 Mbps) became the backbone of North American telecommunications infrastructure and remains in use today for legacy system maintenance, disaster recovery, and connectivity in remote locations where T1 lines are still available. This modem type is essential for organizations maintaining older networking infrastructure or requiring reliable point-to-point WAN connections.