Motorola MR64 DSU/CSU

Designed for use on the Digital Data Service (DDS) network, the Raymar-Telenetics DDS/MR64 combines the functions of a DSU and CSU into a single unit. It operates in either point-to-point or multipoint applications, transmitting synchronous data at rates from 2,400 bps to 64,000 bps clear channel, and asynchronous data from 2400 bps to 57,600 bps. The DDS/MR64 complies with Bell publications 62310 and 41450 and is directly compatible with Bell 500 series DSU and CSU equipment.

In addition to DDS network operation, the DDS/MR64 can operate as a limited distance modem, providing serial, full-duplex transmission at the rates listed over private 4-wire unloaded twisted-pair cable systems. The maximum distance is a function of data rate and wire size.