Motorola MR64

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.

  • High speed asynchronous capability operating at 38,400 and 57,600 bps on 56K lines allows direct connection of high speed asynchronous DTEs to DDS lines.
  • Switchable EIA-232 and CCITT V.35 interface allows a single model to provide both interfaces.
  • Provides highly reliable digital performance on both conventional DDS networks or as a limited distance modem, so that one model can be used for either interstate or interoffice communications.
  • Operates at all DDS line rates from 2,400 bps to 64,000 bps including 19,200 bps to accommodate a wide range of DTE devices.
  • Automatic line equalization compensates for distortion and attenuation caused by line length without user adjustment.
  • Convenient front panel LCD control allows viewing current configuration and status without causing an interruption of data.
  • Saves operating configuration to nonvolatile memory, eliminating having to setup every time the unit is turned on.

The DDS/MR64 can be configured and diagnostic testing performed through the front panel pushbuttons and 32-character LCD. The LCD and LEDs also display data rate, test information, and network status information non-intrusively. Once the DDS/MR64 has been configured via the front panel and the settings saved in non-volatile memory, the front panel can be disabled with a hardware strap inside the unit for security purposes.

The DDS/MR64 DTE interface can be switch-configured to be either EIA-232 or V.35. The DDS/MR64 also provides external-clocked transmit data buffering to simplify tail-circuit applications.