64, 56, 19.2, 9.6, 4.8, 2.4 and 1.2 kbps over 
DDS point-to-point and multipoint applications.


Direct connect compatibility for 64, 56,19.2, 9.6, 4.0, 2.4 and 1.2 kbps

Compatible with Bell 500A and 500B DSU

Interchangeable EIA RS232-C, CCITT V.35, or EIA RS-530/RS449 type DTE interfaces

Provides simple configuration of options and diagnostics through front panel push buttons and LCD display

Automatic line equalization

Synchronous data format for 64 and 56 kbps operation

Synchronous or asynchronous data formats available for 19.2, 9.6, 4.3, 2.4, and 1.2 kbps

Externally-clocked transmit data buffering for use in tail circuit applications

Integral diagnostics

Universal Data Shelf compatible

The UDS DDS/MR1 is a multi-rate DSU/CSU. It provides data transfer at rates from 1.2 up to 64 kbps over the DDS network. The model combines the functions of a Data Service Unit with the functions of a Channel Service Unit.


 Designed for use on the Digital Data Service (DDS) network, the UDS DDS/ MR1 combines the functions of the Data Service Unit (DSU) with the Channel Service Unit (CSU) into a single compact unit. The DDSMR1 complies with the requirements specified in Bell publications 62310 and 41450 and is compatible with the UDS D56 and D19.2. The model provides full duplex, serial communications at 64, 56, 19.2, 9.6, 4.8, 2.4 and 1.2 kbps over 4-wire unloaded twisted-pair cable systems and DDS point-to-point and multipoint applications. The model also functions as a limited distance modem with the distance between units being a function of the data rate and wire size.

Installation of the DDS/MR1 is simplified by the integral CSU which provides the necessary equalization and line conditioning. A DB-25 type connector is used to connect the data terminal equipment to the DDS/MR1. If the model is equipped with CCITT V.35 interface circuitry, an optional external adapter module provides a 34 pin V.35 connector.

The ten character liquid crystal display (LCD) front panel of the DDS/MR1 allows simplified option configuration and diagnostic testing. The LCD display and LEDs provide the user with data rate, test information, and network status. Once the unit has been configured and the settings saved in non-volatile memory, the front panel can be disabled using a hard strap located on the printed circuit board. With the front panel disabled, the user can only view the current settings and tests can be initiated only through the DTE port 

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