Motorola UDS DDS-MR64



Our LIKE NEW DDS/MR64 units are normally available.  They come with a new factory box, manuals (or CD) and cables. They have an extended one year warranty.

Our refurbished and used units are also immediately available. They may show some cosmetic signs of use. They come with a 30 or 90 day warranty.

The specs are well outlined below for your review.

Product Specifications:

High speed asynchronous capability operating a 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 2400 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 dam.

Saves operating configuration to nonvolatile memory, eliminating having to setup every time the unit is turned on.

Motorola DDS-MR64 DDS/MR64 DDSMR64 MR64

Data Rates (DDS network)
2400, 4800, 9600, 19200, 56000 or 64000 bps synchronous (up to clear channel 64); 2400, 4800, 9600, 19200, 38400, or 57600 bps asynchronous

Data Rates (4-wire, private networks)
2400, 4800, 9600, 19200, 56000, or 64000 bps synchronous; 2400, 4800, 9600, 19200, 38400, or 57600 bps asynchronous

Operating Mode
DDS full-duplex, multipoint; DDS full-duplex point-to-point; 4-wire full-duplex; 4-wire half-duplex or simplex Data Format Serial binary, synchronous, asynchronous

Data Encoding
Bipolar, return-to-zero, per Bell System Publication 62310

DDS; external; internal

Transmission Facility
Unloaded metallic circuits, 19 to 26 gauge

System Impedance
Line receiver input impedance: 135 ohms ±10% Transmit pair output impedance: 135 ohms ±10%

Output Signal
0.7854 ±0.05 volts across 135 ohms at 9.6 kbps 1.4 ±0.1 volts across 135 ohms at all other rates


Data Rate Typical Delay
(kbps) (ms)
64 0.6
56 0.6
19.2 1.2
9.6 2.2
4.8 4.2
2.4 8.2
Digital Interface

Power Requirements

110 VAC, 47 – 63 Hz

Power Consumption
5 watts nominal

0′ – 50′ C; 95% humidity, noncondensing