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GDC DeskTop 56/64 DSU

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  301-924-7400 Support

GDC DeskTop 56/64 DSU 048A101-001


The DeskTop 56/64 is a low cost, high performance and high quality data service unit (DSU) aesthetically designed for office environments.  It supports 56 Kbps and 64 Kbps clear channel high speed data rates in standard digital point-to-point or multipoint networks. It is also a cost-effective data service unit for point-to-point limited distance applications.  Designed for easy, plug-and-go
installation, the DT 56/64 unit simplifies initial installation and future service upgrades.  This highly reliable, user-friendly product combines superior performance with a sleek, compact design that blends well with any surroundings.

The DT 56/64 unit is line compatible and diagnostic-test compatible with GDC’s other DSU products, including the SpectraComm 500A designed for central sites. It is also line compatible with non-GDC DSUs operating at 56/64 Kbps that are compliant with the Bell Publication 62310.


The DT 56/64 is configured using simple, clearly marked switches on the bottom of the unit. An optioning information chart is also provided on the bottom of the unit. There is no need to wrestle with complicated prompts, confusing menu trees or lengthy instruction manuals. To make things even simpler, the unit can be preconfigured at a central site and then delivered to remote sites for plug-in installation.

tests, ensuring diagnostic compatibility with many other DSUs. These tests include a GDC standard remote loopback test, a V. 54 loopback test, and a PN 127 loopback test. Additionally, the DT 56/64 supports carrier-initiated CSU and DSU loopback tests. Self-test, line loopback and remote loopback tests can be conducted using either a 511 or a 2047 internal bit test pattern.  Tests are initiated via dedicated front panel pushbuttons with associated LEDs indicating the test in progress. Any errors detected are
instantly visible through appropriate flashing LEDs.


The DT 56/64 includes an Extended Dynamic Range feature that assures trouble-free operation, even over lines with very low signal
levels, such as unusually long subscriber loops.  An anti-lockup feature protects against remote DSU or OCU lockup (a permanent loopback) of 64 Kbps circuits from data signals that look like inband loopback command codes. When optioned for multipoint applications, the DT 56/64 DSU supports an antistreaming feature that automatically times out remote units with RTS On for 20 seconds.  The DT 56/64 incorporates the latest VLSI and microprocessor technology, so it consumes very little power, resulting in low heat dissipation and longer component life for years of reliable performance.


With a MTBF (Mean Time Between Failures) of 590,000 hours, the DeskTop 56/64 continues GDC’s reputation for transmission
products of the highest quality.


The DT 56/64 features three different Remote Digital Loopback (RDL)



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