GDC DeskTop 500A DSU
Universal Rate DSU for Branch Offices



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GDC DeskTop 500A DSU
Universal Rate DSU for Branch Offices

Highlights

•  Handles all digital service speeds from 2.4 to 64 Kbps for greater applications flexibility

•  Automatic data rate and interface selection for simple service upgrades

•  Powerful diagnostic testing capabilities for rapid fault isolation and system restoral

•  Extended dynamic range for the best performance possible

•  Anti-lockup feature for trouble-free clear channel operation

Description

The DeskTop 500A (DT-500A) is a universal rate data service unit (DSU) for remote site locations in digital networks. It supports all standard subrates and both 56 and 64 Kbps (clear channel) high speed rates. Designed for easy "plug-and-play" operation, the DT 500A simplifies both initial installation and any future service upgrades. This highly reliable, feature-packed product combines superior performance with a sleek, compact design that is perfect for any remote or satellite office environment.

Easy Installation and Maintenance

The DT 500A is configured using simple, clearly marked switches on the bottom of the unit. The optioning information is contained in a chart placed next to the option switches. There is no need to wrestle with complicated prompts or confusing menu trees, or plow through a detailed instruction manual. The unit can be preconfigured and then delivered to the remote site for plug-in installation.

Automatic Rate Selection Service upgrades are virtually transparent to the user -- including upgrades between subrates and from subrate to 56/64 Kbps operation. The unit automatically adjusts its operating rate to match the incoming signal and selects the appropriate V.35 or EIA/TIA-232E interface. There are no bulky and expensive adapter cables to buy and no need to change the unit's internal printed circuit board.

 

Powerful Diagnostics

The DT 500A includes a variety of features to ensure that system faults are quickly isolated and resolved. First, the unit can determine whether or not the transmit and receive pairs of the digital facility have been transposed. This feature alone will save hours of wasted troubleshooting.

Another unique capability is the Error Free Seconds (EFS) test, which can be set to run automatically (e.g., overnight). This allows the user to confirm that the service is performing within telephone company specifications.

The DT 500A also features three different Remote Digital Loopback (RDL) tests, ensuring diagnostic compatibility with many other 500-type DSUs. Tests are initiated via dedicated front panel push buttons, and the results are shown in an easy-to-read Electronic Display Window.

Superior Performance

The DT 500A includes GDC's Extended Dynamic Range feature that assures trouble-free operation, even over lines with very low signal levels, such as unusually long subscriber loops. In 64 Kbps clear channel operation, an anti-lockup feature protects against remote CSU/DSU lockup in permanent loopback -- a condition caused by data signals that look like in-band loopback command codes.

The DT 500A incorporates powerful VLSI and microprocessor technology, so it consumes very little power, resulting in low heat dissipation and longer component life for many years of reliable performance.

 

Specifications

 

 

COMPATIBILITY

 

Fully compliant with Bell Pub. 62310 and ANSI T1.410 standards
 

DATA RATES

Synchronous:  2.4, 4.8, 9.6, 19.2, 56 and 64 Kbps

Asynchronous:  1.2, 1.8, 2.4, 4.8, 9.6, and 19.2 Kbps
OPERATING MODE  

Conventional DDS:  Full duplex, point-to-point/multipoint

64 Kbps DDS:  Full duplex, point-to-point
 

DATA ENCODING

 

Bipolar, return to zero
 

DTE INTERFACE

 

ITU-T V.35 at 56 and 64 Kbps; EIA/TIA-232-E at 1.2 to 19.2 Kbps
 

DATA FORMAT

 

Synchronous:  Binary, serial

Asynchronous:  Binary, serial; 8, 9, 10 and 11-bit characters (  ITU-T V.14 compliant)
 

RTS/CTS DELAY (NOMINAL)

 

Normal

2.4 Kbps  8 milliseconds

4.8 Kbps   4 milliseconds

9.6 Kbps   2 milliseconds

19.2 Kbps  1 millisecond

56 Kbps  350 microseconds

64 Kbps  N/A

Extended  45 milliseconds
 

LINE REQUIREMENTS

 

4-wire, non-loaded metallic circuits
 

LINE IMPEDANCE

 

135 ohms (nominal)
 

TRANSMITTER TIMING

 

Internal, External or Network Timing
 

POWER REQUIREMENTS

 

 

105-129 VAC, 50/60 Hz, 8 W maximum
 

PHYSICAL CHARACTERISTICS

Height:  36 mm (1.4 in)

Width:  188 mm (7.4 in)

Depth:  279 mm (11.0 in)

Weight:  .35 kg (1.0 lbs)

Shipping Weight:  1.0 kg (2.2 lbs)

Operating Temperature:  0° to 50° C (32° to 122° F)

Humidity:  Up to 95% without condensation
SAFETY PROTECTION  

ETL Listed for U.S. and Canada


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