High Performance Multi Rate, 
Variable Speed CSU/DSU

Extended Temperature range - SEVERE ENVIRONMENT - DC Power
Now available with a power input option of 12, 24 or 48 VDC. The input floats so ground loops are eliminated. The input total power requirement is under 3.5 watts. Power input can be from solar cells or regular battery. Wide voltage swings can be tolerated - temperature range of -30 to +150 degrees Fahrenheit - power input option of 12, 24 or 48 VDC -

The VRL-1 Variable Speed CSU/DSU that allows users to connect to the Digital Network without making obsolete their existing equipment. The VRL-1 performs Bell compatible encoding and decoding, system timing, the proper interface and complete diagnostics in a small reliable package. The VRL-1connects to the digital network at speeds of 56K, 19.2K or 9.6 K. At the 19.2K and 9.6K speeds, the terminal speeds and the line speeds are the same. At 56K, the VRL-1 can operate at 56K terminal speeds or it can provide speed adaptation, allowing connected terminals to run at speeds less than 56K. Speeds of 1.2K through 38.4K are possible in this mode. 

BAT VRL-1 Variable Speed CSU/DSU

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The table on the Specifications  illustrates the products flexibility.  



Line Rate: 56K, 19.2K, 9.6K auto adaptive
Operating Modes: Dataphone Digital Service (DDS) in point to point or multi-point applications.
May also be used as Limited Distance Modem.
Standard Features: Slave and master timing.
Async operation.
Integral diagnostics.
Adaptable terminal side rates.
Both RS-232 and V.35 connectors and interfaces provided.
Test Features: Ten front panel status and test indicators. Front panel push button selects the following test modes: Self Test, Digital Loop, Local Loop, Remote Loop.
Responds to Bell defined CSU and DSU loop backs from the Central Office.
Internal test pattern generator.
AC Power: 117 VAC +/- 10%, 60 Hz, 12w
Environment: 0 to 50 C, up to 95% humidity.
Physical: Height..............2.50 In.
Width...............8.00 In.
Depth...............6.25 In.
Connectors: Both V.35 and RS-232 connectors and interfaces provided.
Operating Modes:
Mode 1: Telco Line Speed 56K
Terminal Config.: Speed Interface Sync Async
  56.0K V.35 / RS-232 YES NO
  38.4K V.35 / RS-232 YES YES
  19.2K V.35 / RS-232 YES YES
  9.6K V.35 / RS-232 YES YES
  4.8K V.35 / RS-232 YES YES
  2.4K V.35 / RS-232 YES YES
  1.2K V.35 / RS-232 YES YES
MODE 2: Telco Line Speed 19.2K
Terminal Config.: 19.2K V.35 / RS-232 YES YES
MODE 3 Telco Line Speed 9.6K
Terminal Config.: 9.6K V.35 / RS-232  YES YES
Data Format: Synchronous or Asynchronous (7/8 data bits one stop bit)
Interface: Standard registered RJ-48s jack on the rear panel.
RX Levels: Supports 40 db attenuation (exceeds requirements by 6 db).
Equalization: Automatic, no user adjustment needed.

301-924-7400 EXT 25 / 301-924-7400 EXT 25 / fax 301-924-7400 EXT 25

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