Cross-Connect Cable Type, Length, And Levels - ADC DSX-1 Quick Start Manual

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2. CROSS-CONNECT CABLE TYPE, LENGTH, AND LEVELS

A. Cable Types

2.01 All DS-1, DS-1C, and DS-2 cables should be

shielded twisted pair with the shields grounded at one

end only (preferably the equipment end). The recom-

mended cable types are:

• DS-1, 655 feet (200 m): AT&T 600C or equivalent.

• DS-1, 450 feet (137 m): AT&T 1249 or equivalent.

• DS-1C, 655 feet (200 m): AT&T 600C or equivalent.

• DS-2, 1050 feet (320 m): AT&T 600C or equivalent.

B. Cable Length and Gauge

2.02 The digital equipment terminated on the DSX

frames have equalizers and/or pads which are adjusted

for the particular cable lengths to maintain the proper

transmission levels. The maximum cable length be-

tween digital equipment and DSX frames are governed

by the specific items of equipment and cable gauges as

follows:

• DS-1 and DS-1C, 22 AWG: 655 feet (200 m).

• DS-2, 22 AWG: 1050 feet (320 m).

C. Signal Levels

2.03 Each DSX frame serves as an equal level trans-

mission point, and all digital signals crossing a DSX

frame must be maintained within a certain voltage

range for each specific bit rate. The peak-to-base volt-

age ranges for DSX frames are:

• DSX-1: ± 2.4 to 3.6 volts (± 3.0 volts, nominal).

• DSX-1C: ± 2.3 to 4.2 volts (± 3.0 volts, nominal).

• DSX-2: ± 0.55 to 1.3 volts (± 1.0 volt, nominal).

ADCP-80-348

Issue 1, May 1995

Page 2

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