ADC DSX-1 - Cross-Connect Cable Type, Length, and Levels

ADCP-80-348
Issue 1, May 1995
Page 2
© 1995, ADC Telecommunications, Inc.
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).