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ADCP-80-353 • Issue 2 • August 2002 • Section 2: Installation
2.2.2
Operational
The DSX-3 (DSX-4U-24) Rear Cross-Connect System must be operated in ambient
temperatures and humidities which do not exceed the following:
• Temperature: –40° to +65° C (–40° to +149° F).
• Relative Humidity: 0% to 95% without condensation.
2.3
Power
The cross-connect system operates on –48 Vdc filtered office battery, fused or breakered at the
office distribution panel. Approximate current requirements can be calculated based on 10
milliamps for each lit LED tracer lamp. The number of tracer lamps lit at any one time will
depend on local patching and testing procedures. The fuse panel, just below the upper wire
trough, at the top of the bay provides a 0.5 Amp. fuse for each DSX-4U chassis in the bay.
2.4
Cable Types and Lengths
All coaxial cables should be 75 ohm coaxial with tinned copper shield (735A/734A or
equivalent).
The digital equipment terminated at the cross-connect system bay must have equalizers and/or
pads which are adjusted for the particular cable lengths to maintain the proper transmission
levels. The maximum length between digital equipment and the bay is governed by the specific
item of equipment and cable type. See
information.
NETWORK
ELEMENT
(NE)
2.048, 8.448
34.368, 51.84, 139.264
155.52
Mbps
Page 2-2
© 2002, ADC Telecommunications, Inc.
Mbps
2.25 dB
0.50 dB
Mbps
0.75 dB
5.0 dB
0.75 dB
5.35 dB
2.048, 8.448 Mbps
34.368, 51.84, 139.264
155.52
Mbps
Figure 2-1. Coaxial Cable Lengths and Losses
Figure 2-1
and
Table 2-1
EQUIPMENT CABLES
CROSS-CONNECT JUMPERS
DSX
DSX
0.50 dB
0.50 dB
0.75 dB
0.50 dB
0.50 dB
0.75 dB
6.0 dB TOTAL
12.0 dB TOTAL
Mbps
12.7 dB TOTAL
for detailed cable length
NETWORK
ELEMENT
(NE)
2.25 dB
5.0 dB
9213-B
5.35 dB
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