12.4 Installing Cables
This section describes the procedures and precautions to be taken for installing PGND cables,
power cables, transmission cables, monitoring signal cables or alarm cables, and CPRI cables
when a DBS3900 is deployed in a 19-inch rack.
12.4.1 Cabling Requirements
Cables must be routed according to the specified cabling requirements to prevent signal
interference.
NOTE
If a cable listed below is not required, skip the routing requirements of the cable.
General Cabling Requirements
The bending radius of the cables must meet the following specifications:
l The bending radius of the 7/8'' feeder must be more than 250 mm (9.84 in.), and the bending
radius of the 5/4'' feeder must be more than 380 mm (14.96 in.).
l The bending radius of the 1/4'' jumper must be more than 35 mm (1.38 in.). The bending
radius of the super-flexible 1/2'' jumper must be more than 50 mm (1.97 in.), and the bending
radius of the ordinary 1/2'' jumper must be more than 127 mm (5 in.).
l The bending radius of the power cable or PGND cable must be at least five times the
diameter of the cable.
l The bending radius of an fiber optic cable is at least 20 times the diameter of the fiber optic
cable.
l The bending radius of the E1/T1 cable must be at least five times the diameter of the cable.
l The bending radius of the signal cable must be at least five times the diameter of the cable.
The cables must be bound as follows:
l Different types of cables must be separately routed and cannot be entangled.
l The cables must be bound tightly and neatly. The sheaths of the cables must not be damaged.
l The cable ties must face the same direction, and those at the same horizontal line must be
in a straight line. Extra length of cable ties must be cut.
l Labels or nameplates must be attached to the cables after they are installed.
The cables must be routed as follows:
l Different types of cables must be separately routed with a minimum space of 30 mm (1.18
in.) between every two cables.
l Different types of cables must be installed in an untangled and orderly fashion.
l Different types of cables must be routed in parallel or separated by special objects.
Special Cabling Requirements
Cabling requirements for power cables are as follows:
l -48 V power cables must be bound together.
DBS3900 (Ver.B)
Installation Guide
12 Indoor Scenario with DC Power Supply (BBU Installed in
a 19-Inch Rack)
Issue 06 (2011-09-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
412
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