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.
l +24 V power cables must be bound together.
l Power cables, transmission cables, and signal cables are routed separately.
l Multiple power cables must be bound when routed.
l Power cables must be installed in the position specified in engineering design documents.
l If the length of power cables is insufficient, replace the cables rather than adding connectors
or soldering joints to lengthen the cables.
Cabling requirements for PGND cables are as follows:
l PGND cables for the base station must be connected to the same ground bar.
l PGND cables must be buried in the ground or routed indoors. They should not be routed
overhead before they are led into the equipment room.
l The exterior of the coaxial wire and the shield layer of the shielded cable must have proper
electrical contact with the metal surface of the equipment to which they are connected.
l PGND cables and signal cables must be installed in an untangled and orderly fashion. A
certain distance must be reserved between them to prevent interference from each other.
l Fuses or switches must not be installed on the PGND cables.
l Other devices must not be used for electrical connections of the PGND cables.
l All the metal parts in the housing of the equipment must be reliably connected to the ground
terminal.
Cabling requirements for E1 cables are as follows:
DBS3900 (Ver.B)
Installation Guide
7 Outdoor Scenario with DC Power Supply (BBU Installed
in a TMC11H)
Issue 06 (2011-09-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
189
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