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:
l
E1 cables must not cross power cables, PGND cables, or RF cables when routed. If
transmission cables are routed with power cables, PGND cables, or RF cables in parallel,
the spacing between them must be greater than 30 mm (1.18 in.).
l
E1 cables are routed straightly and bound neatly with cable ties.
l
Sufficient slack is provided in E1 cables at turns.
Cabling requirements for fiber optic cables are as follows:
l
Do not stretch, step on, or place heavy objects on fiber optic cables. Keep the cables away
from sharp objects.
l
When fiber optic cables are routed, the extra length of the cables must be coiled around
special devices, such as a fiber coiler.
l
When coiling fiber optic cables, apply even strength. Do not bend the cables with force.
l
Vacant optical connectors must be covered with dustproof caps.
7.2 Cable Connections
This section describes the cable connections for a single RRU and multiple RRUs.
NOTE
A lower-level RRU obtains power directly from the external power system, but not from an upper-level
RRU using a power cable.
shows the cable connections for a single RRU when the alarm monitoring function
is performed.
RRU3232
Installation Guide
7 Installing RRU Cables
Issue 05 (2011-10-20)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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