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Installation Manual – Hardware Installation
BBU3806 WCDMA Base Band Unit
Lead feeders into the equipment room through a cabling rack or underground
burial.
Install grounding clips to feeders at the following points:
even if the tower is over 60 m high.
After leading a feeder into the equipment room, add a coaxial lightning arrester
with nominal discharge current no less than 5 kA to the feeder. The ground lead
of the grounding terminal of the lightning arrester must connect to the grounding
line, lightning protection band or ground grid outside the feeder inlet. The feeder
lightning arrester must match the communications equipment in terms of
impedance, attenuation, and working band.
Ground both ends of the cabling rack securely.
3.4.10 Signal Cable Lightning Protection Requirements
To ensure sound lighting protection for signal cables, you shall:
Lead underground signal cables rather than aerial signal cables to the NodeB
site.
Lead metal-sheathed signal cables into or out of the site or pull them through
metal pipes.
If underground signal cables cannot be led into the site, lead them through metal
tubes. Ground both ends of the tubes securely. Install a large through-current
capacity lightning arrester to the point where the cables are led into the site.
Make the ground cable of the lightning arrester as short as possible. Ground the
idle lines in the cable.
3.5 Equipment Room Requirements
The equipment room hosting BBU3806 must meet the following requirements:
Floor space
Height
Load bearing
Floor
Doors and windows
Roof and wall
Dust density
Quake prevention
Lighting and illumination
Less than 1m off the platform on the tower
Less than 1m from the outdoor cabling rack to the tower body
Outside the feeder window
One clip every 20 m on feeders along the tower. Use at most three clips
One clip every 20 m on feeders on rooftop
Huawei Technologies Proprietary
BBU3806 Operating Environment Requirements
3-5
Chapter 3
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