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l
Lay the incoming low voltage power cables underground at a depth of more than 15
meters.
l
Lay signal cables in the middle of the building. For vertical wiring, try to keep the
cable at least 5 m away from the poles of the building (especially the poles at the four
corners).
l
Protect the unshielded cables with metal tubes. Keep the cables in the equipment
room away from the lightning protection pole.
l
Install the lightning protection SPD near the cable inlet of the equipment room.
Connect the grounding cable of the lightning protection SPD separately from the
grounding bar.
l
Lay -48 V power cable, -48 V grounding cable, and protection grounding cable in
parallel in the equipment room. Lay them with the signal cables (including user cables)
in vertical direction.
l
If the room for the access equipment is adjacent to the room for the mobile equipment,
arrange the grounding cables in the access equipment room separately from the
grounding cables of the mobile tower.
l
Do not lay the AC power cable of the remote unit and remote modules in parallel near
the signal cables (including user cables) and -48 V power cables.
SJ-20110909101511-005|2011-12-31 (R1.1)
Appendix B Grounding Network Requirements
B-3
ZTE Proprietary and Confidential
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