ZXC10 BTSB (V1.0) cdma2000 Base Transceiver Station Installation Manual
13-8
4. If a tower is above 60 m and needs a longer feeder, another feeder grounding
clip should be placed in the middle of the tower.
5. If a feeder is off the tower and routed for above 20 m at the building top or on
the cable rack before going into the room, another grounding clip for lightning
protection should be put at the building top or on the cable rack.
6. The terminals of the grounding clip of a feeder should be fixed on the steel plate
of a nearby tower.
7. The outdoor grounding copper bar employs a special reliable path to an
underground ground grid. The line width should be more than 50 mm2.
Otherwise, users should lay connecting cables as soon as possible.
8. For a building without a tower, the antenna feeder ground at the top should be
connected with the nearby lightning protection ground grid on the roof.
9. If the feeder employs a downward cable ladder to go along walls downward
from the building top and enters a room, the cable ladder should be grounded.
10. The grounding cable of a feeder should be led from up to down. The separation
angle between the feeder and grounding cable should be no more than 15º.
11. The cabling of the feeders should be visually appealing without crisscrossing.
They should be well arranged and have no apparent twists and turns. The feeders
entering a room should be tidy, flat, straight and with identical bending angle.
The main feeders are correctly connected and the sectors concerned are correct
too.
12. The minimum bending radius of a feeder should be no more than 20 times the
feeder radius, and the bending radius of the main feeder should be more than 0.3
m.
13. The cabling of the main feeders should be planned. When the cabinet front is
parallel to the direction in which a feeder enters a room or the cabinet back is
facing the direction in which a feeder enters a room, the main feeders within a
sector should be arranged as a row. The arrangement order of each row should
be consistent. When the cabinet front faces the direction in which a feeder enters
a room, one sector is arranged as a column and the arrangement order of each
column should be consistent.
14. The feeder connector should have no bare copper sheet. Two name labels should
Summary of Contents for ZXC10 BTSB I1
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Page 22: ... ii Table C 2 1 BTSB Board Indicators C 2 ...
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Page 91: ...Chapter 7 Cable Installation in Cabinet 7 15 Fig 7 3 5 RF Cable Interface in RFS ...
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Page 157: ...Chapter 12 Board Installation 12 11 Fig 12 5 1 Positions of Boards ...
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