Huawei Airbridge cBTS3612 Maintenance Manual page 82

On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
The physical structure of CDU is rather different from that of the
boards in the baseband subrack, therefore, while basically observing
the "4.1.1 Board Replacement" (some processes, such as the
board removal & installation, are not applicable to CDU and thus,
can be handled flexibly), we should also pay attention to the
following:
The influence on the service
I.
Replacing a CDU may affect the services transmitted through it.
Remember to switch off the BTRMs that transmit signal via this CDU
from the BTS switch box before replacing it.
Handling relevant cables
II.
Before replacing the CDU, disconnect the RF cable on its panel
(remember to make notes of the matching relation of the main &
diversity cables and the corresponding ports). When the replacement
is finished, connect the cables back to the panel of the new CDU (in
the same way as that of the replaced unit) and make sure the
connectors are fixed tightly and in good contact. Do not damage the
connectors and be careful to run the cables wisely.
Detaching and installing the CDU
III.
The CDU is rather heavy. Please hold it by the bottom with one
hand when handling it.
When installing the CDU, make sure its panel is in a seamless
contact with the front edge of the subrack and then tighten the
screws, or the RF transmission may not be able to meet the index.
4-17
Chapter 4 Component
Replacement