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On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
The influence on the relevant components
II.
Before detaching the BTRM, first detach the BRFM to which it
corresponds -- see "4.2.8
about BRFM detachment. When the BTRM is installed, put the
corresponding BRFM back.
Handling optical fibers
III.
Before replacing the BTRM, disconnect the optical fiber cable
from the panel (make notes of the optical interface to which each
optical fiber corresponds). Connect the optical fiber cable back on
the new BTRM after the replacement is finished.
Be careful when plugging and unplugging the optical fiber. If the
fiber connector has a locker tab, remember to press it down when
unplugging the connector.
Installing BTRM
IV.
When installing the BTRM, make sure the module 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.
4.2.11 Receive LNA Distribution Unit (RLDU)
The physical structure of RLDU is rather different from that of
the boards in the baseband subrack, therefore, while basically
observing the "4.1.1
as the board removal & installation, are not applicable to RLDU and
BTS RF Fan Module (BRFM)" for details
Board Replacement" (some processes, such
4-15
Chapter 4 Component
Replacement
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Troubleshooting
