Replacing The Transmission Unit - Nokia MetroSite Maintenance Manual

14.
15.
If the green LED is lit on the TRX after the replacement procedure, the BTS is in
service. If the LED is yellow or red, check the alarms and run the TRX test from
the BSC/NMS.
6.5

Replacing the transmission unit

This section provides instructions on how to replace a faulty transmission unit
with the same type of transmission unit.
Caution
If the transmission unit to be replaced is an FXC RRI type, the BTS power must
be switched to the stand-by position from the switch on the BTS power supply
unit before disconnecting the Flexbus cable!
Note
If the transmission unit to be replaced is an FXC E1 or FC E1/T1 type, the outer
conductor of the 75 Ohm RX connector can either be grounded capacitively or
directly. When the metal bridge connecting the TX and RX connector is removed,
the grounding becomes capacitive.
Replacing the transmission unit
1.
2.
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Either import the TS allocation file from your PC hard disk or manually
allocate the transmission capacity.
With Nokia BTS Manager, right-click the BCF object in the Equipment
View window and carry out a BCF Object Reset, or, if locked from the
BSC/NMS, request an unlock from the BSC/NMS (the BCF reset is
automatic in this case).
Connect your Nokia BTS Manager PC to the LMP connector on the
interface unit.
Verify the type of transmission unit.
If the transmission unit is an FXC E1 or FXC E1/T1 type, export the cross-
connection information to a file before replacing the unit. You can import
the cross-connection information from the file to the new unit. These
procedures are detailed later in this section.
Draft
Replacing units
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