4 Maintain the LIU Subrack
4.2 Replace LIU Board
The following figure shows the 120 Ohm and 75 Ohm LIU boards.
JBXLIU
Screw
Handle
Screw
Power/FailPower/Fail
JBLIU75
Screw
Handle
Screw
Power/Fail
Figure 23: LIU Board
In case of failure, a replacement must be organized as soon as possible to
minimize traffic interruption.
When the LIU board is replaced there is a traffic reduction for about 4
minutes.
When replacing a LIU board the replacement board must support the same
impedance as the replaced one.
Impact on System Note the following impact on the system:
In case of LIU board connected to Abis interface:
The telecommunications links for coresponding BTS connected to replaced
board are lost.
In case of LIU board connected to AterMux interface:
The telecomunication links are reduced.
3BK 21281 AAAA PCZZA Ed.13 63 / 90
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