4 Maintain the LIU Subrack
4.1 Before You Start
Impact on System
As long as only one JBXPEM or JBXMUX is removed and replaced at any
one time, there is no impact on the system. This is because the RITs work
in hot-standby mode. If a RIT fails, the standby RIT takes over the tasks of
faulty one. In case of failure, a replacement must be organized as soon as
possible to prevent traffic interruption.
When the LIU board is replaced there is a traffic outage. In case of failure,
a replacement must be organized as soon as possible to minimize traffic
interruption.
The LIU subrack is equipped with:
Line Interface Unit boards (JBXLIU)
Power Entry Modules (JBXPEM)
Multiplexing boards (JBXMUX).
The following figure shows the front view of the LIU subrack.
−48 / 60
VDC
4A
−48 / 60
VDC
4A
XPEM
XLIU
XMUX
XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU XLIU
XPEM
XMUX
Figure 22: Front View of the LIU Subrack
62 / 90 3BK 21281 AAAA PCZZA Ed.13
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