Constellation™ November 2003
11-26 Field-Replaceable Units
High Level Mux
Figure 11-18:High Level Mux, front view
Removing the High Level Mux (HLM)
• In a MHSB configuration, start with
step 1
.
• In a nonprotected configuration, start with
step 2
.
In a nonprotected configuration, removing the
HLM is a service-affecting procedure.
1. Use the Keypad command to lock traffic on to the HLM that is not being
removed. This step causes a minor alarm.
CONTROL > LOCK/IF LPBK > LOCK HLM, SET
2. Use the 2 extractor tabs to unlock the HLM from the shelf.
3. Carefully pull out the HLM from the shelf.
Extractor (2)
FAULT (red LED)
ON-LINE (green LED)
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