Constellation™ November 2003
11-28 Field-Replaceable Units
High Level 155 Mux (HLM-155)
Figure 11-19:HLM-155, front view
Removing the HLM-155
• In a MHSB configuration, start with step 1.
• In a nonprotected configuration, start with step 2.
In a nonprotected configuration, removing the
HLM-155 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. Carefully disconnect the cables from the HLM-155.
3. Use the 2 extractor tabs to unlock the HLM from the shelf.
4. Carefully pull out the HLM from the shelf.
Extractor (2)
FAULT (red LED)
ON-LINE (green LED)
OUT (SMB connector)
Extractor (2)
FAULT (red LED)
ON-LINE (green LED)
TX (fiber optic transceiver)
ELECTRICAL
OPTICAL
IN (SMB connector)
RX (fiber optic transceiver)
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