Specifications

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ELMo 120 Multiplexer installation and testin
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Revision 2.01 ELMo 120 Multiplexer Installation and Maintenance Guide 08-01023-01
Task:
Connecting power to the ELMo 120 Multiplexer
modem shelf
Use this procedure to install the power feeds from a -48 V dc power source to
the ELMo 120 Multiplexer modem shelf.
Note:
The voiceband filter shelf does not require a power feed.
Requirements
This procedure requires the following:
• volt-ohm meter
• ELMo 120 Multiplexer power harness
• -48 V dc power fuse bay or dc rectifier
Power supply and wiring specifications are described in Appendix A.
Action
Step Action
1
Eject all cards (Power, Switch, and Modems) from the backplane of the shelf.
Ensure that the cards completely dislod
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e from their backplane connectors.
2
Route and connect a
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round wire from the buildin
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’s
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roundin
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facility to the
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round stud on the shelf side-flan
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e. See Appendix A, “Groundin
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environment specifications” on pa
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e A-3 for ELMo 120 Multiplexer
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roundin
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requirements.
—continued—
!
CAUTION
Serious equipment damage
Never connect untested power to the ELMo 120 with any circuit
packs installed. If the power feed polarities happen to be
reversed, the ELMo 120 shelf and rectifier could be seriously
dama
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ed.