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Installation manual

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17
Removing and Replacing Model 3921
Plus
Modems
CAUTION
If the Model 3921
Plus
is removed from the carrier, always use a
ground strap when handling the modem. Always store the
Model 3921
Plus
in an antistatic bag when it is removed from
the carrier.
It is not necessary to power down the carrier to remove and replace a Model 3921Plus modem. Perform the
following steps:
1. Rotate the circuit pack lock until the release tab is exposed.
2. Press down on the release tab and pull the modem away from the carrier’s backplane.
Menu Tree
The following page provides a graphic representation of the general menu structure of the front panel or SDCP
display. Use the Menu Tree for reference when performing the modem’s various functions.