
B-5
AppendixB ModemUpgrade Instructions
NortelNetworks 5399 Access Switch HardwareInstallation Guide
Removing Modem CardsOccasionally itm aybe necessary to remove modem cards from the
RemoteAccess Concentrator module (for example, if a modemc ardfails
and needs to ber eplaced).On the R emoteAc cessConcentrator module,
there aretwo locations that can accommodate modem cards (up to 62
modems total) .
The followinginstructions detail how to remove a modem card from the
Remote Access Concentrator.Figure B-3 illustrates the instructions.
1. Locate the modem card that you want to remove.
2. Remove the two screws that secure the modem card to the
module.
3. Pushin the locking detent on the nylon standoff that secures
a cornerof the modem card to the module,and gently work
that cornerof the card off the nylon standoff (see
Figure B-3).
4. Repeat the procedure for the other corner of the modem
card that is secured by a nylon standoff.
5. Liftthe modem card straight out of its connector,making
sure not tod amagean y pins.