
B-3
AppendixB ModemUpgrade Instructions
NortelNetworks 5399 Access Switch HardwareInstallation Guide
Modem Card Installatio n InstructionsObserve handling precautions: electrostatic -sensitive devices.
Thefollowing instructions describe how to install the modem cards onto
the Remote Access Concentrator module( seeFigure B-2).
1. Find the locationson the module in which the modem cards
arein stalled.
2. On the modem cards, find the blank connector p osition
labeled JP1.
3. Orient the modem card so that JP1 isclosest to the rear
edge of the module and carefully press it into the card
connector,making sure not to bend or damage any pins.
Make sure that the connector is fully seated.
4. Push the cornersof the modem card down onto the nylon
standoffs untilthe locking detents engage.
5. Insert and tighten the two screws to secure the modem card.
6. Followthe installation instructions detailed in Chapter 2 to
reinstall the upgraded Remote Acces s Concentrator into the
System 5000 Hub.