User guide

Routine maintenance
119
Maintenance
Routine
Upgrading the system
Installing option modules
1. Power down the controller and disconnect all connec-
tions to the public telecommunications network.
2. Attach an anti-static strap.
3. Remove the top cover.
4. Locate the option module slots (see Figure 5). Note
that BRI modules (UK only) can be installed in option
module slots 1 and 2.
5. Remove the four screws from the standoffs. The
locations of the screws are shown in Figure 15.
Figure 15: Removing the screws
3100 Hand.bk Page 119 Monday, August 19, 2002 8:49 PM