User`s guide

Hardware Options
C-4 Modem 3600
Figure C-3 shows a typical jumper configuration.
Figure C-3. Typical Jumper Configuration
Ground Option Jumper
Signal ground is normally connected to chassis ground. If interference
exists, isolate signal ground from chassis ground.
*
factory setting
Replacing the Cover
To replace the cover, align the lock clips, rear guide grooves, and front
lock tabs. Press the cover in place until the lock clips engage the lock
prongs.