Black Box 3600 User Manual page 204

Hardware Options
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.
C-4 Modem 3600