AT&T Door Phone Controller - Manual (Page 67)

Overview
This section provides installation and operation information for
installations which use a telephone system that does not have
Ground start trunks will NOT
an available Dedicated Trunk or Station Port. By configuring
operate properly with this
the telephone system to the instructions in this section, your
shared trunk installation. telephone system equipment will operate in Trunk/Port share
mode.
DIP Switch Selections
Complete information about the To customize the AT&T Door Phone Controller to your specific
DIP switch settings can be installation and option requirements, you must properly set the
found in Appendix A.
8-position DIP switch located on the AT&T Door Phone
Controller front panel (see Figure 1-1). Use the flow chart in
Figure 6-1 to help configure the DIP switch for either Trunk
Saver or Port Saver Mode.
A trunk shared with the AT&T Door Phone should never be
configured in a telephone system with other trunks in a
common pool or group.
6-2 Installation - No Dedicated Trunk/Station Port