AT&T Door Phone Controller - Manual (Page 49)

Overview
This section provides installation and operation information for
installations with a telephone system that has an available
Dedicated Trunk port.
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 4-1).
CAUTION: Do not connect to the modular jacks on the
AT&T Door Phone Controller until after the DIP switches
have been properly set.
Use the Flow Chart in Figure When using the AT&T Door Phone Controller with a telephone
4-1 to properly set the DIP system which has an available dedicated trunk, set the DIP
switch.
switch as shown in Figure 4-1. Prior to setting this DIP switch,
you must know if the dedicated trunk is Loop Start or Ground
Start; this information can be obtained from your local
telephone company.
4-2 Installation - Dedicated Trunk Port