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Appendix A—DIP Switch Settings
Setting
the
DIP
Switch
Positions
The AT&T Door Phone Controller’s basic operating modes are
selected on the 8-position DIP switch at the front of the unit
(see Figure 1-1). Positions 1 through 5 are used to set up the
way the AT&T Door Phone Controller will interface with your
NOTE: All switches are OFF telephone equipment. Position 8 is used to access Option
when shipped from the
Selection Mode. Positions 6 & 7 are not used. The definition of
factory.
each switch position is given below:
Switch 1
Selects between Trunk Access and Station Access. Trunk
Access = OFF; Station Access = ON.
Switch 2
Selects between Dedicated Trunk or Shared Trunk. This switch
only has meaning when Trunk Access is selected with
Switch 1. Shared Trunk = OFF; Dedicated Trunk = ON.
Switch 3
Selects between Trunk Saver or Port Saver. This switch only
has meaning when Trunk Access is selected with Switch 1 and
Shared Trunk is selected with Switch 2. Trunk Saver= OFF;
Port Saver = ON.
Switch 4
Selects between Loop Start and Ground Start. This switch only
has meaning when Trunk Access is selected with Switch 1.
Loop Start = OFF; Ground Start = ON.
Switch 5
Selects between Auxiliary Alert or Ringdown. This switch only
has meaning when Station Access is selected with Switch 1.
Auxiliary Alert = OFF; Ringdown = ON.
DIP Switch Settings A-1