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signals
∙LS (loop start) supervision — A supervisory signaling scheme used between a telephone and a PBX in which the telephone completes the loop current path. Some PBXs provide loop start trunk arrangements, but due to the difficulties with glare resolution, AT&T PBXs do not provide these trunks as standard offerings.
∙RB (reverse battery) supervision — A supervisory technique on
Signaling Protocols
Signaling protocols are conventions for alerting the far end of an incoming call. Signaling protocol is an administrative option for trunks on System 75, System 85, G1, and G2. On System 85 and G2, you specify the signaling protocol when you specify the signaling type with PROC 100. On System 75 and G1, you enter the signaling protocol as the trunk type at the Trunk Group screen.
Network trunks operate as automatic, immediate start, dial tone, wink start,
∙Automatic — The originating switch sends no digits or
∙Immediate start — The originating switch sends digits immediately after seizure
∙Dial tone — The terminating switch sends precise dial tone to the originating switch, indicating that the terminating switch is ready to receive digits. (Use with E & M or GS.)
∙Wink start — The terminating switch sends a wink start (momentary
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Trunk Type
Trunk type is an administration option on System 85 and G2 switches. You set the trunk type through PROC 100 Word 1.
On System 85/G2 switches, there are over 100 administrable trunk types (see appendix C). Each type is a numeric code that represents a designated combination of trunking application, and signaling types. Each combination is represented by a different code.
Listed on the tables that follow are some trunk types that may warrant further explanation. They are as follows: