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VMMI Programming Exercises

Printed in the USA Page 1 GCA39-082 Rev 2, Issue 9/01

Signaling Types

You can program the communication system to respond to 3 different standard-protocol types of

E & M signaling: immediate signaling, wink signaling, and delayed signaling.

Immediate Signaling

The called system answers as soon as the calling system initiates the call. There is no

delay between calling and answering.

This signaling method is usually used if the line is programmed for hot line operation or is

programmed for pulse dialing.

Wink Signaling

The called system places a momentary signal reversal (wink) on its M lead to alert the

calling system that it is ready to receive information. The calling system controls the

status of the M lead and watches for a return signal from the called system on the E

lead. A wink occurs when the called system is ready to receive dialed digits from the

calling system. Dialing can begin only after the wink is complete.

After the wink occurs, the called system (if it is programmed for dialing) returns dial tone

to the calling system as an indication it is ready to receive digits. This signaling method is

the preferred protocol for use between two communication systems.

Delayed Signaling

The called system immediately responds to the calling system by sending an off-hook

signal on its M lead. It holds this off-hook condition until it is ready to receive digits and

then returns its M lead to on-hook. After the signal exchange occurs, the called system (if

it is programmed for dialing) returns dial tone to the calling system as an indication it is

ready to receive digits.

This signaling method is an alternate to wink start signaling that also provides equipment

readiness signals. This method is most useful if the Comdial system is connected to

another manufacturer’s PBX with incompatible wink timing parameters

In addition to the standard-protocol signaling, you can program the system to respond to two

types of non-standard tie line signaling protocols: hot line and intercom dialing.

Hot Line

You can program the system for hot-line operation so that as soon as a user accesses

the tie line, the station or stations at the distant system that have access to the personal

or group intercom assigned to the hot line will ring.

Intercom Dialing

Alternately, you can program the system for intercom dialing mode so that as soon as

users access the tie line they will hear dial tone. Upon hearing dial tone, they can dial

either a personal or group intercom number at the distant system.

E & M Tie Line Setup

E & M tie line programming can be broken down into 3 general steps:

1. Specifying the circuits used

2. Programming the tie lines

3. Setting up line access

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