Pre-busy Signaling

This signaling type is used to visually indicate the availability of an intercom station at all intercom stations which have a direct dial key to this intercom station before placing the call. If no direct dial key is available, there is no indication.

A busy intercom station is indicated with continuous light at the LED.

See also:
Partly-busy Signaling
Priority Override Busy Signaling

INDUSTRONIC Glossary Download