Extension-in-use exclusion apparatus

Details Extension-in-use exclusion apparatus Extension-in-use exclusion apparatus

1994-06-20

2000-05-09

Wolinsky, Scott

Telephonic communications

Multi-line or key substation system with selective switching...

With exclusion or priority feature

379194, 379199, 379442, H04M 172

Patent

active

060614382

ABSTRACT:
An extension-in-use exclusion apparatus is for use in a telephone system. The system has a telephone device, a telephone line, and two telephone extensions connected to the line. The apparatus is connected between one extension and the telephone device. The apparatus has an exclusion controller connecting the line to the telephone device when all extensions other than the extension for the telephone device are on-hook and the telephone device extension is off-hook. The exclusion controller does not connect the line to the telephone device when another extension is off-hook and the telephone device is off-hook. A user operable switch can instruct the exclusion controller to connect the line to the telephone device when another extension is off-hook and the telephone device is off-hook. The apparatus automatically returns to exclusion mode when the telephone device returns to off-hook. A by-pass allows FSK signals to pass directly through to the telephone device. The apparatus has no polarity and is symmetrical.

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