Line in-use indicator for a telephone set and facsimile machine

Details Line in-use indicator for a telephone set and facsimile machine Line in-use indicator for a telephone set and facsimile machine

1994-02-22

1996-05-28

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379 96, 379111, 379133, 379377, H04M 1506, H04M 156

Patent

active

055219748

ABSTRACT:
A facsimile apparatus and a telephone set are connected to one telephone line in parallel with each other. A voltage variation .DELTA.V caused by closing and opening of a DC circuit of the telephone set is detected via an off-hook detector of the facsimile apparatus to establish the operation mode of the telephone set. The detected operation mode of the telephone set is stored in a RAM. The detected mode of the telephone set, and thus the closing and opening of the DC circuit of the telephone set, is displayed and/or printed.

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