Communication terminal device

Details Communication terminal device Communication terminal device

1996-03-07

1998-09-15

Bost, Dwayne D.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379373, 379161, 379184, H04M 100

Patent

active

058091327

ABSTRACT:
A communication terminal device having a line voltage detection circuit 6 connected in parallel with telephone lines 2 is characterized that when either of a built in telephone set 4 or an auxiliary telephone set 5 is off-hooked and then the hook detection circuit OH1/OH2 of the that telephone set 4/5 becomes on-hooked, the true on-off-hook states of that telephone set 4/5 and the branch telephone set 3 are judged by referring to the hook detection circuit OH1/OH2 and the aforementioned line voltage detection circuit 6 after a predetermined time period T has elapsed.
The communication terminal device such as a facsimile device and the like having the arrangement described above is able to detect the off-hook/on-hook state of a built in/auxiliary telephone set connected to the telephone lines in parallel with a branch telephone set without mistake even if the branch telephone set is off-hooked.

REFERENCES:
patent: 4551582 (1985-11-01), Matsuo
patent: 4691338 (1987-09-01), Makino
patent: 5317629 (1994-05-01), Watanabe
patent: 5369689 (1994-11-01), Kawamura
patent: 5392334 (1995-02-01), O'Mahony
patent: 5414764 (1995-05-01), Watanabe et al.
patent: 5428675 (1995-06-01), Terajima
patent: 5544241 (1996-08-01), Dibner et al.

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