Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1991-10-02
1993-06-08
Schreyer, Stafford
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 21, 379 29, 379413, H04M 124
Patent
active
052186164
ABSTRACT:
Disclosed is a telephone line testing device comprising: clip leads for connecting the device to "ring," "tip" and external ground lines of the telephone line to be tested. Terminal pads make "ring" and "tip" connections to a craft telephone and a first testing circuit connectable to receive DC signals from the "ring" and the "tip" lines to provide electrical signals indicative of the magnitude of direct current available from the lines. Another testing circuit is connectable to receive AC signals from the "ring" and the "tip" lines to provide electrical signals indicative of the signal loss of the lines. A third testing circuit is connectable to receive AC signals selectably either from the "tip" and the "ring" connections or from the "tip" and the external ground connections comprising a filter and amplifier to receive and treat the AC signals and to apply the treated signals to the input of the second testing circuit. A line holding and power supply circuit is connectable to draw a line holding current from the "ring" and said "tip" lines through the clip leads and to produce regulated direct current to power the second and third testing circuits.
REFERENCES:
patent: 3508139 (1970-04-01), Rummel
patent: 3711661 (1973-01-01), Garrett et al.
patent: 4051333 (1977-09-01), Schomburg
patent: 4055733 (1977-10-01), Holsinger et al.
patent: 4544807 (1985-10-01), Sers
patent: 4552996 (1985-11-01), de Bergh
patent: 4564728 (1986-01-01), Romano
patent: 4600810 (1986-07-01), Feldman et al.
patent: 4720845 (1988-01-01), Lechner et al.
patent: 4751724 (1988-06-01), Amadio et al.
patent: 4825458 (1989-04-01), Dash
patent: 4827498 (1989-05-01), Ross
patent: 4841559 (1989-06-01), Curtis
patent: 4912755 (1990-03-01), Blood et al.
patent: 4969179 (1990-11-01), Kanare et al.
patent: 5025466 (1991-06-01), Hilligoss et al.
Communications Technology Corporation
Schreyer Stafford
LandOfFree
Telephone line tester does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Telephone line tester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone line tester will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1947722