Circuit for detecting loss of telephone line voltage

Details Circuit for detecting loss of telephone line voltage Circuit for detecting loss of telephone line voltage

1974-09-11

1976-05-25

Olms, Douglas W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340248B, 324133, H04B 346

Patent

active

039596052

ABSTRACT:
The present invention deals with a new and useful circuit for monitoring the condition of a telephone line used for ordinary telephony. The circuit detects malfunctions such as severance and shorting which result in the termination of line potential. The invention does not require a floating (ungrounded) DC power supply and the output is referenced to earth-ground.

REFERENCES:
patent: 3437928 (1969-04-01), Baker et al.
patent: 3573780 (1971-04-01), Butterbaugh
patent: 3729597 (1973-04-01), Garrett et al.

Affiliated with

Also associated with

Rating

Circuit for detecting loss of telephone line voltage does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for detecting loss of telephone line voltage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for detecting loss of telephone line voltage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-907517