Call for service and continuity sensor circuit

Details Call for service and continuity sensor circuit Call for service and continuity sensor circuit

H - Electricity

04

M

379/66

H04M 19/00 (2006.01) H04M 7/00 (2006.01)

Patent

CA 1128224

TITLE A CALL FOR SERVICE AND CONTINUITY SENSOR CIRCUIT ABSTRACT OF THE DISCLOSURE A call for service and continuity sensor circuit for use in conjunction with a trunk circuit of a digital PABX telephone system interfacing with a central office via ground start signalling providing for detection of a call for service signal to the PABX by the central office. This circuit also provides the means to effect an open circuit for both signalling and transmission conditions in order to prevent excess loading of the trunk circuit during these conditions. This circuit provides a precise and stable threshold detection level necessary for accurate sensing of the trunk circuit conditions mentioned above despite parasitic leakage current, induced longitudinal power line voltages, and earth potentials sometimes existing on the line connecting the PABX to the central office.

338524

Affiliated with

Also associated with

Rating

Call for service and continuity sensor circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Call for service and continuity sensor circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Call for service and continuity sensor circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-668005