Apparatus for isolating the voice frequency path from the floati

Details Apparatus for isolating the voice frequency path from the floati Apparatus for isolating the voice frequency path from the floati

1982-12-13

1985-11-12

Brown, Thomas W.

179 18FA, H04M 700

Patent

active

045529949

ABSTRACT:
In a floating battery feed circuit, the voice frequency is normally connected on the subscriber loop side of the blocking capacitor which is used to prevent the DC loop current from flowing in the winding of the associated voice frequency transformer. This capacitor adversely offsets the dial pulse signals. An optical isolator is responsive to the answer control signal from a dial pulse originating (DPO) channel unit and provides a control signal to a switching circuit, which connects the voice frequency circuit to the loop during answer periods and disconnects the voice frequency circuit from the loop during dial pulse signaling.

REFERENCES:
patent: 4056691 (1977-11-01), Freimanis et al.
patent: 4122305 (1978-10-01), Fish et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4423292 (1983-12-01), Turek
"D4 Digital Channel Bank Family", W. G. Albert et al., The Bell System Technical Journal, vol. 61, No. 9, Nov. 1982, pp. 2757, 2783.
"Per-Channel Equipment," C. L. Maddox et al., The Bell System Technical Journal, vol. 51, No. 8, Oct. 1972, pp. 1659-1674.
"The D3 Channel Bank", W. B. Gaunt et al., Bell Labs Record, Aug. 1972, pp. 229-233.
"91253 Dial Pulse Originating Channel Unit," GTE Practices Engineering-Plant Series, Section 342-911-151, Issue 2, Jul. 1979, pp. 1-12.
"Digital Channel Bank Requirements and Objectives", Bell Systems Technical Reference, Nov. 1982, pp. 1-11.
"91403 DPO and 91405 DPT Channel Units," GTE Practices Engineering-Plant Series, Section 342-911-117, Issue 1, Jun. 1979, pp. 1-8.
"91403 DPO and 91405 DPT Channel Units", GTE Practices, Addendum 342-911-117, Issue 1, Aug. 1979, pp. 1-3.
"9004A PCM Channel Bank", GTE Practices Engineering-Plant Series, Section 342-911-111, Issue 2, Apr. 1980, pp. 1-70.
"91250 Stop Dial/Wink Originating Channel Unit", GTE Practices, Engineering-Plant Series, Section 342-911-148, Issue 2, Jul. 1979, pp. 1-6.
"91258 FXO and 91259 FXS Channel Units", GTE Practices, Engineering Plant Series, Section 342-911-155, Issue 3, Aug. 1979, pp. 1-18.

Affiliated with

Also associated with

Rating

Apparatus for isolating the voice frequency path from the floati does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for isolating the voice frequency path from the floati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for isolating the voice frequency path from the floati will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1881229