.~ Using line or loop condition detection (e.g., line circuit) {7}
382
.~.~ For ring trip or polarity reversal detection
DEFINITION
Classification: 379/382
For ring trip or polarity reversal detection:
(under subclass 377) Subject matter including detection of a change in the polarity of the potential difference across the line or loop, or of an off-hook condition of the called terminal to cause cessation of the alerting signal.
(1) Note. Off-hook detection often accomplished by distinguishing a voice signal from an A.C. ringing signal.
