matched pulse intercepting

matched pulse intercepting

[′macht ¦pəls ‚in·tər′sep·tiŋ]
(communications)
System for intercepting calls on party lines in a terminal-per-line office; operates on a ground pulse which is matched in time with the intercepted station's particular ringing frequency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.