ringdown

(redirected from Automatic ringdown circuit)

ringdown

[′riŋ‚dau̇n]
(communications)
In telephone switching, that method of signaling an operator in which telephone ringing current is sent over the line to operate a drop or a self-locking relay and lamp.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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