ringdown

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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.
References in periodicals archive ?
These can include burglar alarm circuits, telemetry circuits that are used for remote meter reading or control signals, private lines that are used as an automatic ringdown circuit, like a hotline, radio tie lines, off- premise extensions that connect to an answering service and data circuits.
This new offering enables our traders to interact with our clients, accessing all critical turret functionality, including automatic ringdown circuits as if they were at their desks.

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