Removal of an alerting signal in response to a loop closure. [T1.407-1997]

1. The improper routing of a call back through a switching center already engaged in attempting to complete the same call.
2. In secondary surveillance radar, the presence of false targets declared as a result of transponder interrogation by side lobes of the interrogating antenna.

1. In telephony, a signal, usually consisting of an audio tone interrupted at a slow rate, provided to a caller to indicate that the called-party instrument is receiving a ringing signal.
Note: This signal may be generated by the called-party servicing switch or by the calling-party switch.
2. A ringing signal returned to a caller to indicate that one of… (Read More →)

Synonym audible ringing tone.

In telephony, a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp and cause the drop of a self-locking relay.
Note 1: Ringdown (a) is used in manual operation, as distinguished from dialing, (b) uses a continuous or pulsed ac signal transmitted over the line, and (c) may be used… (Read More →)

In telephony, a circuit in which manually generated signaling power is used to perform ringdown.

In telephony, the application of a signal to a line (a) to operate a line signal lamp or a supervisory signal lamp at a switchboard or (b) to ring a called receiver instrument.

A number determined in accordance with the Code of Federal Regulations, Title 47, part 68, which number represents the ringer loading effect on a line.
Note: A ringer equivalency number of 1 represents the loading effect of a single traditional telephone set ringing circuit. Modern telephone instruments may have a REN lower than
1. The total REN expresses the total… (Read More →)

Oscillations that occur in the output of systems after a sudden change in the input. [T1.646-1995]

In traditional telephony, a nominal period (usually approximately 6 seconds) composed of alternate (a) ringing signals (ringing current) and (b) a silent interval.