activation of the sender by transients mimicking the KP signal.

Reliability of the signal increased with slower timing, like most signals. The timing was therefore variable from these minimae, with later authors suggesting a 100 millisecond KP.

Demise

In-band signaling fell into disfavor in the public switched telephone network (PSTN) as electronic switching systems displaced electro-mechanical switching systems, but legacy offices may still exist in some countries

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