Supervision Signaling on Analog Trunks

For the purposes of supervision signaling on analog trunks, this section covers operation over four-wire trunks. The transmission path is divided into two parts: a 300- to 3400 Hz voice-band and a 3825Hz narrow-band for signaling. In this method, filters separate the signaling tone from the voice path. This is considered out-of-band signaling, even though signaling is over the same facility.

CCITT-R2 uses the tone-on-idle signaling supervision method; National R2 uses pulse signaling.

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