Semiautomatic Switching System

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response response time responsivity restoration return loss rf power margin ringaround ringback signal ringdown ringer equivalency number ring latency	round trip delay time routing indicator rubidium standard rural radio service saturation scan schematic scrambler screen secondary frequency standard second dialtone	security security kernel security management self synchronizing code sensitive information sensitivity separate channel signaling serial access serial transmission service termination point shadow loss	shannon's law sheath shield shift register shot noise sideband signal compression signaling signal processing gain signal to crosstalk ratio signal to noise ratio