Service Termination Point

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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 semiautomatic switching system sensitive information	sensitivity separate channel signaling serial access serial transmission 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 signal transition significant condition silicon photodiode simple network management protocol simplex circuit simplex signaling