In any digital transmission, momentary glitches can appear on the line. Such errors or defects are detected and if they persist long enough (the “integration time†or 2.5 seconds per T1.231), an alarm condition is declared and the line brought down.
Since the line must weather defects lasting less than the integration time, in telephony robbed-bit signaling (RBS) or channel associated signaling (CSA) applications, an established call must also be maintained during the glitches. “Bit freezing†freezes the last known good signaling bits and thus keeps the connection up unless and until the defect lasts the integration time and the line taken down.
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