Framing type used on T1 circuits that consists of 24 f rames of 192 bits each, with the 193rd bit providing timing and other functions. ESF is an enhanced version of SF.
ESF is preferred to its predecessor, superframe (SF), because it includes a cyclic redundancy check (CRC) and 4000 bit/s channel capacity for a data link channel (used to pass out-of-band data between equipment.) It requires less frequent synchronization than the earlier superframe format, and provides on-line, real-time monitoring of circuit capability and operating condition.
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