CIRCUITRY FOR RECOVERY OF DATA FROM CERTAIN BIT POSITIONS OF A T1 SPAN

摘要

CIRCUITRY FOR RECOVERY OF DATA FROM CERTAIN BIT POSITIONS OF A Tl SPAN This circuit provides for retrieving common control interoffice signaling (CCIS) data from a PCM voice data stream of a Tl span. Tl spans interconnect switching offices. Unused data bits in these Tl spans are encoded with CCIS data and transmitted between the switching systems where the CCIS data is recovered.