Common control signaling extraction circuit

Details Common control signaling extraction circuit Common control signaling extraction circuit

H - Electricity

04

Q

344/13, 363/14,

H04Q 11/04 (2006.01) H04J 3/06 (2006.01) H04J 3/12 (2006.01)

Patent

CA 1060975

COMMON CONTROL SIGNALING EXTRACTION CIRCUIT Abstract of the Disclosure A signaling extraction circuit utilizes common control circuitry to carry out the signal extraction function for all of a plurality of time multiplexed, digital data groups (digroups), each of which comprises 24 time division multiplexed, PCM encoded channels. Each digroup uses eight bits for transmitting digital informa- tion for each channel, but the eighth bit (D8) is borrowed for signaling purposes in every sixth frame,. To identify these signaling digits, signaling framing information is inserted in a digroup bit stream in the framing bit position of every other frame (i.e., the subframes). A signaling subframe pattern store comprising a shared recirculating memory serves to maintain a continuing real time record of the pattern of the signaling framing information for each digroup, as well as a test digroup. When a predetermined pattern has been recorded for a digroup (i.e., a zero subframe bit preceded by a string of exactly three ones, or a one subframe bit preceded by a string of exactly three zeros) a signal bit store is enabled to receive the D8 bits of the signaling frame which follows the recording of said predetermined pattern.

261507

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