Frame synchronization dependent type bit synchronization...

Details Frame synchronization dependent type bit synchronization... Frame synchronization dependent type bit synchronization...

H - Electricity

04

L

350/34

H04L 7/00 (2006.01) H04L 7/033 (2006.01) H04L 7/10 (2006.01)

Patent

CA 2037739

A frame synchronization dependent type bit synchronization extraction circuit in an integrated service digital network (ISDN) terminal equipment (TE) connected to a reference point S/T of an ISDN basic user network interface, for establishing bit synchronization between an internally produced signal and received data. To make the timing extraction jitter small and make the bit timing stable, it comprises a counter preset mode synchronization unit, a digital phase-lock loop mode synchronization unit, frame synchronization detection unit, and an inhibiting unit for inhibiting the operation of the counter preset mode synchronization unit, and the bit synchronization is effected by only the digital phase locked loop mode synchronization unit after the frame synchronization is detected by the frame synchronization detection unit.

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