H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/205, 340/73
H04L 7/00 (2006.01) H04J 3/06 (2006.01) H04L 7/04 (2006.01) H04L 7/08 (2006.01)
Patent
CA 1226636
Abstract of the Disclosure Circuit Arrangement for Frame and Phase Synchronization of a Local Sampling Clock With such a circuit arrangement, the sampling clock is synchronized to the frame position and the phase of the characters of a received character stream containing a "unique word" at regular intervals. In a digital correlator (1), a cross- correlation function is generated from a unique word stored therein and from the received, sampled character stream, and a frame detection circuit (2) derives a frame clock (RT1) from those maxima of the crosscorrelation function recurring at intervals of one frame period. To achieve synchronization at any polarity of the received character stream (i.e., even if the tip and ring wires of the subscriber line are interchanged), a second frame detection circuit (3) derives a second frame clock (RT2) from those minima of the crosscorrelation function recurring at intervals of one frame period. A clock selection circuit (8) determines which of the two frame clocks is received within a limited time interval. From this frame clock, control information for representing the phase of the sampling clock (AT) is derived in a phase synchronization circuit (10). (Fig.2)
462742
International Standard Electric Corporation
Smart & Biggar
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