Method of synchronization status message processing in transmiss

Details Method of synchronization status message processing in transmiss Method of synchronization status message processing in transmiss

1998-02-12

2000-03-21

Ngo, Ricky

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

H04J 306

Patent

active

060410663

ABSTRACT:
A transmission apparatus has units to which main signals are input for subjecting these main signals to predetermined processing and then transmitting them. One of these units is a master unit and the others are slave units and they are interconnected by a clock cable and processor-to-processor cable. Each slave unit detects a synchronization status message that has been inserted into a main signal input from a line and notifies the main unit of this synchronization status message via the processor-to-processor cable. Using synchronization status messages acquired from the slave units and a synchronization status message that has been inserted into a main signal input thereto, the main unit obtains the synchronization status message indicative of the best quality level and adopts, as a master clock, a clock extracted from the main signal into which this synchronization status message has been inserted.

REFERENCES:
patent: 4727539 (1988-02-01), Arita et al.
patent: 5241543 (1993-08-01), Amada et al.
patent: 5327402 (1994-07-01), Shinomiya
patent: 5333299 (1994-07-01), Koval et al.
patent: 5361260 (1994-11-01), Mito

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