Method of synchronization status message processing in transmission apparatus
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United States of America Patent
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-
Mar 21, 2000
Grant Date -
N/A
app pub date -
Feb 12, 1998
filing date -
Sep 1, 1997
priority date (Note) -
In Force
status (Latency Note)
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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.
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