Method of generating a clock signal for the upstream channel of a bidirectional point-to-multipoint network
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United States of America Patent
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Sep 28, 2004
Grant Date -
N/A
app pub date -
Jun 7, 2000
filing date -
Jun 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A master clock signal generated at the center (1) of a bidirectional point-to-multipoint network is transmitted in the form of time stamps in an MPEG-2 data format over the downstream channel of the network to a plurality of transmitting/receiving facilities (3). Each transmitting/receiving facility (3) derives the clock signal for the upstream channel from the master clock signal and a local clock signal generated by a reference clock (12). The center (1) compares the clock signal from each transmitting/receiving facility with the master clock signal and derives from the result of this comparison digital phase correction information individual to each transmitting/receiving facility (3), which it transmits to the respective transmitting/receiving facility (3) in the MPEG-2 data stream. The respective transmitting/receiving facility (3) uses the phase correction information to control the clock signal for the upstream channel in a numerically controlled oscillator (13).
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