Method of generating a clock signal for the upstream channel...

Details Method of generating a clock signal for the upstream channel... Method of generating a clock signal for the upstream channel...

G - Physics

06

F

G06F 1/04 (2006.01) H04J 3/06 (2006.01) H04N 7/173 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2311071

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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