Methode and system for upstream data packet time slot...

Details Methode and system for upstream data packet time slot... Methode and system for upstream data packet time slot...

H - Electricity

04

N

350/24

H04N 7/173 (2006.01) H04L 12/28 (2006.01)

Patent

CA 1209686

ABSTRACT OF THE DISCLOSURE Synchronization of upstream data packet time slots with the vertical blanking interval (VBI) of a video signal transmitted downstream from the headend is provided in a two-way cable television (CATV) system. Coded data transmitted during a designated VBI line from the CATV headend is compared with system data stored in each subscriber terminal for generating a match signal. The match signal is used to interrupt a microcomputer which then divides the next video signal raster scan field into 8 equal time slots during any one of which an upstream data packet may be transmitted. Upstream data is thus accurately synchronized with a downstream vertical scan rate signal in reducing the likelihood of collisions between upstream data packets and increasing through-put in a two-way CATV system.

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