Two-way cable-television system

Details Two-way cable-television system Two-way cable-television system

H - Electricity

04

N

350/24

H04N 7/173 (2006.01)

Patent

CA 1218144

ABSTRACT OF THE DISCLOSURE A tree-type two-way data communications system for use in a cable television system having a single head-end subsystem, data sources and a cable television distribution network. Each data source is a source of digital commands to the head-end subsystem. The two-way system has a number of interface subsystems intermediate of the head-end subsystem and each one of the data sources. The interface subsystems are coupled in a tree structure to the head-end subsystem and each one of the data sources is coupled to one of the interface subsystems. Each one of the interface subsystems is coupled to at least one other of the interface subsystems. The interface sub- systems receive without acknowledgment through the cable distribution network from at least one of the data sources the digital command signals. Each interface subsystem verifies data format and regenerates and forwards at least some of the digital commands as command packet signals in a packet signal format on an unlinked carrier towards the head-end subsystem. The head-end subsystems receive the digital command signals as command packet signals and develop response signals. The cable-distribution sub- system couples response signals in a tree-structure without loops from the head-end subsystems to each one of the data sources through a common signal path. That path is independent of the unlink for acknowledging receipt of the command packet signals.

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