Transmitting data processing system

Details Transmitting data processing system Transmitting data processing system

H - Electricity

04

L

340/100

H04L 25/20 (2006.01) H04L 7/10 (2006.01) H04L 12/42 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1244110

ABSTRACT There is described a transmitting data processing sys- tem used in a node of a data transmitting system, like a local area network, which uses a relatively long ranged transmission line and a large number of nodes on the transmission line for relaying a frame comprising a preamble pattern and transmitting data. A beginning part of the preamble pattern is dissipated in the node when a clock signal is extracted from the preamble pattern. The dissipated part is restored in the node by adding a newly generated preamble signal having a time duration sub- stantially equal to the time duration of the dissipated part at the head of the dissipated preamble pattern after sensing the dissipated preamble pattern. Alternatively, the dissipated preamble pattern is replaced with a newly generated preamble pattern which is equal to a standard preamble pattern after sensing a carrier of the frame. The invention permits trans- mission through a large number of nodes without the necessity of a long preamble pattern.

498569

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