Scrambling in digital communications network

Details Scrambling in digital communications network Scrambling in digital communications network

H - Electricity

04

K

363/10, 340/70

H04K 1/04 (2006.01) H04B 10/155 (2006.01) H04B 10/207 (2006.01) H04J 3/06 (2006.01) H04J 14/08 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1328130

ABSTRACT OF THE DISCLOSURE A passive, all optical communications network is provided in which a single optical source in a central station serves many outstations (eg telephones in customers' premises). Time division multiplexed optical signals from a laser source are transmitted along a single optical fibre from a central station. The signal is split between several secondary fibres at a first splitter (eg array of passive couplers) and between further sets of fibres at a second set of splitters. At this stage there are 120 individual fibres to customers' premises. Digital speech or data is sent back to the central station by a laser in the customers' premises operating in a low duty- cycle mode. The 120 data streams are interleaved at the branching points.

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