H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/234, 344/28,
H04L 12/64 (2006.01) H04L 12/433 (2006.01)
Patent
CA 1273118
Abstract In a local area network in which the transmission line is in the form of a ring looped through various nodes which regenerate the signals on the line, the signals are organized into hybrid frames, each having a circuit zone for transmissions of signals having continuity requirements and a subsequent packet zone for packet communications, with each node having a right of access to the ring in turn both during the circuit zone and during the packet zone on a round-robin basis. In order to avoid packet transmissions in one frame overlapping a following frame, packet transmissions to the line, by whichever node has access or is just about to obtain access, are interrupted a predetermined period before the end of the frame, and resumed by the same node in the packet area of the following frame; thus the commencement of rounds of packet communications from the various nodes and the commencement of the packet zones of the frames are asynchronous. The predetermined period before the end of the frame and after the interruption is preferably equal to the time taken to propa- gate the signal round the ring, so that propagation of data already transmitted before the interruption can be completed ahead of the commencement of the following frame. Various imple- mentations are possible, in which a master node controlling frame timing may be either fixed or moved in each frame to the node interrupted in the previous frame, and various arrangements may be used for enabling nodes to recognize their right of access and to achieve correct timing of the interruption of packet transmissions relative to the end of the frames.
531115
Roffinella Daniele
Sposini Maurizio
Cselt - Centro Studi E. Laboratori Telecommunicazioni S.p.a.
Ridout & Maybee Llp
Roffinella Daniele
Sposini Maurizio
LandOfFree
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