H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04L 12/28 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2007634
1. The invention is related to a method of transmitting data packets in time slots on a communications network having first and second unidirectional buses which are oppositely directed and a plurality of access units coupled between the buses, said method including the steps of forming a distributed queue of data packets by queueing in each access unit the therein received data packets to be transmitted on the first unidirectional bus, transmitting a request flag on the second unidirectional bus by each access unit for each data packet in the queue in the respective access unit, keeping track in each access unit of all request flags passing said access unit on the second unidirectional bus, and transmitting a data packet from the queue in access unit if a predetermined number of empty time slots has passed said access unit on the first bus, to improve the flexibility and the adjustability in relation to the traffic density of transmitted data packets the method comprises the steps that at the time a further data packet, which was received in an access unit and was added to the queue therein, reaches a position in the queue in Which there is a predetermined number of data packets between said further data packet and the head of the queue, a request flag is transmitted on the second bus by said access unit and that said further data packet is transmitted by said access unit in the first empty time slot on the first bus after a number of free slots on the first bus have passed said access unit, said number of free slots being equal to the total number of data packets in the distributed queue for which already request flags were transmitted at the time said further data packet reaches said above mentioned position.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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