Multiplex communications – Wide area network – Packet switching
Patent
1990-01-09
1991-08-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 370 856, 370 859, 3408255, H04J 324
Patent
active
050383477
ABSTRACT:
A method and system for 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 there-between. To form a distributed queue of all data packets, which are to be transmitted on the first bus, each access unit establishes a queue of the data packets therein, transmits a request flag on the second bus for each data packet in the queue in such access unit, keeps count of the number of request flags passing such access unit on the second bus, and transmits the data packet at the head of its queue after a predetermined number of empty time slots has passed such access unit on the first bus. To achieve improved flexibility and adjustability in relation to the traffic density of the data packets at different access units, at the time a further data packet which has been added to the queue in an access unit reaches a selected position in such queue, which position is a predetermined number of packets before the head of the queue, a request flag is transmitted on the second bus by such access unit. The further data packet is subsequently transmitted in the first empty time slot on the first bus following passage past such access unit of a predetermined number of empty time slots on such bus, the predetermined number of empty slots being equal to the total number of data packets in the entire distributed queue for which request flags had already been transmitted when the aforesaid further data packet reaches the selected position in the queue.
REFERENCES:
patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4313196 (1982-01-01), Oblonsky
patent: 4510599 (1985-04-01), Ulug
patent: 4730307 (1988-03-01), Hughes et al.
IEEE Proposed Standard: DQDB Metropolitan Area Network, Aug. 7, 1989, pp. 23-35.
Hsu Alpus H.
Olms Douglas W.
Slobod Jack D.
U.S. Philips Corp.
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