Multiplex communications – Wide area network – Packet switching
Patent
1994-05-12
1995-04-04
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 852, 370 853, 370 8513, 370 941, H04L 1256
Patent
active
054043530
ABSTRACT:
A technique for controlling access to a bridge connected to at least two networks, such that network collisions are reduced, transmit live-lock conditions are eliminated, and buffer memory requirements are minimized. For at least one target network of the two networks, two dynamic lists are maintained, to keep track of data packets received from the target network and not yet forwarded, and to keep track of data packets stored for forwarding to the target network, but not yet forwarded. The target network uses a half-duplex medium and a CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol. The invention operates by dynamically adjusting an inter packet gap (IPG) betweens data packets forwarded to the target network, such that stations on the target network are, under selected conditions, given an extended opportunity to transmit. The invention may also be used in conjunction with other techniques for reducing traffic congestion, such as adjusting network protocol parameters used in the target network, to either guarantee or deny priority to the target network in the event of a collision, based on the continually observed status of the two lists.
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Ben-Michael Siman-Tov
Lozowick Philip P.
Yang Henry S.
Blum Russell W.
Digital Equipment Corp.
Heal Noel F.
Johnston A. Sidney
Olms Douglas W.
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