Network architecture suitable for multicasting and resource lock

Details Network architecture suitable for multicasting and resource lock Network architecture suitable for multicasting and resource lock

1992-03-18

1993-09-07

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 60, H04L 1256

Patent

active

052435962

ABSTRACT:
A data communications network in which multiple host processors are linked in a ring network by respective network interface processors or nodes includes circuitry in each of the nodes which aids in the implementation of a distributed resource locking scheme and a reliable multicasting system. The circuitry includes a packet generator which automatically generates specialized packets that are used to procure resource locks and to implement the multicast system. In addition, the node includes circuitry which may be used to modify the contents of a received packet and circuitry which automatically retransmits the packet onto the network. The node is controlled by a set of state machines which implement the resource locking and multicasting protocols. In addition, the nodes include circuitry which detects congestion in the node and in the network and acts automatically to relieve the congestion. This circuitry notifies other nodes when a receive queue in the node is almost full so that the other nodes can suspend communications with the node. Other circuitry detects when the node is unable to transmit a message to cause the node to allocate an owned packet which may be used only by the node to transmit data.

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