Packet switch network protocol

Details Packet switch network protocol Packet switch network protocol

1987-01-12

1989-08-29

Atkinson, Charles E.

Excavating

G08C 2502

Patent

active

048624616

ABSTRACT:
A first of a plurality of nodes in a multiprocessor system transmits a data packet to a second of the plurality of nodes over a data channel when the first node detects a predetermined sequence of bits on a control channel connected therebetween. The data packet is preceded on the data channel by a header which includes a plurality of fields informing the second node of the beginning of the data packet, the length of the data packet and the sequence number assigned to the packet. The data packet is followed by a field which enables the second node to determine whether the data packet was received correctly. If the second node determines that the data packet was received correctly, the data packet is stored in the node and an acknowledgment sequence is transmitted to the first node over the control channel. However, if an error occurs during the transmission of the data packet, the protocol enters an error state by removing all signal information from the data and control channels. Thereafter, a recovery processor, which is associated with each of the plurality of nodes, analyzes the state of the nodes at the time of the error in order to determine which corrective action needed to recover the respective node. The data link protocol also facilitates the transmission of a data packet from a first node through an intermediate node to a final node without storing the data packet in the intermediate node.

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patent: 4586086 (1986-04-01), Ohzeki
patent: 4745593 (1988-05-01), Stewart

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