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Data Channel with Recovery for Errors in Messages Sent to an Associated Processor

IP.com Disclosure Number: IPCOM000040900D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Walters, RT: AUTHOR

Abstract

When a channel sends a message to an associated processor, it puts a sequence number in one field of the message and sets a bit in another field to signal that the message is not a duplicate. The channel makes conventional checks for data transmission errors. If an error is detected, the channel resends the message with the same sequence number and with the bit set to identify a duplicate message. From the standpoint of the associated processor, the duplicate message bit means that a subsequent message with the same sequence number is invalid. The associated processor tests the duplicate bit in each message, and if the duplicate message bit is set it discards the message with the duplicate bit set.

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Data Channel with Recovery for Errors in Messages Sent to an Associated Processor

When a channel sends a message to an associated processor, it puts a sequence number in one field of the message and sets a bit in another field to signal that the message is not a duplicate. The channel makes conventional checks for data transmission errors. If an error is detected, the channel resends the message with the same sequence number and with the bit set to identify a duplicate message. From the standpoint of the associated processor, the duplicate message bit means that a subsequent message with the same sequence number is invalid. The associated processor tests the duplicate bit in each message, and if the duplicate message bit is set it discards the message with the duplicate bit set.

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