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US5469446A
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Retry filter and circulating echo method and apparatus
Assignee: International Business Machines Corp
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Filing: 1994-01-26
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Granted: 1995-11-21
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Expires: 2014-01-26
Abstract
Abstract A retry filter and circulating echo apparatus and method are provided for a digital processing system of the type having multiple nodes that communicate via one or more unidirectional rings. The nodes of a digital processing system communicate packets to each other over a unidirectional ring bus. An origination node allocates a sequence identification and transmits a packet to a destination node, which generates a first echo packet and also sets a packet filter indication to drop any further copies of that packet. The first echo packet is sent to the origination node as a confirmation. The origination node generates a second echo packet and sends the generated second echo packet onward to the destination node again as an indication that the packet will not be retransmitted. The destination node transmits a third echo packet as an indication that the sequence can be deallocated.
Inventors
- 👤 Ronald E. Fuhs
- 👤 William A. Hammond, Jr.
- 👤 George W. Nation
- 👤 Steven L. Rogers
- 👤 John C. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:58
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; G; G08; G08C; G08C25/00; G08C25/02; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04L1/187; H04L1/1829; H04L1/1848; H04L1/188; H04L2001/0092; H04L2001/0095
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A method of processing packets communicated between nodes via at least one unidirectional ring, said method comprising the steps of: allocating a sequence identification for a packet and sending said packet including said allocated sequence identification at an origination node; receiving said packet at a destination node; establishing a packet filter utilizing said allocated sequence identification and generating and sending a first echo packet to said origination node responsive to receiving said packet at said destination node; receiving said first echo packet at said origination node; generating and sending a second echo packet to said destination node responsive to said received first echo packet at said origination node; receiving said second echo packet at said destination node; and generating and sending a third echo packet to said origination node responsive to receiving said second echo packet at said destination node.
Claim 2
Independent Claim
140 words
A method of processing packets communicated between nodes via at least one unidirectional ring, said method comprising the steps of: allocating a sequence identification for a packet and sending said packet including said allocated sequence identification at an origination node; receiving said packet at a destination node; establishing a packet filter utilizing said allocated sequence identification and generating and sending a first echo packet to said origination node responsive to receiving said packet at said destination node; receiving said first echo packet at said origination node; generating and sending a second echo packet to said destination node responsive to said received first echo packet at said origination node; receiving said second echo packet at said destination node; and generating and sending a third echo packet to said origination node responsive to receiving said second echo packet at said destination node.
Claim 3
Dependent Claim
43 words
A method as recited in claim 1 further includes the step of deallocating said sequence identification for said packet responsive to a predetermined timeout interval having elapsed after sending said second echo packet without receiving said third echo packet at said origination node.
Claim 4
Dependent Claim
28 words
A method as recited in claim 1 further includes the step of deallocating said established packet filter responsive to said received second echo packet at said destination node.
Claim 5
Dependent Claim
30 words
A method as recited in claim 1 further includes the step of deallocating said sequence identification for said packet responsive to said received third echo packet at said origination node.
Claim 6
Dependent Claim
40 words
A method as recited in claim 1 further includes the step of deallocating said established packet filter responsive to a predetermined timeout interval having elapsed after establishing said packet filter without receiving said second echo packet at said destination node.
Claim 7
Dependent Claim
35 words
A method as recited in claim 1 further includes the step of sending a retry packet responsive to a predetermined retry timeout interval having elapsed without receiving said first echo packet at said origination node.
Claim 8
Dependent Claim
33 words
A method as recited in claim 6 further includes the step of generating and sending a first echo packet to said origination node responsive to receiving said retry packet at said destination node.
Claim 9
Dependent Claim
147 words
A retry filter and circulating echo apparatus for a digital processing system of the type having multiple nodes that communicate via one or more unidirectional rings, said apparatus comprising: means for allocating a sequence identification for a packet and for sending said packet including said allocated sequence identification and at an origination node; means for establishing a packet filter and for generating and for sending a first echo packet to said origination node responsive to receiving said packet at a destination node; said packet filter for checking said allocated sequence identification and for deleting retransmissions of said packet; means for generating and for sending a second echo packet to said destination node responsive to said received first echo packet at said origination node; and means for generating and sending a third echo packet to said origination node responsive to receiving said second echo at said destination node.
Claim 10
Dependent Claim
147 words
A retry filter and circulating echo apparatus for a digital processing system of the type having multiple nodes that communicate via one or more unidirectional rings, said apparatus comprising: means for allocating a sequence identification for a packet and for sending said packet including said allocated sequence identification and at an origination node; means for establishing a packet filter and for generating and for sending a first echo packet to said origination node responsive to receiving said packet at a destination node; said packet filter for checking said allocated sequence identification and for deleting retransmissions of said packet; means for generating and for sending a second echo packet to said destination node responsive to said received first echo packet at said origination node; and means for generating and sending a third echo packet to said origination node responsive to receiving said second echo at said destination node.
Claim 11
Dependent Claim
28 words
Apparatus as recited in claim 8 further includes: means for deallocating said sequence identification for said packet responsive to said received third echo packet at said origination node.
Claim 12
Dependent Claim
41 words
Apparatus as recited in claim 8 further includes: means for deallocating said sequence identification for said packet responsive to a predetermined timeout interval having elapsed after sending said second echo packet without receiving said third echo packet at said origination node.
Claim 13
Dependent Claim
26 words
Apparatus as recited in claim 8 further includes: means for deallocating said established packet filter responsive to said received second echo packet at said destination node.
Claim 14
Dependent Claim
35 words
Apparatus as recited in claim 8 further includes: means for deallocating said established packet filter responsive to a predefined timeout after establishing said packet filter without receiving said second echo packet at said destination node.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |