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US5428616A
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Measuring packet transmission delays
Assignee: Cray Communications Ltd
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Filing: 1992-11-23
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Granted: 1995-06-27
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Expires: 2012-11-23
Abstract
Abstract A packet transmission system comprising a network of one or more nodes (1) each comprising a number of inputs connected via packet switching means to a number of outputs each of which has storage means (11) associated with it in which to store a queue of packets to be outputted; characterized in that each node (1) is provided with timer means (14) to measure the time each packet spends in a queue of said storage means (11); and stamping means (12) to add to a time stamp field (TS) of each packet before it is outputted from the node, the time the packet has spent in a queue as measured by the timer means (14).
Inventors
- 👤 Anthony V. Field
- 👤 Jason B. Brent
- 👤 Edward Hatala
- 👤 John Timms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:01
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/20; H04L49/205; H04L49/206; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5638; H04L2012/5646; H04L2012/5649
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A method of measuring the transmission delay of a packet in a network of a plurality of nodes comprising measuring the time which the packet spends in an output queue of each node and adding this time to a time stamp field of the packet so as to accumulate in said time stamp field a value of the total time spent by the packet in the output queues only of successive nodes across the network.
Claim 2
Independent Claim
75 words
A method of measuring the transmission delay of a packet in a network of a plurality of nodes comprising measuring the time which the packet spends in an output queue of each node and adding this time to a time stamp field of the packet so as to accumulate in said time stamp field a value of the total time spent by the packet in the output queues only of successive nodes across the network.
Claim 3
Dependent Claim
133 words
A packet transmission system comprising a network of a plurality of nodes, each node comprising a number of inputs connected via packet switching means to a number of outputs, storage means associated with each output in which to store a queue of packets to be outputted, timer means associated with each output to measure the time each packet spends in a queue of said storage means, and stamping means provided to add to a time stamp field of each packet only that time that the packet has spent in said queue as measured by the timer means before it is outputted from the node so as to accumulate in said time stamp field a value of the total time spent by the packet in output queues only of successive nodes across the network.
Claim 4
Dependent Claim
133 words
A packet transmission system comprising a network of a plurality of nodes, each node comprising a number of inputs connected via packet switching means to a number of outputs, storage means associated with each output in which to store a queue of packets to be outputted, timer means associated with each output to measure the time each packet spends in a queue of said storage means, and stamping means provided to add to a time stamp field of each packet only that time that the packet has spent in said queue as measured by the timer means before it is outputted from the node so as to accumulate in said time stamp field a value of the total time spent by the packet in output queues only of successive nodes across the network.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |