97:, and thus RTT is twice the latency in the network plus a processing delay at the destination. The other sources of delay in a network that make up the network latency are processing delay in transmission, propagation time, transmission time and queueing time. Propagation time is dependent on distance. Transmission time for a message is proportional to the message size divided by the bandwidth. Thus higher bandwidth networks will have lower transmission time, but the propagation time will remain unchanged, and so RTT does fall with increased bandwidth, but the delay increasingly represents propagation time.
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367:, which takes standard deviation into account as well. Once a new RTT is calculated, it is entered into the equation above to obtain an average RTT for that connection, and the procedure continues for every new calculation.
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RTT is a measure of the amount of time taken for an entire message to be sent to a destination and for a reply to be sent back to the sender. The time to send the message to the destination in its entirety is known as the
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close to 1 makes the weighted average immune to changes that last a short time (e.g., a single segment that encounters long delay). Choosing a value for
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74:. However, ping time may differ from experienced RTT with other protocols since the payload and priority associated with
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261:{\displaystyle \mathrm {RTT} =\alpha \cdot \mathrm {old\_RTT} +(1-\alpha )\cdot \mathrm {new\_round\_trip\_sample} }
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is the length of time it takes for a signal to travel in one direction and is often approximated as half the RTT.
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the amount of time it takes for acknowledgement of that signal having been received. This time delay includes
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close to 0 makes the weighted average respond to changes in delay very quickly. This was improved by the
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Time required to receive a response to a query across a communication system
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Internetworking with TCP/IP - Principles, Protocols and
Architecture
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62:. In the context of computer networks, the signal is typically a
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Networks with both high bandwidth and a high RTT (and thus high
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messages used by ping may differ from that of other traffic.
449:'s Institute for Telecommunication Sciences, archived from
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50:) is the amount of time it takes for a signal to be sent
474:(4th ed.). Boston: McGraw-Hill Higher Education.
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require a special protocol design. One example is the
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470:Forouzan, Behrouz A.; Fegan, Sophia Chung (2007).
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533:(4th ed.). Prentice Hall. p. 226.
119:The RTT was originally estimated in TCP by:
66:. RTT is commonly used interchangeably with
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316:{\displaystyle 0\leq \alpha <1}
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291:is constant weighting factor (
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495:Brian Heder (May 6, 2014),
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497:"Are your pipes too big?"
365:Jacobson/Karels algorithm
566:Telecommunication theory
385:Wi-Fi positioning system
323:). Choosing a value for
108:at any given time. Such
356:{\displaystyle \alpha }
336:{\displaystyle \alpha }
284:{\displaystyle \alpha }
114:TCP window scale option
102:bandwidth-delay product
60:communication endpoints
407:Minimum-Pairs Protocol
383:are the basis for the
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438:Round-trip delay time
402:Latency (engineering)
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32:telecommunications
18:Round-trip latency
540:978-0-13-018380-4
443:Boulder, Colorado
397:Lag (video games)
110:long fat networks
56:propagation times
16:(Redirected from
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527:Douglas E. Comer
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72:ping command
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64:data packet
555:Categories
513:2016-01-09
457:2021-05-29
423:References
351:α
331:α
305:α
302:≤
279:α
237:_
222:_
204:_
191:⋅
185:α
182:−
160:_
147:⋅
144:α
68:ping time
529:(2000).
391:See also
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379:using
271:where
571:Light
377:Wi-Fi
371:Wi-Fi
42:) or
535:ISBN
476:ISBN
308:<
76:ICMP
52:plus
48:RTT
40:RTD
30:In
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.