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In [[Telecommunicationtelecommunication]] and [[Computercomputer networking]], '''time-driven switching''' (TDS) is a node by node time variant implementation of [[Circuitcircuit switching]], where the propagating datagram is shorter in space than the distance between source and destination. With TDS it is no longer necessary to own a complete circuit between source and destination, but only the fraction of circuit where the propagating datagram is temporarily located.
TDS adds flexibility and capacity to Circuit Switchedcircuit-switched networks but requires precise synchronization among nodes and propagating datagrams.
Datagrams are formatted according to schedules that depend on [[Qualityquality of service]] and availability of switching nodes and physical links. RespectIn respect to [[Circuitcircuit switching]], the added time dimension introduces additional complexity to network management. Like [[Circuitcircuit switching]], TDS operates without buffers and header processing according to the [[pipeline forwarding]] principle; therefore an all optical implementation with [[Opticaloptical fibersfiber]]s and [[Opticaloptical Switchesswitch]]es is possible with low cost. The TDS concept itself pervades and is applicable with advantage to existing data switching technologies, including [[Packetpacket switching]], where packets, or sets of packets become the datagrams that are routed through the network.{{cn|reason=doubtful that concept could work on packet switching|date=February 2023}}
TDS has been invented in 2002 by [http://www.mariobaldi.net Prof. Mario Baldi] and profProf. [[Yoram Ofek]] of [http://www.synchrodyne.com Synchrodyne Networks, Inc.] that is the assignee of several patents issued by both the [[United States Patent and Trademark Office]] and the [[European Patent Office]].<ref>http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=synchrodyne&FIELD1=ASNM&co1=AND&TERM2=&FIELD2=&d=PTXT several patents] issued by both the [[United States Patent and Trademark Office]] and the [[European Patent Office]].</ref>
== References ==
{{Refs}}
* M. Baldi, Y. Ofek, "[http://staff.polito.it/mario.baldi/publications/icc2002.pdf Fractional Lambda Switching]," IEEE International Conference on Communications (ICC2002), Optical Networking Symposium, New York, NY, USA, Apr. 2002, pp. 2692-2696.
* M. Baldi, Y. Ofek, "Fractional Lambda Switching - Principles of Operation and Performance Issues," SIMULATION: Transactions of The Society for Modeling and Simulation International, Vol. 80, No. 10, Oct. 2004, pp. 527-544
* WebLink[http://sim.sagepub.com/cgi/content/abstract/80/10/527?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=baldi&searchid=1138355387278_14&FIRSTINDEX=0&sortspec=relevance&journalcode=spsim]. ▼
* WebLink
▲[http://sim.sagepub.com/cgi/content/abstract/80/10/527?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=baldi&searchid=1138355387278_14&FIRSTINDEX=0&sortspec=relevance&journalcode=spsim].
==See also==
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