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- Clos_network abstract "In the field of telecommunications, a Clos network is a kind of multistage circuit switching network, first formalized by Charles Clos in 1952, which represents a theoretical idealization of practical multi-stage telephone switching systems. Clos networks are required when the physical circuit switching needs to exceed the capacity of the largest feasible single crossbar switch. The key advantage of Clos networks is that the number of crosspoints (which make up each crossbar switch) required can be far fewer than would be the case if the entire switching system were implemented with one large crossbar switch. When the Clos network was first devised, the number of crosspoints was a reasonable approximate indication of the total cost of the switching system. While this was important for electromechanical crossbars, it became less relevant with the advent of VLSI, wherein the interconnects often could be implemented either directly in silicon, or within a relatively small cluster of boards. However, the advent of complex data centers, with huge interconnect structures, each based on optical fiber links, means that they are again important. Clos networks have three stages: the ingress stage, middle stage, and the egress stage. Each stage is made up of a number of crossbar switches (see diagram below), often just called crossbars. Each call entering an ingress crossbar switch can be routed through any of the available middle stage crossbar switches, to the relevant egress crossbar switch. A middle stage crossbar is available for a particular new call if both the link connecting the ingress switch to the middle stage switch, and the link connecting the middle stage switch to the egress switch, are free.Clos networks are defined by three integers n, m, and r. n represents the number of sources which feed into each of r ingress stage crossbar switches. Each ingress stage crossbar switch has m outlets, and there are m middle stage crossbar switches. There is exactly one connection between each ingress stage switch and each middle stage switch. There are r egress stage switches, each with m inputs and n outputs. Each middle stage switch is connected exactly once to each egress stage switch. Thus, the ingress stage has r switches, each of which has n inputs and m outputs. The middle stage has m switches, each of which has r inputs and r outputs. The egress stage has r switches, each of which has m inputs and n outputs.".
- Clos_network thumbnail Closnetwork.png?width=300.
- Clos_network wikiPageID "7919595".
- Clos_network wikiPageLength "12416".
- Clos_network wikiPageOutDegree "20".
- Clos_network wikiPageRevisionID "683172838".
- Clos_network wikiPageWikiLink Banyan_switch.
- Clos_network wikiPageWikiLink Binomial_distribution.
- Clos_network wikiPageWikiLink Category:Network_topology.
- Clos_network wikiPageWikiLink Category:Networking_hardware.
- Clos_network wikiPageWikiLink Category:Telephone_exchange_equipment.
- Clos_network wikiPageWikiLink Charles_Clos.
- Clos_network wikiPageWikiLink Christian_Jacobaeus.
- Clos_network wikiPageWikiLink Christian_Jacobæus.
- Clos_network wikiPageWikiLink Circuit_switching.
- Clos_network wikiPageWikiLink Crossbar_switch.
- Clos_network wikiPageWikiLink Fat_tree.
- Clos_network wikiPageWikiLink File:Closnetwork.png.
- Clos_network wikiPageWikiLink Halls_marriage_theorem.
- Clos_network wikiPageWikiLink Nonblocking_minimal_spanning_switch.
- Clos_network wikiPageWikiLink Omega_network.
- Clos_network wikiPageWikiLink Telecommunication.
- Clos_network wikiPageWikiLink Telecommunications.
- Clos_network wikiPageWikiLink Very-large-scale_integration.
- Clos_network wikiPageWikiLink Václav_E._Beneš.
- Clos_network wikiPageWikiLink File:Benesnetwork.png.
- Clos_network wikiPageWikiLinkText "Benes network".
- Clos_network wikiPageWikiLinkText "Beneš network".
- Clos_network wikiPageWikiLinkText "Clos Network".
- Clos_network wikiPageWikiLinkText "Clos Switch".
- Clos_network wikiPageWikiLinkText "Clos network".
- Clos_network wikiPageWikiLinkText "Clos topology".
- Clos_network wikiPageWikiLinkText "Clos_network#Bene.C5.A1_network_.28m_.3D_n_.3D_2.29".
- Clos_network wikiPageWikiLinkText "Clos_network#Clos_networks_with_more_than_three_stages".
- Clos_network wikiPageWikiLinkText "clos network".
- Clos_network wikiPageWikiLinkText "clos topology".
- Clos_network hasPhotoCollection Clos_network.
- Clos_network wikiPageUsesTemplate Template:See_also.
- Clos_network subject Category:Network_topology.
- Clos_network subject Category:Networking_hardware.
- Clos_network subject Category:Telephone_exchange_equipment.
- Clos_network hypernym Kind.
- Clos_network type Component.
- Clos_network type Exchange.
- Clos_network type Switch.
- Clos_network type Thing.
- Clos_network comment "In the field of telecommunications, a Clos network is a kind of multistage circuit switching network, first formalized by Charles Clos in 1952, which represents a theoretical idealization of practical multi-stage telephone switching systems. Clos networks are required when the physical circuit switching needs to exceed the capacity of the largest feasible single crossbar switch.".
- Clos_network label "Clos network".
- Clos_network seeAlso Nonblocking_minimal_spanning_switch.
- Clos_network sameAs m.026k2dl.
- Clos_network sameAs Сеть_Клоза.
- Clos_network sameAs Q4418086.
- Clos_network sameAs Q4418086.
- Clos_network wasDerivedFrom Clos_network?oldid=683172838.
- Clos_network depiction Closnetwork.png.
- Clos_network isPrimaryTopicOf Clos_network.
