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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 much fewer than were the entire switching system 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 acceptable for electromechanical crossbars, it has become less relevant with the advent of VLSI.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 wikiPageRevisionID "597235400".
- Clos_network hasPhotoCollection Clos_network.
- Clos_network subject Category:Network_topology.
- Clos_network subject Category:Switches.
- Clos_network subject Category:Telephone_exchange_equipment.
- Clos_network type Artifact100021939.
- Clos_network type Control103096960.
- Clos_network type Device103183080.
- Clos_network type Instrumentality103575240.
- Clos_network type Mechanism103738472.
- Clos_network type Object100002684.
- Clos_network type PhysicalEntity100001930.
- Clos_network type Switch104372370.
- Clos_network type Switches.
- Clos_network type Whole100003553.
- 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 label "Сеть Клоза".
- Clos_network sameAs m.026k2dl.
- Clos_network sameAs Q4418086.
- Clos_network sameAs Q4418086.
- Clos_network sameAs Clos_network.
- Clos_network wasDerivedFrom Clos_network?oldid=597235400.
- Clos_network depiction Closnetwork.png.
- Clos_network isPrimaryTopicOf Clos_network.
