Circuit switched - Definition and Overview

In telecommunication, the term circuit switching has the following meanings:

1. A method of routing traffic between an originator and a destination through switching centers, from local users or from other switching centers, whereby a continuous electrical circuit is established and maintained between the calling and called stations until it is released by one of those stations.

The method of establishing the connection and monitoring its progress and availability may utilize a separate control channel as in the case of ISDN or not as in the case of the Public Switched Telephone Network.

2. A process that, on demand, connects two or more data terminal equipments (DTEs) and permits the exclusive use of a data circuit between them until the connection is released. The acronym CSD (Circuit Switched Data) is also used, as in GSM's original data transfer method HSCSD.

Circuit switching has been used extensively for the public switched telephone network.

Roughly the opposite of packet switching.

See also

• Federal Standard 1037C
• MIL-STD-188

External links

• Netheads vs Bellheads by Steve Steinberg (http://www.wired.com/wired/archive/4.10/atm.html)
• Out of Sight, Out of Mind, Big Old Stupid Telephone Companies Are Throwing Away Their Only Real Asset (http://www.pbs.org/cringely/pulpit/pulpit20040624.html) Opinion piece on packet switching vs circuit switching
• VoIP Phones - Circuit Switching (http://www.voip.mn/circuit-switching.html)