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Topic: Circuit switching

Related Topics

Switching center

Remote concentrator

Packet switching

Telephone exchange

Public switched telephone network

PABX

Pair gain system

PDH

List of switches

Digital Subscriber Line

Node (networking)

Datagram Congestion Control Protocol

Internet Protocol

ETSI

Telecommunication

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	Circuit switching - Wikipedia, the free encyclopedia
		In telecommunications, a circuit switching network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate.
		Circuit switching can be relatively inefficient because capacity is wasted on connections which are set up but are not in continuous use (however momentarily).
		Circuit switching contrasts with packet switching which splits traffic data (for instance, digital representation of sound, or computer data) into chunks, called packets, that are routed over a shared network.
	en.wikipedia.org /wiki/Circuit_switching (549 words)

	Packet switching - Wikipedia, the free encyclopedia
		This contrasts with the other principal paradigm, circuit switching, which sets up a dedicated connection between the two nodes for their exclusive use for the duration of the communication.
		Circuit switched networks, such as the Public Switched Telephone Network (PSTN), also perform routing to find paths for circuits over which large amounts of data can be sent without continually repeating the complete destination address.
		Packet switching influenced the development of the Actor model of concurrent computation in which messages sent to the same address may be delivered in an order different from the order in which they were sent.
	en.wikipedia.org /wiki/Packet-switched (1109 words)

	Packet switching
		Circuit Switching is ideal when data must be transmitted quickly, must arrive in sequencing order and at a constant arrival rate.
		The inputs to the switch are the inputs to the elements in the first column, and the outputs of the last column are the outputs from the switch.
		The knockout switch is a fully connected architecture which attempts to combine the implementation simplicity of input queuing (buffer complexity is linear in the number of ports) with the throughput performance of output queuing (permitted input load and saturation throughput both approaching 100%).
	www2.rad.com /networks/2004/PacketSwitching/main.htm (3713 words)

	Switching technology
		In circuit switching, resources remain allocated during the full length of a communication, after a circuit is established and until the circuit is terminated and the allocated resources are freed.
		During circuit establishment, the set of switches and links on the path between the sender and the receiver is determined and messages are exchanged on all the links between the two end hosts of the communication in order to make the resource allocation and build the routing tables.
		The circuit identifier (a range of frequencies in FDM or a time slot position in a TDM frame) is changed by each switch at forwarding time so that switches do not need to have a complete knowledge of all circuits established in the network but rather only local knowledge of available identifiers at a link.
	www.cs.virginia.edu /~mngroup/projects/mpls/documents/thesis/node8.html (1545 words)

	I, Cringely . June 24, 2004 - Out of Sight, Out of Mind \| PBS (Site not responding. Last check: 2007-11-06)
		The beauty of packet switching is that if I need a lot of packets or a few, I can have just what I need, with all the of the intelligence of the network running at my house and at some server, but almost none of it at the phone company that connects us together.
		Circuit switching, on the other hand, is a network that knows what it is doing: It connects telephones to telephones.
		Circuit switching inherently gives you all the advantage of on-demand, like the ability to view a show when you like, to fast-forward, stop, or reverse it.
	www.pbs.org /cringely/pulpit/pulpit20040624.html (1843 words)

	Switching Principles
		There are three types of switching used in networks today: circuit switching, used in voice networks; packet switching, used in data networks; and cell relay, now being deployed for both voice and data transmission.
		Circuit switching is not an efficient method for routing any kind of data, whether it is digital voice or user data.
		The circuit is wasted much of the time because no transmission is using the bandwidth of the circuit 100 percent of the time.
	www.tekelec.com /ss7/protocols/switching.asp (487 words)

	Voip - Voice Over IP - Circuit Switching
		Circuit switching is the extremely dependable, but partially inefficient process which traditional phone systems use to connect calls.
		The circuit between the two phones remains open for the duration of this period.
		The switches between the two states would connect segments of copper wire from one end of the country to the other.
	www.voip.mn /circuit-switching.html (554 words)

	Packet Switching : galaxyphones (Site not responding. Last check: 2007-11-06)
		Other packets from other calls race upon these circuits as well, making the most use of each track or path, quite unlike the circuit switched calls that occupy a single single path to the exclusion of all others.
		Packet Video is promising video clips at 60Kbs over conventional circuit switched cellular radio channels, indeed, they say they are platform independent, that is, their technology will work over whatever radio technology a carrier is using.
		Replacing circuit switched switches with packet switches accross the country would be a monumental task, requiring billions of dollars over years and years.
	www.galaxyphones.co.uk /switching.asp (2000 words)

	HighBeam Encyclopedia - digital circuit
		That is contrasted with analog circuits, whose voltages or other quantities vary in a continuous manner.
		The simplest forms of digital circuits are built from logic gates, the building blocks of the digital computer.
		Digital circuits are more immune to noise than analog circuits, and digital signals can be stored and duplicated without degradation (see compact disc).
	www.encyclopedia.com /html/d/digitlcir.asp (445 words)

	Circuit Switching (Site not responding. Last check: 2007-11-06)
		Circuit switching is the most familiar technique used to build a communications network.
		After completion of the connection, a signal confirming circuit establishment (a connect signal in the diagram) is returned; this flows directly back to node A with no search delays since the circuit has been established.
		After data transfer, the circuit is disconnected; a simple disconnect phase is included after the end of the data transmission.
	www.erg.abdn.ac.uk /users/gorry/course/intro-pages/cs.html (372 words)

	Circuit-Switching Services (Linktionary term)
		Circuit switching, as opposed to packet switching, sets up a dedicated communication channel between two end systems.
		The advantage of switched circuit is that you can connect to a variety of preconfigured locations rather than a single location.
		DTM (Dynamic Synchronous Transfer Mode) is a form of circuit switching for fiber-optic networks that employs TDM (time division multiplexing) in a new way that dynamically reallocates available bandwidth to users that need it.
	www.linktionary.com /c/circuit_switching.html (703 words)

	Message Switching (Site not responding. Last check: 2007-11-06)
		Message lengths are slightly longer than they are in circuit switching, after establishment of the circuit, since header information must be included with each message; the header includes information identifying the destination as well as other types of information.
		Most message switched networks do not use dedicated point-to-point links and therefore a call must be set-up using a circuit switched network.
		Although message switching is still used for electronic mail and telex transmission, it has largely been replaced by packet switching (in fact, most electronic mail is carried using message switching with the links between message switches provided by packet or circuit-switched networks).
	www.erg.abdn.ac.uk /users/gorry/course/intro-pages/ms.html (441 words)

	Howstuffworks "How VoIP Works"
		Circuit switching is a very basic concept that has been used by telephone networks for more than 100 years.
		The call is routed through the switch at your local carrier to the party you are calling.
		While circuit switching keeps the connection open and constant, packet switching opens a brief connection -- just long enough to send a small chunk of data, called a packet, from one system to another.
	www.howstuffworks.com /ip-telephony1.htm (971 words)

	Moeller - Industrial Automation - Circuit-Breakers, Switch-Disconnectors up to 1600 A
		Four switches with four universal levels of switching capacity form a comprehensive range, from the competitively priced 25 kA for small sub-distribution boards, up to 150 kA switching capacity for complex high-power systems.
		In the event of a short circuit, the special shape and materials selected produce repelling magnet power that pushes the contacts apart in a fraction of a sine wave.
		Switching capacities up to 150 kA and operational voltages up to 690 V can be managed without difficulty.
	www.moeller.net /en/industry/switchgear/power_communication/circuit_breaker_new1600a_start/index.jsp (303 words)

	ARPANET - Wikipedia, the free encyclopedia
		Packet switching, now the dominant basis for both data and voice communication worldwide, was a new and important concept in data communications.
		Previously, data communications was based on the idea of circuit switching, as in the old typical telephone circuit, where a dedicated circuit is tied up for the duration of the call and communication is only possible with the single party on the other end of the circuit.
		With packet switching, a system could use one communication link to communicate with more than one machine by assembling data into packets.
	en.wikipedia.org /wiki/ARPANET (3016 words)

	6.2 Circuit switching in the Internet
		The first is Optical Burst Switching -- OBS -- (Section 6.3), in which a router at the edge of the network queues packets up to a threshold and then establishes a circuit with an explicit or implicit connection release time (also known as a burst).
		In this respect, TCP Switching is similar to IP Switching (Section 6.2.7), in which flows trigger the establishment of ATM virtual circuits.
		This use of a hierarchy of circuits is similar to the one proposed in Chapter 5.
	klamath.stanford.edu /~molinero/thesis/html/pmf_thesis_node39.html (2773 words)

	Circuit Switching (Site not responding. Last check: 2007-11-06)
		Circuit switching establishes a path that remains fixed for the duration of a connection (see
		Much as telephone switching equipment establishes a route between two telephones, circuit-switching networks establish a path through the internetwork when the devices initiate a conversation.
		Circuit switching provides devices with a dedicated path and a well-defined bandwidth, but circuit switching is not free of disadvantages.
	www.measureup.com /testobjects/MS_NetEss/5a65d5f.htm (104 words)

	Vitesse - Technologies - Circuit Switching
		Circuit switching is the most common technique used to build communication networks worldwide.
		Circuit switching entails network communication where dedicated channels/circuits are established for the duration of a transmission.
		The most ubiquitous and well-known circuit switching network is the telephone system, which links together wire segments to create a single unbroken line for each telephone call.
	www.vitesse.com /technologies/index.php?id=10 (660 words)

	Bridge rectifier circuit - Patent 4535203
		A telephone instrument according to claim 4, the rectifier circuit providing a DC supply for electronic circuitry within the instrument, and including an isolating switch arranged to isolate the DC output of the rectifier circuit from the circuitry in the instrument in response to dialling signals generated in the instrument.
		According to one aspect of the invention there is provided a bridge rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide either full wave rectification of an a.c.
		According to another aspect of the invention there is provided a rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide either full wave rectification of an a.c.
	www.freepatentsonline.com /4535203.html (2218 words)

	MRV Communications, Inc. - Ethernet Circuit
		Traditional Ethernet switches for corporate Local Area Networks (LANs) are designed to forward frames, but are incapable of treating a stream of frames as belonging to a specific flow of information (a circuit).
		Once the circuit is defined, actions and procedures are performed based on a database of circuit entries held internally within the switch’s hardware.
		When the Ethernet Circuit technology is extended into the entire access network and backbone, service providers can see additional benefits, including better use of technician’s time, and operational cost savings from avoiding lost revenue from inactivated services and the need to purchase costly new systems.
	www.mrv.com /technology/ethernet_circuit.php (1168 words)

	Introduction to WAN Technologies
		Switched circuits allow data connections that can be initiated when needed and terminated when communication is complete.
		Data transfer involves transmitting data between the devices over the virtual circuit, and the circuit termination phase involves tearing down the virtual circuit between the source and destination devices.
		However, in dial backup, the switched circuit is used to provide backup service for another type of circuit, such as point-to-point or packet switching.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/introwan.htm (1383 words)

	Transmission circuit, circuit switching, extended superframe
		Circuit switching is used to provide a link for a particular call and levels of quality line types can be offered by the telephone companies e.g.
		The switch routes the call from this point through the digital switch network using the Management (M)-Plane protocol called Signalling System Number 7 (SS7) which is a form of CCS.
		SS7 sends messages to the switch which is connected to the destination phone and this far end switch sends a Control (C)-Plane message that rings the far end phone.
	www.rhyshaden.com /transm.htm (2507 words)

	Privateline.com: Packet and circuit switching
		To improve video delivery, the IT world is moving toward switched circuits and away from routers.
		Gilder does not address the voice delay problem inherent in packet switching, leaving the reader thinking that there are no drawbacks to voice over packet.
		But if he maintained that packet could not be substituted for circuit switching in the PSTN because of call quality, well, that man would be right, especially for the times.
	www.privateline.com /Switching/packet.html (2658 words)

	Packet Switching
		Packet switching is favored over circuit switching for many different reasons.
		It is more reliable than circuit switching because if a particular circuit in the network should fail, the routers in the network simploy route data units over different circuits, taking a different route altogether.
		If a circuit fails in the middle of a transmission, the entire connection must be released and a new one established, which means the conversation must start over again (think of being disconnected from a telephone call; the whole process of connecting must be repeated).
	www.tekelec.com /ss7/protocols/switching2.asp (387 words)

	Circuit Switching vs. Packet Switching
		In principle, circuit switching and packet switching both are used in high-capacity networks.
		So when we’re talking about circuit switching or packet switching, we are more and more talking about doing it on a switch.
		A switch is very like a bridge in that is usually a layer 2 device that looks to MAC addresses to determine where data should be directed.
	www.cramsession.com /articles/files/circuit-switching-vs-pack-9162003-1256.asp (819 words)

	Packet Switching vs. Circuit Switching (Site not responding. Last check: 2007-11-06)
		In a circuit switched network there is a physical end to end connection created between the communicating parties.
		This connection is maintained for the duration of the call and is of a fixed data rate.
		In packet switching there is no dedicated end to end connection between communicating parties.
	www.dsg.cs.tcd.ie /CHI/lecture3/4_intro_wans/sld005.htm (57 words)

	Ericsson Circuit switching
		At the same time, the circuit switched networks are becoming older and costlier to maintain.
		Ericsson has a modern and competitve portfolio for circuit switching centered around AXE Enabler 1.0 (core) and Ericsson Access Ramp (access).
		AXE is the world's most deployed switching system and has been installed in more than 140 countries for both wireline operators and mobile operators.
	www.ericsson.com /products/hp/Circuit_switching_pa.shtml (173 words)

	Circuit Switching
		While it is available for use, resources and capacity on the links between the equipment are dedicated to the use of the circuit.
		After completion of the connection, a signal confirming circuit establishment is returned.
		Trade-offs between circuit switching and other types of switching depend on switching times.
	cbdd.wsu.edu /edev/Kenet_ToT/Resources/Other/TR502/page37.htm (327 words)

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