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Topic: Virtual circuit

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	Virtual circuit - Wikipedia, the free encyclopedia
		A virtual circuit (VC) is a communications arrangement in which data from a source user may be passed to a destination user over more than one real communications circuit during a single period of communication, but the switching is hidden from the users.
		Switched virtual circuits (SVC) are generally set up on a per-call basis and are disconnected when the call is terminated; however, a permanent virtual circuit (PVC) can be established as an option to provide a dedicated circuit link between two facilities.
		A permanent virtual circuit (PVC) is a virtual circuit established for repeated use between the same data terminal equipments (DTE).
	en.wikipedia.org /wiki/Virtual_circuit (236 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.
		Virtual circuit packet switching (VC-switching) is a packet switching technique which merges datagram packet switching and circuit switching to extract both of their advantages.
	www.cs.virginia.edu /~mngroup/projects/mpls/documents/thesis/node8.html (1545 words)

	Virtual Circuit Packet Switching (Site not responding. Last check: 2007-10-21)
		Virtual circuits operate by establishing a formal connection between two devices in communication.
		Virtual circuits are distinguished by the establishment of a logical connection.
		Virtual circuits frequently are employed in conjunction with connection-oriented services, which are discussed later in this chapter.
	www.measureup.com /testobjects/MS_NetEss/5a65c5d.htm (130 words)

	Define virtual circuit - a Whatis.com definition
		A virtual circuit is a circuit or path between points in a network that appears to be a discrete, physical path but is actually a managed pool of circuit resources from which specific circuits are allocated as needed to meet traffic requirements.
		A permanent virtual circuit (PVC) is a virtual circuit that is permanently available to the user just as though it were a dedicated or leased line continuously reserved for that user.
		A switched virtual circuit (SVC) is a virtual circuit in which a connection session is set up for a user only for the duration of a connection.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213297,00.html (188 words)

	Telecommunication circuit - Wikipedia, the free encyclopedia
		In telecommunications, a [tele]communication[s] circuit is any line or circuit on which information is transmitted.
		A dedicated circuit, private circuit, or leased line is a line that is dedicated to only one use.
		On digital lines, a virtual circuit can be created to serve either purpose, while sharing a single physical circuit.
	en.wikipedia.org /wiki/Telecommunication_circuit (261 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		According to a preferred methodology, two of the circuit blocks 502a, 502b are combined such that they are treated, for the purposes of clock layout, as a single circuit block 502.
		Preferably, the two circuit blocks chosen for clustering or grouping together are selected so as to facilitate the later steps of the process 400, including step 403 below, wherein the remaining blocks 502 are divided into a number of groups (preferably four) of roughly equal area, each comprising circuit blocks 502 in a proximate region.
		The method of claim 5, wherein multiple circuit blocks are clustered and treated as a single circuit block for purposes of said method so that the number of circuit blocks will be a power of two.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/54002.010726&ELEMENT_SET=DECL (5555 words)

	OOPic Programmers Guide: CHAPTER 3 - Your first Virtual Circuit
		A Virtual Circuit is a function in an OOPic that appears to be a physical discrete electronic circuit, but is actually the OOPic operating system emulating the functionality of the circuit.
		Virtual Circuits are created by progmatically linking together a set of OOPic Objects in the same methodology as one would physically link together a set of electronic components.
		The function of this process is similar to that of the electrical circuit between a light switch and a light.
	www.oopic.com /pgchap3.htm (1115 words)

	Define circuit - a Whatis.com definition (Site not responding. Last check: 2007-10-21)
		A virtual circuit, sometimes called a logical circuit, is a path between two or more points that seems like a fixed physical path, but actually is one path out of many possible physical paths that can be arranged.
		A permanent virtual circuit(PVC) is a virtual circuit that provides a guaranteed connection between two or more points when needed without having to reserve or commit to a specific physical path in advance.
		A switched virtual circuit (SVC) is similar to a permanent virtual circuit, but allows users to dial in to the network of virtual circuits.
	whatis.techtarget.com /definition/0,,sid9_gci211786,00.html (350 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		the parameter IO is the flow identifier that is to be assigned to the virtual circuit flow at the egress port on which it is emitted from the switching element as a result of routing or switching in the switching node.
		Circuit Client 600, 608 is that the Circuit Manager API 304 is not required to be supported at the Clients 600, 608 for the establishment of virtual circuits.
		The route is defined as a sequence of vertices P. The peak bandwidth of the virtual circuit connection that is to be released and is denoted as circuitBandwidth.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=05/13562.050210&ELEMENT_SET=DECL (7558 words)

	Novell Documentation: Novell Internet Access Server 4.1 - NetWare Link/X.25 Virtual Circuit Service
		An SVC is a dynamically established on-demand virtual circuit that uses call setup and call-clearing procedures.
		Virtual circuit numbers are assigned according to a preset network arrangement, in which zero is reserved for restart and diagnostic packets for all circuits.
		For SVCs, the association between a logical channel identifier and a particular virtual circuit is accomplished at call setup time, when the identifier is chosen from a pool of unused identifiers.
	www.novell.com /documentation/nias41/x25__enu/data/hkjwfvda.html (875 words)

	Method for optimizing a network having virtual circuit routing over virtual paths (US5274643)
		Virtual circuits are routed and grouped into virtual paths during an interactive topology design process.
		Virtual circuits are assigned to virtual paths that provide minimum cost to each pass through a topology design.
		Virtual paths are dispersed into subgroups that minimize bandwidth consumption and maximize routing flexibility.
	www.delphion.com /details?&pn10=US05274643 (271 words)

	PVC (Permanent Virtual Circuit) (Linktionary term)
		A virtual circuit is a pathway through a switched, mesh-type network that appears to be a dedicated, physically connected circuit.
		The virtual circuit is predefined and maintained by the end systems and nodes along the circuit, but the actual pathway through the packet-switched network may change due to routing around downed or busy connections.
		A PVC is a fixed circuit that is defined in advance by a public network carrier (or a network manager on an internal network).
	www.linktionary.com /p/pvc.html (262 words)

	Virtual Circuit Rules (Site not responding. Last check: 2007-10-21)
		Circuit members will upload two entries to their web space on or before the 15th of every odd-numbered month.
		Circuit members will award numerical scores and make useful comments on the entries of all other members.
		As with other circuits, members agree to make their scores and comments before seeing those made by the others.
	www.lovetatting.com /virtrule.htm (537 words)

	SYSTEM MODEL
		A virtual path is established by the network to simplify routing by grouping virtual circuits [8].
		We assume that a virtual path is set up for every source-destination pair, and all virtual circuits using a virtual path are for the same source-destination pair.
		Thus when a call arrives at the access to the network it is assigned a virtual circuit, which is amalgamated on one virtual path with the virtual circuits for other calls from that source to destination.
	www.eeng.dcu.ie /~murphyj/dist-price/node2.html (554 words)

	SuperStack II PathBuilder S330/S310 WAN Access Switches
		A virtual circuit is a bi-directional path between data ports of connecting ATM units.
		A virtual path is an aggregate collection of virtual channels for the purpose of assigning the channels to a single physical layer.
		The parameters that appear on the Add Virtual Circuit screen when you select the CBR module to be a side of a circuit vary, depending on whether you select the V.35 port or one of the T1/E1 ports.
	support.3com.com /infodeli/tools/switches/ss2pb/product/wan_access/s330c15a.htm (6314 words)

	Cisco Sem4 Lesson 6 - FrameRelay
		Virtual circuits are used in Frame Relay and X.25.
		PVC (Permanent Virtual Circuit) - Virtual circuit that is permanently established.
		SVC (Switched Virtual Circuit) - Virtual circuit that is dynamically established on demand and is torn down when transmission is complete.
	www.tele.sunyit.edu /HALF_REVIEW/sem4/6FrameRelay.htm (2218 words)

	Introduction to WAN Technologies
		A virtual circuit is a logical circuit created within a shared network between two network devices.
		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.
		PVC is a permanently established virtual circuit that consists of one mode: data transfer.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/introwan.htm (1383 words)

	No Title
		Circuit switching is a technique to dedicate a circuit through the network to be the communication channel between two devices.
		With heavy traffic circuit switching will block several calls but in a packet switched network all the calls may be accepted but there will be a greater delay in delivery for all of the calls.
		For virtual circuit, time of decision is at the time of establishing the virtual circuit.
	www.rhsmith.umd.edu /is/aqiuol/726f97/mod4csps.html (1993 words)

	Verizon Learning Center - Data Technology - Introduction and Frame Relay - Page 3 of 4
		Secondly, rather than expending the time and computational resources in the network to establish such a virtual circuit, a single 'datagram' packet can be sent to any X.25 device, if it has the full X.25 addresses of the sender and receiver attached to it.
		The other component of the cost to the customer is the virtual circuits which the carrier sets up within the carrier's switches.
		Nor does it have virtual circuits, since each packet is an independent 'datagram' and is routed separately.
	www22.verizon.com /about/community/learningcenter/articles/displayarticle1/0,1727,1134z3,00.html (948 words)

	What is virtual circuit? - A Word Definition From the Webopedia Computer Dictionary
		In this case, the two hosts can communicate as though they have a dedicated connection even though the packets might actually travel very different routes before arriving at their destination.
		An X.25 connection is an example of a virtual circuit.
		Virtual circuits can be either permanent (called PVCs) or temporary (called SVCs).
	www.webopedia.com /TERM/S/virtual_circuit.html (113 words)

	Virtual Circuit (Linktionary term) (Site not responding. Last check: 2007-10-21)
		A virtual circuit is a point-to-point communication link between two end stations on a switched network (ATM, frame relay, IP, or Internet).
		A virtual circuit is designed to emulate the characteristics of a physical circuit on a switched network.
		An example of a physical circuit is the analog telephone line between your home and the telephone company central office.
	www.linktionary.com /v/virtualcircuit.html (155 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The virtual circuit characteristics configured for each PVC must match in the NETBuilder II Bridge/Router, the ATM switch, and the remote end node.
		Virtual circuit identifier (VCID) is a unique user-assigned numeric identifier to be assigned to the PVC for a remote node and represents its configured virtual circuit characteristics.
		The virtual path identifier (VPI) and the virtual channel identifier (VCI) pair that denotes a single point-to-point ATM virtual circuit.
	support.3com.com /infodeli/tools/bridrout/u_guides/html/nb91/reference/atm.ref4.html (442 words)

	Virtual-zener circuit simplifies high-voltage interface - 3/20/2003 - EDN
		The circuit drops exactly 65.58V dc with the component values shown, notwithstanding errors arising from op-amp offset voltages and resistor tolerances (Figure 2 ; please note: This figure has been corrected from the print version).
		The function of the virtual-zener circuit is to provide a regulated, floating dc voltage drop between input and output.
		The input of the circuit, nominally at 70V dc, draws a constant 3.65 mA.
	www.edn.com /article/CA282636.html (449 words)

	EE 4984: Problem Set 5 FAQ (Site not responding. Last check: 2007-10-21)
		The squares are switches for circuit-switched or routers for both virtual circuit packet switching and datagram packet switching.
		For virtual circuit packet switching and datagram packet switching, the message is divided into packets of length P. The number of packets will be ceiling(L/P).
		Note that datagram packet switching and message switching do not require that a circuit or virtual circuit be established prior to transmission.
	fiddle.visc.vt.edu /courses/ee4984/ps_5_faq.html (411 words)

	Define permanent virtual circuit - a Whatis.com definition - see also: PVC (Site not responding. Last check: 2007-10-21)
		A permanent virtual circuit (PVC) is a software-defined logical connection in a network such as a frame relay network.
		In frame relay, the end points and a stated bandwidth called a Committed Information Rate (CIR) constitute a PVC, which is defined to the frame relay network devices.
		Find white papers, products and vendors related to permanent virtual circuit.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214317,00.html (187 words)

	VIRTUAL CIRCUIT (Site not responding. Last check: 2007-10-21)
		A virtual circuit is a method that improves the use of the network because the connections are logical.
		The packets are sent through the network from node to node when the physical path is fixed by a virtual circuit during the connection time.
		With a virtual connection, while packets are guaranteed to be delivered to the destination and delivered in sequence, no physical lines are dedicated to the connection between the hosts-NO USER OWNS A PHYSICAL LINE.
	www2.rad.com /networks/1994/isdn/virt.htm (184 words)

	Configure the Virtual Circuit ID (Site not responding. Last check: 2007-10-21)
		Configure the Virtual Circuit ID You configure a virtual circuit ID on each interface.
		Each virtual circuit ID uniquely identifies the Layer 2 circuit among all the Layer 2 circuits to a specific neighbor.
		The key to identifying a particular Layer 2 circuit on a PE router is the neighbor address and the virtual circuit ID. An LDP-FEC-to-label binding is associated with a Layer 2 circuit based on the virtual circuit ID in the forwarding equivalence class (FEC) and the neighbor that sent this binding.
	www.juniper.net /techpubs/software/junos/junos60/swconfig60-vpns/html/l2circuits-config3.html (128 words)

	Welcome to Adobe GoLive 5 (Site not responding. Last check: 2007-10-21)
		In virtual circuit packet switching, an initial setup phase is used to set up a fixed route between the intermediate nodes for all packets which are exchanged during a session between the end nodes (analogous to the circuit-switched telephony network).
		Delays are more variable than they are with a dedicated circuit, however, since several virtual circuits may compete for the same resources.
		The most common form of virtual circuit network were ATM and X.25, which for a while were commonly used for public packet data networks.
	www.erg.abdn.ac.uk /users/gorry/course/intro-pages/vcanddg.html (376 words)

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