Virtual Circuit Multiplexing
- Virtual Circuit Multiplexing
Virtual Circuit Multiplexing or VC-MUX is one of the two (the other being LLC encapsulation) mechanisms for identifying the protocol carried in ATM Adaptation Layer 5 (AAL5) frames specified by RFC 2684, Multiprotocol Encapsulation over ATM.
With virtual circuit multiplexing, the communicating hosts agree on the high-level protocol for a given circuit. It has the advantage of not requiring additional information in a packet, which minimizes the overhead. For example, if the hosts agree to transfer IP, a sender can pass each datagram directly to AAL5 to transfer, nothing needs to be sent besides the datagram and the AAL5 trailer. This tends to reduce fragmentation overhead (e.g., the an IPv4 datagram containing a TCP ACK-only packet with neither IP nor TCP options exactly fits into a single cell). The chief disadvantage of such a scheme lies in duplication of virtual circuits: a host must create a separate virtual circuit for each high-level protocol if more than one protocol is used. Because most carriers charge for each virtual circuit, customers try to avoid using multiple circuits because it adds unnecessary cost.
It is commonly used in conjunction with PPPoE and PPPoA which are used in various xDSL implementations.
Wikimedia Foundation.
2010.
Look at other dictionaries:
Virtual circuit — In telecommunications and computer networks, a virtual circuit (VC), synonymous to virtual connection and virtual channel, is a connection oriented communication service that is delivered by means of packet mode communication. After a connection… … Wikipedia
Circuit switching — is a methodology of implementing a telecommunications network in which two network nodes establish a dedicated communications channel (circuit) through the network before the nodes may communicate. The circuit guarantees the full bandwidth of the … Wikipedia
Virtual LAN — A virtual LAN, commonly known as a VLAN, is a group of hosts with a common set of requirements that communicate as if they were attached to the Broadcast domain, regardless of their physical location. A VLAN has the same attributes as a physical… … Wikipedia
Statistical multiplexing — is a type of communication link sharing, very similar to Dynamic bandwidth allocation (DBA). In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bit rate digital channels or data streams. The link… … Wikipedia
ATM Adaptation Layer 5 — (AAL5) est une couche d adaptation ATM utilisée pour envoyer des paquets de longueur variable allant jusqu à 65 535 octets sur un réseau Asynchronous Transfer Mode (ATM). Contrairement à la plupart des trames réseau, qui placent les… … Wikipédia en Français
Logical Link Control — According to the IEEE 802 family of standards, Logical Link Control (LLC) is the upper sublayer of the OSI Data Link Layer. The LLC is the same for the various physical media (such as Ethernet, token ring, and WLAN).The LLC sublayer is primarily… … Wikipedia
Liste der Telekommunikationsstandards — Liste von Standards und Richtlinien aus der Telekommunikation. Inhaltsverzeichnis 1 ETSI 1.1 Nomenklatur 1.1.1 derzeit gültige Nomenklatur 1.1.2 vorherige Nomenklatur … Deutsch Wikipedia
Synchronous optical networking — (SONET) and Synchronous Digital Hierarchy (SDH), are two closely related multiplexing protocols for transferring multiple digital bit streams using lasers or light emitting diodes (LEDs) over the same optical fiber. The method was developed to… … Wikipedia
Packet switching — is a digital networking communications method that groups all transmitted data – regardless of content, type, or structure – into suitably sized blocks, called packets. Packet switching features delivery of variable bit rate data streams… … Wikipedia
Asynchronous Transfer Mode — In electronic digital data transmission systems, the network protocol Asynchronous Transfer Mode (ATM) encodes data traffic into small fixed sized cells. The standards for ATM were first developed in the mid 1980s. The goal was to design a single … Wikipedia
