Virtual Circuit Multiplexing

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Virtual Circuit Multiplexing or VC-MUX is a form of network traffic control. It is used in situations where multiplexing is preferable to switching. Multiplexing is used when there's a need to transport multiple data streams over a single data link. VC-MUX is commonly used in conjunction with PPPoE and PPPoA. Which are used in various xDSL implementations.

According to the IEEE 802 family of standards (Ethernet, WiFi, etc), in VC Multiplexing (VC-MUX), each ATM Virtual Circut (VC) carries PDUs of exactly one protocol type. When multiple protocols need to be transported, there is a separate VC for each.

Advantages:

  • VC multiplexing tends to reduce fragmentation overhead (e.g., an IPV4 datagram containing a TCP control packet with neither IP nor TCP options exactly fits into a single cell).

[edit] Also see

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