 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 to send only one packets belonging to a single high-level protocol on any given ATM virtual circuit, and multiple virtual circuits may need to be set up.