ATM virtual connection multiplexing and LLC encapsulation

ATM virtual connection (VC) multiplexing and logical link control (LLC) encapsulation are supported on the Channelized OC3/STM1 (Multi-Rate) Circuit Emulation MIC with SFP. ATM virtual connection multiplexing and LLC are the two methods for identifying the protocol carried in ATM Adaptation Layer 5 (AAL5) frames. The methods are defined in RFC 2684, Multiprotocol Encapsulation over ATM Adaptation Layer 5. In the ATM virtual connection multiplexing method, each ATM virtual connection carries protocol data units (PDUs) of exactly one protocol type. When multiple protocols need to be transported, there is a separate virtual connection for each protocol. The LLC encapsulation method enables multiplexing of multiple protocols over a single ATM virtual connection. The protocol type of each PDU is identified by a prefixed IEEE 802.2 LLC header.