ITU-T Q.2111

The protocol defined in this Recommendation is called the Service Specific Connection Oriented Protocol in a Multilink and Connectionless Environment (SSCOPMCE) and provides assured data delivery between AAL connection endpoints. SSCOPMCE is a peer-to-peer protocol which provides the following functions: transfer of user data with sequence integrity; error correction by selective retransmission; flow control; connection control; error reporting to layer management; connection maintenance in the prolonged absence of data transfer; local data retrieval by the user; error detection of protocol control information; status reporting; and out-of-sequence delivery. This Recommendation enhances the specification in ITU-T Q.2110 to allow the SSCOPMCE mechanism to be deployed not only on a single ATM connection but also: on multiple ATM connections between the same endpoints; or on a connectionless network. When deployed on a single ATM connection, the protocol defined in this Recommendation is interoperable with the protocol specified in ITU-T Recommendation Q.2110. This Recommendation describes the necessary elements for layer to layer communication, the elements for peer-to-peer communication, a detailed protocol specification, and examples of assured data operation.