CCITT recommendation X.25 as part of the ISO reference model of open systems interconnection
Tom Jacobsen, Peder Thisted · ACM SIGCOMM Computer Communication Review · 1980
The CCITT Recommendation X.25 is discussed in view of the ISO Reference Model of Open Systems Interconnection. It is stated, that X.25 may serve as an access method of layer 3, 4 as well as 5, depending of the actual architecture. The flow-control principles of X.25 are discussed and a clarification is recommended.