Performance of window flow control scheme for interconnected packet networks

When communication packet networks are interconnected, all internetwork traffic concentrates at the connecting point, and flow control is needed. X.75 provides window flow control at the connecting point (signaling terminal equipment). The authors investigate the performance of the window-flow-control scheme by simulation. They compare three ways of instituting flow-control-boundary division, and show that end-to-end within each network and between the two terminal is the best boundary division because its offers has satisfactory total delay with small buffer in the signaling terminal equipment. The concept and design of a service access procedure are presented for establishing transparent and reliable connections between the top three layer protocols of the ISO Open System Interconnection (OSI) and the corresponding bottom four layer protocols. The transport and network protocols have been selected to be the US Department of Defense standard transmission control protocol (IP), respectively. The upper layer protocols are made a part of the host processor´s software whereas the TCP/IP and the subsequent lower layer protocols are resident in a physically distinct device such as an interface unit