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Our paper focuses on the Interface Message Processor (IMP), an important device in the history of ARPANET. Designed as the interface between ARPANET nodes and the common carrier telephone system, t...

The rapid growth in local area networks (LANs) over the past few years has generated interest in the interconnection of LANs. The need of interconnecting LANs arises because it is advantageous to allow users in a much wider geographic span to communicate and to share resources. Furthermore, when a communication system with a large number of users in it, it is expected that the performance of the system will be better than the case that all these large number of users are directly connected if the users are firstly grouped into clusters which are interconnected. This paper describes a packet switching architecture which interconnects sections of local area networks operated in ALOHA mode. The properties that this packet switching node possesses are similar to those of an interface message processor (IMP), also known as a node, in a computer communication network. This node has the functionality of selectively connecting Users in different sections of slotted ALOHA channels. Detailed throughput and...

In this paper, we discuss flow control in a resourcesharing computer network. The resources consist of a set of inhomogeneous computers called hosts that are geographically distributed and are interconnected by a store-and-forward communications subnet. In the communication process, messages pass between hosts via the subnet. A protocol is used to control the flow of messages in such a way as to efficiently utilize the subnet and the host resources. In this paper, we examine in some detail the nature of the flow control required in the subnet and its relation to the host flow control and subnet performance.