Link Invariant Line Programs in Communication Systems

摘要

Starting with the term 'communications system' a general introduction to the field of communications operating systems is given. By two examples, the operational program of the Interface Message Processors (IMPs) and TIPS, (Terminal IMPS) in the ARPA computer network and the operating system SOHO, it is shown in detail how communications operating systems can be constructed. The line programs are the object of particular consideration. The terms 'simple', 'copied', and 'link invariant' line programs are defined, and the advantages and disadvantages of these types of line programs are discussed. The implementation of link invariant line programs in the operating system SOHO is described. Their memory space and computing time requirements are evaluated. The effect of these requirements on the overall system performance is investigated. The investigation shows that link invariant line programs are preferable to copied line programs in most cases.