Network Services in Systems Network Architecture

This paper discusses the services provided by a systems network architecture (SNA) network and design aspects related to these services. Both the basic transmission services and higher level network services are discussed. The first section describes the structure of SNA. The second section describes SNA´s transmission services and sketches in the other aspects of SNA´s structure. The next section describes services provided to users and managers of the network and the distribution of these services throughout the various nodes of the network. A concluding section discusses several potential extensions.