HP 800 ACSE/Presentation and ROSE Interface Programmer's Guide - Page 105

Glossary ODA Office Document Architecture; a developing standard that enables text, graphics and facsimile, in different document formats, to be moved over a multivendor network. OSI Open Systems Interconnection; the name used to describe a set of data communications standards which have been agreed upon at an international level by national standards bodies. OSI Reference Model a modular, seven-layer construct that specifies how data will travel among systems of a multivendor network, as well as within a single system. Physical Layer Layer 1 of the OSI model; enables the sending and receiving of bits between nodes on a network. Presentation Address An address made up of a P-selector, Sselector and T-selector (presentation, session, and transport selectors) and one or more NSAPs. Optionally, it can include the application entity (AE) title which is a unique name identifying an OSI service such as FTAM. Presentation Layer Layer 6 of the OSI model; where data are put into usable form. proprietary networking networking that uses the products and protocols of a single vendor. protocol a formalized set of rules by which computers communicate. ROSE Remote Operations Service Element. The OSI application service element which manages request/reply interactions. SAP Service Access Point. A SAP is a pipe between two OSI layers such that an entity at layer n + 1 can obtain a set of services from layer n. Selector a sequence of octets (bytes) used to identify a SAP. Session Layer Layer 5 of the OSI model; permits the setup of a communications path along a network and manages the coordination between processes. SNA Systems Network Architecture; IBM's proprietary networking formats, protocols and procedures that are also a de facto networking standard. Glossary 105