Stephen O. Andersen Stephen O. Andersen Stephen Oliver Andersen (born 17 January 1948) is the American Director of Research at the Institute for Governance and Sustainable Development (IGSD) and is also Senior Expert Member of the Montreal Protocol Technology and Economic Assessment Panel (TEAP) and former TEAP Co-Chair (1989 - 2012). He is considered one of the founders and leading figures in the success of the Montreal Protocol on Substances that Deplete the Stratospheric Ozone Layer. Andersen was born in Logan, Utah, United States, the child of a professor of horticulture and a botanist. He studied business administration for two years at Utah
Subnetwork Access Protocol necessary to determine which protocol is to be invoked to process a service data unit delivered by the lower layer. The most common reference to SAP, including a Source Service Access Point (SSAP) and a Destination Service Access Point (DSAP) refers to the boundary between the Data Link Layer and the Network Layer. It is common to think of SAP only in terms of its use at Layer 2, specifically in its Logical Link Control (LLC) sub-layer as defined in the IEEE 802.2 standards. Link Service Access Point (LSAP) includes both Destination Service Access Point (DSAP) and Source Service Access