High Quality Content by WIKIPEDIA articles! A Service Access Point
(SAP) is an identifying label for network endpoints used in Open
Systems Interconnection (OSI) networking. When using the OSI
Network Layer (CONS or CLNS), the base for constructing an address
for a network element is an NSAP address, similar in concept to an
IP address. OSI Application Layer protocols as well as Asynchronous
Transfer Mode (ATM) can use Transport (TSAP), Session (SSAP) or
Presentation (PSAP) Service Access Points to specify a destination
address for a connection. These SAPs consist of NSAP addresses
combined with optional transport, session and presentation
selectors, which can differentiate at any of the three layers
between multiple services at that layer provided by a network
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