A Service Access Point or SAP is an identifying label for network endpoints used in
OSI networking. When using the OSI networking 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
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 element.
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