A Network Service Access Point (NSAP) addresses, defined in ISO/IEC 8348, are identifying labels for network endpoints used in
OSI networking.These are roughly comparable to
IP addresses used in the IP protocol; they can specify a piece of equipment connected to the
ATM network. A specific stream (analogous to a '
port' or '
socket' used with
TCP or
UDP) is specified by using a
TSAP, or Transport Service Access Point. ATM can also use a Presentation and Session AP (PSAP and SSAP respectively), but these may also be left blank; this is up to the application.
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NETWORK SERVICE ACCESS POINT. NSAP