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NSAP, PSAP, and TSAP Port Numbers

You can use DXmanager to configure NSAP, PSAP, and TSAP ports. However, we recommend that you do not use these options.

These options are available to ensure interoperability with third-party X.500 directories. They are not required for LDAP.

This is because the X.500 standard was built on top of the OSI model, whereas LDAP was layered directly over TCP/IP. TCP/IP effectively maps to the Network and Transport layers, and the concept of ports negates the need for NSAPs and PSAPs.