ISO 18440:2016 defines a protocol for transfer of SLE PDUs between an SLE user and an SLE provider system in terms of:
a) the procedures used to establish and release associations;
b) the messages exchanged on an established association;
c) the procedures used to monitor the status of data communication connections; and
d) the methods used to ensure that data are converted between different formats and representations on different platforms.
It does not specify:
a) individual designs, implementations, or products;
b) the configuration of the data communications infrastructure, including configuration of the TCP and IP protocols;
c) the means by which addresses (IP addresses and TCP port numbers) are agreed, assigned and communicated.