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.