An interface provided by a Technical System. A System Port Connector asserts that a connection exists between two System Ports.
SESAR European ATM Architecture (EATMA) Guidance Material v7 (D138, Ed. 00.07.00, 2016)
System ports are linked to Systems that implement them. One System Port can be attached to many Systems and one System can have many System Ports.
Lexicon Release 2015.1