ISO 22664:2013

ISO 22664:2013 specifies the telecommand (TC) space data link protocol. This protocol is a data link layer protocol (as defined in ISO/IEC 7498-1) intended for use over ground-to-space or space-to-space communications links by space missions.
ISO 22664:2013 defines the TC space data link protocol in terms of

the services provided to the users of this protocol,
the protocol data units employed by the protocol, and
the procedures performed by the protocol.

It does not specify

individual implementations or products,
the implementation of service interfaces within real systems,
the methods or technologies required to perform the procedures, or
the management activities required to configure and control the protocol.