*medium/long-term drift of the physical link characteristics
*significant part to part variations of such characteristics.
Additional requirements have to be metLast but not least, that is monitoring function functionality has to be substantially non-intrusive with respect to:*<span id="REQ1">REQ1</span>: the software applications running in the Linux realm*<span id="REQ2">REQ2</span>: the user functions implemented in PL*<span id="REQ3">REQ3</span>: transmission/reception of user data through the link*<span id="REQ3">REQ4</span>: the overall system functionality.
==Link monitoring==
