The link block is a behaviour that acts as the communication link between
each and every transmitter and receiver. Based on whether there is an active connection
between the two antennae, it will be able to send and receive messages between the two
objects. This is the base class for all the link blocks in the system.
A flag whether the accessibility is being calculated based on the antennaproperties or if it is set by an external model, such as the ground stationlink.
The override access flag, if the access is being set externally, which willdetermine if the link is accessible or not. If the access is not allowed tobe overridden, this will not be used.