Which parts of the avionics need modification to meet the Link 2000+ requirements?
There are three main systems that need to be upgraded or provided on an aircraft in order to offer LINK2000+ Services. 1. The Human Machine interface must include the means to display received messages and to enter responses or new messages. This can be achieved by modifications to an MCDU/DCDU. A dedicated printer and keyboard can also be used. An alerting mechanism is needed to notify the aircrew of arrival of a message. Audible and/or visual alerts can be integrated with existing audible and/or visual alerting components on the flight deck. Link 2000+ does not specify how this should be implemented. 2. The CMU/ATSU need to include the software for the Services and the ATN. This software contains the applications (eg. CPDLC, CM) to encode/decode the messages; and contains the ATN end system and router protocols. It is implemented as a software upgrade to the CMU/ATSU or similar systems. The implementation choice is left to the aircraft manufacturer or avionics vendor. 3. A VHF Data R
