VI Scan the text with your partner to discuss the following questions.

1What for did ICAO develop standards and recommend practices?

2 What has served the industry well as a teletype-based, message-switching network for many years?

3 When did the ATN SARPs development begin?

4 What has had unprecedented success in the past 15 years?

5What may be necessary for ICAO to make some accommodation to TCP/IP lest the cost of implementing the ATN be prohibitive?

6 Why did ACARS become essential to airline operations, the limitations of the initial VHF link become intolerable?

7 What was the basis for initial FANS implementations in the South Pacific?

8 What was an improvement over HF voice services?

9 What were the advantages of data link over voice communications?

10 What did HFDLprovide?

11 Where did VHF Digital Link (VDL) Mode 2 providea higher-speed subnet

work?

12Where is the ACARS avionics architecture centered?

13Where do all air-ground radios connect to?

14 Where is the CMU connected?

15 Where does the MU or CMU actas the ACARS router?

16Why MU does not perform a message-switching function?

17 Where were the original OOOI messages formatted and sent to the MU?

18 What sends and receives routine ACARS messages in the modern transport

aircraft?

19 What is the MCDU, along with the printer?

20 What will also interact with the crew for FANS messages?

21 What are downlinks automatically generated by various systems on the airplane

today?

22 What does the MU identify?

23 What does the latest avionics for each of the four sub- networks accept?

24 What will the subnetwork avionics then transform?

25 When was the original VHF subnetwork pioneered?

26 What does the VHF subnetwork use?

27 What does each signaling interval represent?

28 What is CSMA?

29 What is the VHF ACARS subnetwork?