Download or read book Manual on Detailed Technical Specifications for the Aeronautical Telecommunication Network (ATN) Using ISO/OSI Standards and Protocols written by International Civil Aviation Organization and published by . This book was released on 2010 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part 1 - Air-ground applications -- pt. 2 - Ground-ground applications - Air Traffic Services Message handling (ATSMHS) -- pt. 3 - Upper Layer Communications Service (ULCS) and Internet Communications Service (ICS) -- pt. 4 - Directory services, security and systems management.