Existing GM for AMHS Over IPS

1

COMMUNICATIONS PANEL (CP)

First Meeting

of the

COMMUNICATIONS WORKING GROUP

Montréal, Canada, September 28 – October 2, 2015

Annex 10 Vol III Part 1 Proposed Work - CMU for Domestic ATS Services

(Presented by the Federal Aviation Administration)

1.INTRODUCTION

1.1This paper identifies work to be done in Annex 10 Volume III regarding the avionics Communications Management Unit (CMU) as used for Air Traffic Services communication in domestic airspace.

2.Discussion

2.1The current AMS(R)S SATCOM systems being defined for Air Traffic Services provide an Internet Protocol (IP) service air-to-ground. Current CMUs provide only an 11kbps channel over an ARINC 429 bus to the SATCOM systems (as per ARINC 741, 761 or 781.) The avionics CMUs need to be designed to provide a high-speed interface that carries Air Traffic Services data in IP packets to these SATCOM systems to take advantage of the increased bandwidth.

2.2A systems view of the overall network should also consider modifying the timers within the CMU to match operational requirements in domestic airspace, using the IP-based SATCOM systems.

2.3Additionally, the CMU as the airborne router will likely host security features required at the network layer.

2.4Definition of airborne IP networks has been created in the suite of ARINC 664 standards, which could be used a baseline for this work. Selection of IP protocols allows use of off-the-shelf features that can be selected for use in the ATN/IPS.

2.5Finally, the overall criticality of the CMU software needs to be identified in terms of the flight separations standards, and the appropriate certification level should be assigned to the CMU for use as the airborne router for Air Traffic Services communications in domestic airspace.

3.ACTION BY THE MEETING

3.1The CWG is invited to consider undertaking work on Annex 10 Volume III to include definition of the avionics CMU to provide a high-speed interface that carries Air Traffic Services data in IP packets to the IP-based SATCOM systems to take advantage of the increased bandwidth, improve timing for domestic airspace operations, facilitate security provisions, and simplify the end-to-end network design.