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Honeywell International Inc. KTR2280A Manuale Utente

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SYSTEM INSTALLATION MANUAL
KTR 2280A
Page 3-4 
15 May 2017
© Honeywell International Inc. Do not copy without express permission of Honeywell.
optimize the CSMA protocol is included in the VDL Mode 2 channel access protocol 
specification. 
As in Mode A, the Mode 2 data link channel selection is controlled by the CMF through the same
 
high-speed ARINC 429 interface used to exchange downlink and uplink AOA or ATN
 
messages. The CMF also dynamically controls the switching between Mode A and Mode 2
 
operation subject to available coverage. Since the VDL Mode 2 data rate and modulation
 
scheme differ from those used in Mode A, separate VHF frequencies and ground-based VHF
 
equipment must be used to give POA and AOA/ATN service coverage. As a result, the
 
availability of high-speed AOA service depends on the availability of ground stations.