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HONEYWELL Aerospace Electronic Systems Page 18
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3 FUNCTIONAL OVERVIEW
The Mark III CMU is designed to provide complete datalink capability, providing interfaces and support to
today’s installed equipment. In addition, Honeywell as well as the industry recognizes that Datalink features
will be expanded over time, and is in fact the principle behind the current ARINC 758 characteristic. A
Characteristic that was developed to define current operation (referred to as Level O.1A), and allow
expansion over time to support new requirements and needs. The Mark III CMU was specifically designed to
support such future growth. Growth Functionality describes potential new capabilities for post-baseline
software releases. Many of the capabilities described in both the Baseline Functionality and Growth
Functionality sections are configurable via the AMI or the HGI.
The Mark III CMU supports an ARINC 739 MCDU, an ARINC 739 MIDU, and a CDU for displaying ACARS
information. For the purpose of simplifying the text of this section, 'datalink display' will be used generically
to mean MCDU, MIDU, or CDU.
3.1 Baseline Functionality
The baseline Mark III CMU provides functionality defined as level 0.1A in ARINC 758.
For Reference, the level of functionality as defined in the ARINC 758 Characteristic is shown below. This
level of functionality is defined, as the CMU is recognized within the industry as evolving over time in order to
meet future CNS/ATM requirements.
A758 level Service Function
0 ARINC 724B ACARS equivalent
ARINC 618: ACARS
ARINC 716: VHF
ARINC 750: VHF Mode 0
ARINC 741: SATCOM
0.1 + VDR Mode A using ARINC 429 I/F
ARINC 750: Mode A
ARINC 761: SATCOM
ARINC 753: HF
0.2 AOA VDLM2
1 + ATN Services
ARINC 750: VDL Mode 2
2 + High Speed Services
Not specified at this time