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1 INTRODUCTION
1.1 Mark III CMU Overview
Honeywell provides a family of Datalink products, ranging from the AFIS product for the business Jet market, to our Mark II and Mark III CMUs for the Air transport and Military market. The Mark III Communications Management Unit (CMU), discussed in this document, is Honeywell’s
The Mark III CMU is the next generation in CMU products. It offers over 100 Mbytes of memory (64 MB of volatile memory and 48 MB of
The Mark III CMU is a full ARINC 758 complaint unit, and is supported by an Aircraft Personality Module (APM). In addition, the Mark III CMU contains additional I/O capability above and beyond that called out for in the ARINC 758 characteristic. This includes a UHF Modem added to the unit for potential future use of UHF as a datalink subnetwork. It includes customized RS 422 ports to support
The baseline Mark III CMU provides the capability to communicate over HFDL, SATCOM, and VHF (Mode 0/A). By designing the Mark III CMU with the necessary hardware to support future datalink requirements, functionality like VDL Mode 2 and the Aeronautical Telecommunications Network (ATN) are added with just a software upgrade. Due to the size of the memory and processor capability contained within the unit, the Mark III CMU provides the lowest risk to an airline for introduction of such new technology, as it becomes required for future CNS/ATM operation.
The Mark III CMU utilizes a
A user has the capability to customize their Airline Operational Communications (AOC) application through the use of the Airline Modifiable Information (AMI) database. All of the I/O parameters specified in the FIDB are available to the user as part of the AMI definition. By having the I/O parameters isolated to the FIDB, a single AMI can be subsequently generated using logical I/O parameters for all aircraft types within a fleet. The AMI allows the user to:
∙Design the screen layouts
1The integrated Gatelink approach would provide on the order of a 1 to 11 Mbit/second network over approximately 1,000 feet utilizing the unlicensed 2.4 Ghz spread spectrum frequency. The Gatelink upgrade would also require a TWLU and antennas to be installed on the aircraft, in addtion to a hardware upgrade to the Mark III CMU.
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