Honeywell Mark III manual Atn, Rri, Encryption/Authentication

support as part of the baseline the text Weather uplinks which has become standard use within the Air transport industry.

ATN

The industry has embarked on the definition of a new communications standard named the Aeronautical Telecommunications Network (ATN). The ATN offers a standardized, robust, and efficient communications mechanism that provides additional services. Honeywell has been a leading member of the international consortium, Aeronautical Communication Inc. (ACI) developing this new communications software. The ATN is the ICAO defined solution to be used world wide as the industry transitions much of today’s ATC voice communication to datalink in the years ahead.

ACI has developed both the Router Reference Implementation (RRI), which is the communications stack, and the Application Service Elements (ASEs), which are the algorithmic portion of the CNS/ATM-1 applications. ASEs have been developed for Controller Pilot Data Link Communications (CPDLC), Automatic Dependent Surveillance (ADS), Context Management (CM) and Flight Information Services (FIS). ACI developed both the RRI and the ASEs to be portable and therefore readily hostable in a number of different target environments, both in avionics and ground systems. An integrator would only have to port the RRI & ASEs to the target environment and then add the display portion of the applications along with subnetwork- specific interfaces (see Figure 9).

Applications

ASEs

RRI

Subnetworks

Figure 9 ATN

As the only CMU manufacturer involved in the actual development of the ATN software, Honeywell provides our customers with a unique capability of having engineering and technical support as this new technology is fielded in the years ahead. The Mark III CMU was specifically developed to support the addition of this new ATN software, without any hardware modifications to the unit. This will be a future upgrade option for the Mark III CMU.

Encryption/Authentication

Encryption and authentication are key issues surrounding secure data communications. Encryption involves the encoding of the broadcast bit stream using a secure encryption key. Authentication involves ensuring that only authorized users are accessing the application services. The Mark III CMU is designed to support

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