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Mark III Communications Management Unit (CMU) |
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 The CMU Mark III is the latest Honeywell airborne communications router that supports data link service access between aircraft data link applications and their corresponding ground service providers. This includes Aeronautical Operational Communication (AOC), Controller Pilot Data Link Communication (CPDLC) and Automatic Dependent Surveillance (ADS). |
| The CMU Mark III is based on ARINC 758 and can be upgraded by software download to an Aeronautical Telecommunications Network (ATN). The CMU Mark III also functions as an ARINC 724B compatible data link router using the Aircraft Communications Addressing and Reporting System (ACARS) network. |
Access to the ground network is accomplished by the following links:
 | | Satellite communications (SATCOM) | | | Very High Frequency (VHF) | | | High Frequency (HF) | | | Ethernet | | | Ultra High Frequency (UHF) |
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