-ATSU validity
 -Datalink status
 -Voice busy
 -VHF3 voice

 (2)
 Interface with the MCDUs The MCDUs provide the air/ground communication routing function with the following services:

 -Possible connection with the MCDU1, MCDU2 or MCDU3 and simultaneously with up to two MCDUs.
 -Human-Machine Interface provided with the MCDU system pages and scratchpad message displays.
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 B. Interface with the Communications Systems

 (1)
 Interface with the VDR3 The VDR3 provides the air/ground communication routing function with the following services:

 -VDR mode control,
 -ARINC 618 data exchange,
 -VHF link management,
 -Error indication,
 -Status reporting.

 (2)
 Interface with the RMPs The RMPs provide the air/ground communication routing function with the following services:

 -Remote port select to indicate a request for switching the system which controls the VDR3,
 -port select information to indicate which system is controlling the VDR3.

 (3)
 Interface with the Satcom system (if installed) The ATSU uses the services provided by the SDU1 to communicate with the ground in data mode. The Satcom manages by itself its frequency tuning and the connection with the ground network. The ATSU does not control the mode of operation of the Satcom. The Satcom provides the air/ground communication routing function with the following services:

 -ARINC 618 downlink and uplink message exchanges,
 -SDU1 status transmission to the ATSU,
 -ATSU status transmission to the SDU1 (primary source/destination, failure...).

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 (4) Interface with the HFDR system (if installed) The ATSU uses the services provided by the HFDR1 to communicate with the ground in data mode. The HFDR1 provides the air/ground communication routing function with the following services:
 -ARINC 618 downlink and uplink message exchanges,
 -HFDR1 status transmission to the ATSU,
 -ATSU status transmission to the HFDR1 (primary source/destination, failure...).
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 C. Interface with the Electronic Instrument System
 (1) Interface with the Clock The Clock provides the air/ground communication routing function with the UTC date and time.
 D. Interface with the Flight Warning System The FWCs provide the air/ground communication routing function with:
 -alert generation service,
 -warning generation service.
 NOTE : The inhibition of the warnings depending on the flight phase is
____
 performed by the FWCs.

 E. Interface with the Landing Gear System The LGCIU provides the air/ground communication routing function with the Flight/Ground information .
 F. Interface with the On board Maintenance Systems
 (1) Interface with the CFDIU The CFDIU provides the air/ground communication routing function with the following services:
 (a)
 Acquisition of ARINC 429 parameters

 -Aircraft registration number
 -Flight number
 -Destination airport
 -SDU installed/not installed
 -VDR3 installed/not installed
 -CFDIU activity label
 -Date
 -ACMS DMU installed/not installed.

 (b)
 Exchange of ARINC 619 messages

 (c)
 Transmission by the system of status information

 -System validity
 -Datalink availability (VHF,SATCOM)
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 (2)
 Interface with the printer The printer provides the air/ground communication routing function with the transmission of printouts service:

 -Audit block reports,
 -MCDU page print,
 -Statistics report print,
 -Label C1 (free text) print.

 (3)
 Interface with the A/C Condition Monitoring System Data Management Unit (ACMS DMU) The ACMS DMU provides the air/ground communication routing function with the following services:

 (a)
 Acquisition of ARINC 429 parameters

 -ACMS DMU activity label.

 (b)
 Exchange of ARINC 619 messages

 (c)
 Transmission by the system of status information
　
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