*
Sets downlink displays to their power-up configuration
*
Clears EICAS COMM alerts
*
Clears REVIEW messages
*
Clears MANAGER messages.
The FDCF does an automatic data link system reset 10 minutes after last engine shutdown and first passenger door open.
The data link system reset causes the DATA LINK SYSTEM -RESET status message.
The RETURN and EXIT buttons show on the sub-menu.
EFFECTIVITY BEJ ALL 23-27-00
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DCMS -FDCF SYSTEM INFORMATION AND MASTER SUB-MENUS
EFFECTIVITY BEJ ALL 23-27-00
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DCMS -DCMF FUNCTIONAL DESCRIPTION
General
The DCMF manages the internal and external communication of data. It supplies the many communication protocols and it routes data that AIMS needs to process data messages. Communication protocols are the rules and standards that the DCMF use for data communications.
The primary sub-functions of the DCMF are:
*
ACARS datalink
*
OLAN interface
*
Print driver.
Other sub-functions of the DCMF are:
*
Communications program interface (CPI)
*
Initialization
*
BITE
*
Redundancy management.
ACARS Datalink Sub-function
The aircraft communications and reporting system (ACARS) permits communication of data between airplane systems and ground systems. The ACARS has airborne subsystems and ground station networks. The ground network is made up of subscriber airlines, aviation authorities, and other users.
The DCMF supplies the airplane part of ACARS. The ACARS sub-function controls air/ground file transfers and onboard message routing. The message routing process supplies uplink message routing to onboard systems. It downlinks message routing to the ACARS ground service providers (GSP) through VHF or SATCOM. The ACARS datalink sub-function uses information within each uplink to send the message to the applicable system. The ACARS datalink sub-function also routes downlinks to the path set by the flight deck crew and airplane systems.
The flight crew sets the datalink path through the MANAGER menu of the AIMS flight deck communications function (FDCF). The path preferences are:
*
VHF
*
SATCOM
*
Auto.
The power-up default selection is auto. When the auto path is set, the ACARS sub-function uses a preference table for internal downlink routing to select a communications transceiver.
OLAN Interface Sub-function
The OLAN interface sub-function supplies the communications protocols that permit AIMS functions to send data to and receive data from member systems on the avionics local area network (AVLAN). AVLAN systems include the:
* Left and right AIMS cabinets
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DCMS -DCMF FUNCTIONAL DESCRIPTION
*
Maintenance access terminal (MAT)
*
Brouter.
These AIMS functions use the DCMF to exchange data through the AVLAN:
*
Central maintenance computing function (CMCF)
*
Maintenance terminal function (MTF).
The DCMF has redundancy management that sends data to the CMCFs in both AIMS cabinets. The CMCF also gives data load access and control to install LRU/LRM software for DCMF normal operation.
MTF provides communications between CMCF or ACMF and the AVLAN systems.
The BITE for AVLAN systems also uses the DCMF to report faults to the CMCF.
Print Driver Sub-function
The print driver sub-function transfers AIMS data to the flight compartment printer. The print driver sub-function sends data to and receives data from AIMS functions to:
*
Spool a print job
*
Send data to the flight compartment printer
*
Send printer and job status and fault data back to the AIMS function.
EFFECTIVITY
BEJ ALL
Communications Program Interface (CPI) Sub-function
The communications program interface sub-function of the DCMF supplies a common interface for data communications between other AIMS functions and these DCMF sub-functions:
*
ACARS datalink
*
OLAN interface
*
Printer driver.
The CPI supplies a common protocol across the AIMS backplane bus for data transfer.
Initialization Sub-function
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