DCMS -OLAN AND DISCRETE INTERFACES
OLAN Interfaces
The avionics local area network (AVLAN) is part of the onboard local area network (OLAN) fiber distributed data interface (FDDI). The AVLAN uses a primary (PRI) network loop with a secondary (SEC) network loop as an alternative. The avionics LAN uses the ARINC 636 standard. The DCMF supplies the communications protocols that permit AIMS to exchange data with the:
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Maintenance access terminal (MAT)
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Brouter.
The brouter supplies the interface to the PMATs.
PRI BS1 is a 15v dc power discrete. It causes the bypass switch unit (BSU) to connect the left or right AIMS cabinet to the primary loop of the avionics LAN.
SEC BS1 is also a 15v dc power discrete. It causes the BSU to connect the left or right AIMS cabinet to the secondary loop of the avionics LAN.
Discrete Interfaces
The DCMF uses the data key line to key the VHF communication transceiver. When the DCMF keys the transceiver, the DCMF sends the downlink message to the VHF communication transceiver.
The DCMF uses the voice/data select to set the VHF communication transceiver to the data signal mode. At power-up, the DCMF sets the center VHF communication transceiver to the data signal mode. If the center VHF communication transceiver fails the DCMF selects satcom for data transmissions. If satcom fails, the DCMF selects the right VHF communication transceiver for data transmissions.
The left VHF communication transceiver is voice only.
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777 AIRCRAFT MAINTENANCE MANUAL
DCMS -OLAN AND DISCRETE INTERFACES
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DCMS -FDCF DISPLAY OVERVIEW
General
The FDCF displays show on a multifunction display (MFD). The FDCF receives messages from the airline’s ground station and sends them to the PDS to show on the MFD. The flight crew can also send messages to the airline’s ground station.
To show the FDCF main menu bar, select COMM on the display select panel (DSP).
These are the six menu selections that show on the FDCF main menu bar:
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ATC
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FLIGHT INFORMATION
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COMPANY
*
REVIEW
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MANAGER
*
NEW MESSAGES.
Buttons show at the bottom of the display to give the flight crew control.
ATC
The air traffic control (ATC) menu shows all of the displays the flight crew uses to communicate with the ATC system.
Flight Information
The FLIGHT INFORMATION selection is not available now. There is no response when the crew puts the CCD cursor in this menu selection.
COMPANY
The COMPANY menu shows all customer configured downlink messages.
REVIEW
The flight crew uses the REVIEW menu to look at uplink or downlink messages. Uplink messages show here after the crew accepts or rejects them. Messages that do not require an accept or reject also show here.
MANAGER
The MANAGER menu shows status information and supplies controls for flight deck communication external support devices. In the MANAGER menu, pages show for:
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The radios
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The flight compartment printer
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Message configuration
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Datalink configuration.
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DCMS -FDCF DISPLAY OVERVIEW
NEW MESSAGES
The NEW MESSAGES menu shows the new messages that require flight crew review. The new messages usually come from the airline ground station. They may also be messages that the flight crew enters.
Buttons
The flight crew uses the buttons to control the flight deck communication function (FDCF) displays. Each FDCF display causes different buttons to show.
The ACCEPT, REJECT, and CANCEL buttons on the FDCF display do the same functions as the ACCEPT, REJECT, and CANCEL switches on the P7 glareshield panel.
These buttons can show on the FDCF displays:
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ACCEPT
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SEND
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LOAD FMC
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PRINT
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PRINT LIST
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RESET
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STANDBY
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RETURN
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APPEND
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REJECT REASONS
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REJECT
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CANCEL
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EXIT
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EXIT MENU.
The ACCEPT button shows when a received message requires an accept or reject response and all pages of the message have been displayed.
The SEND button shows when all required data for the message has been entered and all pages have been displayed.
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