777 AIRCRAFT MAINTENANCE MANUAL
AIMS -RS422 BUS INTERFACES
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AIMS -WEATHER RADAR BUSES ARINC 453 INTERFACES
ARINC 453 Buses
The left and right weather radar receiver-transmitters (WXR RT) send weather data to both AIMS cabinets on high speed ARINC 453 buses. Each WXR RT transmits the data over two ARINC 453 buses. Each AIMS cabinet also sends the ARINC 453 weather radar bus inputs to the other AIMS cabinet.
For the Captain’s display, the primary selection is the Left WXR Transceiver’s Data Bus 1 and the secondary selection is the Right WXR Transceiver’s Data Bus 1. Similarly for the F/O’s display, the primary selection is the Left WXR Transceiver’s Data Bus 2 and the secondary selection is the Right WXR Transceiver’s Data Bus 2.
Two load resistors terminate the ARINC 453 weather radar bus inputs at the rear connector in each AIMS cabinet.
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AIMS -WEATHER RADAR BUSES ARINC 453 INTERFACES
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AIMS -DATALINK ARINC 618 INTERFACES
ARINC 618
Each AIMS cabinet receives uplink ARINC 618 signals from its VHF communication transceiver.
Each AIMS cabinet transmits downlink ARINC 618 signals to its VHF communication transceiver.
The CPM/Comm in each AIMS cabinet has a modem interface to receive and transmit the signals.
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777 AIRCRAFT MAINTENANCE MANUAL
AIMS -DATALINK ARINC 618 INTERFACES
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AIMS -AVIONICS LOCAL AREA NETWORK ARINC 636 INTERFACES
Avionics Local Area Network
The CPM/Comm in both AIMS cabinets has the fiber optics interface that supplies the connections to an avionics local area network (AVLAN). The AVLAN supplies a high speed communication path to the:
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Maintenance access terminal (MAT)
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Portable maintenance access terminal (PMAT)
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Four portable maintenance access terminal (PMAT) receptacles.
The AVLAN connects the AIMS cabinets to the MAT and a brouter through a bypass switch unit. The brouter supplies the connection to the PMAT and PMAT receptacles with a ten base T bus.
The DCMF in the CPM/Comm has the communication protocols that permit the AIMS functions to communicate with the AVLAN.
The CMCF and ACMF send their data to the DCMF to be formatted with the correct data format. The DCMF then transmits this data on the AVLAN.
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AIMS -AVIONICS LOCAL AREA NETWORK ARINC 636 INTERFACES
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AIMS -DISPLAY UNITS VIDEO BUSES INTERFACES
Display Units Video Buses
The two core processor module/graphics generators (CPM/GG) in both AIMS cabinets transmit video signals to the six display units. Each CPM/GG transmits on a dedicated display units video bus.
The display units video buses are coaxial cables that transfer high speed digitized compressed video signals. Each of the video buses is split by a coaxial coupler into six signals. The six signal then go to the six display units.
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AIMS -DISPLAY UNITS VIDEO BUSES INTERFACES
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AIMS -ANALOG DISCRETE INPUTS INTERFACES
General
There are two ways analog discrete inputs go to the input/ output modules:
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The analog discrete input goes to two IOMs in the one AIMS cabinet
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The analog discrete input goes to two IOMs in both AIMS cabinets.
Analog Discrete Inputs
The AIMS cabinets receive these analog discretes:
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Autothrottle disconnect
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Autothrottle disconnect reset
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Takeoff go around
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Master caution warning light reset
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Key event from the VHF radios
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Key event from the HF radios
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QAR tape low and status
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Program pins
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Air ground status from ELMS
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