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Flight deck printer
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Inflight entertainment system
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left, center, and right radio tuning panels (RTP)
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Center and right VHF communication transceivers (VHF).
Satellite Data Unit
The SDU sends ground service provider (GSP) data to the DCMF on a high speed ARINC 429 bus.
The SDU data goes to IOM (M003) and IOM (M004) in the left AIMS cabinet, and IOM (M008) and IOM (M009) in the right AIMS cabinet.
Flight Compartment Printer
The flight compartment printer sends status and error data to the DCMF on a high speed ARINC 429 bus.
Printer data goes to IOM (M009) in both AIMS cabinets.
Inflight Entertainment System
The inflight entertainment system sends data to the DCMF on a high speed ARINC 429 bus. The DCMF sends this data to the GSP. The data is downlink data.
Inflight entertainment system data goes to IOM (M009) in both AIMS cabinets.
Radio Tuning Panels
The RTPs send tuning data and broadcast status data to the DCMF and the flight deck communication (FDCF) on low speed ARINC 429 buses.
Left RTP data goes to IOM (M004) in the left AIMS cabinet and IOM (M003) in the right AIMS cabinet. Center RTP data goes to IOM (M008) in both cabinets. Right RTP data goes to IOM (MOO3) in the left AIMS cabinet and IOM (M004) in the right AIMS cabinet.
VHF Communication Transceivers
The DCMF receives and sends GSP data to the VHF transceivers on ARINC 618 data buses.
The center VHF exchanges data with the ACARS modem in the left CPM/Comm. The right VHF exchanges data with the ACARS modem in the right CPM/Comm. The DCMF does not interface with the left VHF transceiver.
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DCMS -ARINC 429 INPUTS AND ARINC 618 INTERFACES
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DCMS -ARINC 429 INTERFACES -OUTPUTS
General
The data communication management function (DCMF) uses the DCMF bus and the general purpose bus 2 to send data.
Each bus takes data from one of two IOMs in each cabinet. Each bus uses a source select relay to get data from one of two IOMs in each cabinet if necessary.
DCMF Bus
The source select relay for the DCMF bus energizes when the DCMF sends a signal. This causes data to come from IOM (M009). When the DCMF causes the source select relay to relax, data comes from IOM (M003).
The DCMF bus is a high speed ARINC 429 bus. It sends data from the left and right AIMS cabinets to the:
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Satellite data unit (SDU)
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Inflight entertainment system
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Flight compartment printer.
The DCMF sends downlink data through the SDU to the ground service provider (GSP).
The DCMF controls the print requests it receives from other AIMS functions. It sends print controls and data to the printer.
General Purpose Bus 2
Fault detection and switch logic in IOM (M003) energizes the source select relay. This causes the source select relay to use general purpose bus 2 data from IOM (M003). When the fault detection and switch logic causes the source select relay to relax, data comes from IOM (M004).
The general purpose bus 2 is a low speed ARINC 429 bus. It sends tuning data and broadcast status data to the RTPs.
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777 AIRCRAFT MAINTENANCE MANUAL
DCMS -ARINC 429 INTERFACES -OUTPUTS
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DCMS -INTERCABINET ARINC 629 INTERFACES
Intercabinet Interface
The DCMFs and FDCF exchange data across AIMS intercabinet ARINC 629 buses. The DCMFs use buses 3 and 4. The FDCFs use buses 1 and 2.
The DCMF data includes the:
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Inputs to each DCMF
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Status and control information from each DCMF.
The DCMFs use this data to keep synchronized and to monitor their operation.
The FDCF data includes:
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FDCF-related display information
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FDCF-related central maintenance information
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FDCF-related DCMF information
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FDCF-redundancy information.
The FDCFs use this data to keep synchronized and to monitor their operation.
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777 AIRCRAFT MAINTENANCE MANUAL
DCMS -INTERCABINET ARINC 629 INTERFACES
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