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The microprocessor receives the SELCAL tones and compares them with the SELCAL code of the airplane. If the tones are the same as the airplanes code, the microprocessor sends a command to the output driver.
The output driver then energizes the output relay. When the relay energizes, the audio management unit receives a ground.
Call Reset
The audio management unit sends a ground to the reset buffer in the SELCAL decoder. When the reset buffer gets the ground it tells the microprocessor to reset the command to the output driver. Then all the indications go off.
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777 AIRCRAFT MAINTENANCE MANUAL

SELCAL -FUNCTIONAL DESCRIPTION

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DATA COMMUNICATION MANAGEMENT SYSTEM -INTRODUCTION

General
The data communications management system (DCMS) supplies a common interface for AIMS functions and other systems that need to exchange data. The DCMS has these functions:
*
Data communications management function (DCMF)

*
Flight deck communication function (FDCF).

Abbreviations and Acronyms
*
ACARS -aircraft communications addressing and reporting system

*
ACMF -airplane condition monitoring function

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AIMS -airplane information management system

*
AMI -airline modifiable information

*
APL -airplane

*
ARINC -Aeronautical Radio, Inc.

*
ATC -air traffic control

*
ATIS -automatic terminal information service

*
auto -automatic

*
AVLAN -avionics local area network

*
BITE -built-in test equipment

*
BSU -bypass switch unit

*
CCD -cursor control device

*
CDU -control display unit

*
CMCF -central maintenance computing function

*
COMM -communication

*
CPI -communication program interface

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CPM -core processor module

*
DCMF -data communication management function

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DCMS -data communication management system

*
DFDAF -digital flight data acquisition function

*
DLGF -data load gateway function

*
DSP -display select panel

*
EICAS -engine indication and crew alerting system

*
ETA -estimated time of arrival

*
FDCF -flight deck communication function

*
FDDI -fiber digital data interface

*
FMCF -flight management computing function

*
GBST -ground base software tool

*
GSP -ground service provider

*
ICAO -International Civil Aviation Organization

*
info -information

*
I/O -input/output

*
IOM -input/output module

*
ISO -International Standards Organization

*
LAN -local area network

*
LRU -line replaceable unit

*
MAT -maintenance access terminal

*
MCP -mode control panel

*
MFD -multi-function display

*
MTF -maintenance terminal function

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NOTAMS -notice to airmen

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OLAN -onboard local area network

*
OPC -operational program configuration

*
OPS -operational program software

*
OSI -open systems interconnection

*
PDF -primary display function

*
PDS -primary display system

*
PIIC -passenger inflight information computer

*
PMAT -portable maintenance access terminal

*
pri -primary

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DATA COMMUNICATION MANAGEMENT SYSTEM -INTRODUCTION

*
PROC -processor

*
RTP -radio tuning panel

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SATCOM -satellite communication

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sec -secondary

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sw -switch

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SDU -satellite data unit

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VHF -very high frequency

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xcvr -transceiver

*
xpdr -transponder

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DATA COMMUNICATION MANAGEMENT SYSTEM -INTRODUCTION

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DCMS -GENERAL DESCRIPTION

General
The data communication management system (DCMS) manages analog and digital data in many different formats. It divides the work into these two functions:
　
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