*
Radio frequency attenuator (RF ATTN)
*
Radio frequency splitter (RFS)
*
Class C high power amplifier (HPA)
*
Class A high power amplifier (HPA)
*
High power relay (HPR)
*
Three low noise amplifier/diplexers (LNA/DIPs)
*
Low gain antenna (LGA)
*
Two beam steering units (BSUs)
*
Two high gain antennas (HGAs)
EFFECTIVITY
BEJ ALL
*
Radio frequency combiner (RFC)
*
Satellite data unit (SDU).
SATCOM System Connections
The airplane SATCOM equipment connects with:
*
The control display units (CDUs). The SATCOM control and status pages on the CDU give flight crew control of the SATCOM system. These pages also give system status data.
*
The audio management unit (AMU). Microphone audio and push-to-talk discretes go to the SDU through the AMU. Receive audio goes from the SDU to the speakers and headsets through the AMU.
*
The cabin telecommunications unit (CTU). Passengers use the SATCOM system through the CTU.
AIMS Connections
The SATCOM system also connects with the airplane information management system (AIMS) for these functions:
*
Data communication management function (DCMF). The DCMF supplies data communications control for airplane air/ ground datalink over the SATCOM system.
*
Central maintenance computing function (CMCF). The CMCF gets SATCOM system fault reports and writes this data in a fault history. This shows the maintenance crew the defective component or function. The maintenance access terminal (MAT) gives access to the CMCF for loading and updating SATCOM configuration data.
*
Data conversion gateway function (DCGF). The DCGF changes inertial reference system data into ARINC 429
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Config 008 Page 5 D633W101-BEJ Sep 05/2002
SATCOM SYSTEM -GENERAL DESCRIPTION
data for high gain antenna (HGA) beam steering. The DCGF also supplies international civil aviation organization (ICAO) addresses.
High Gain Antenna System
The two high gain antenna systems receive and transmit voice and data signals. A high power relay (HPR) sends signals to only one high gain antenna system at a time. A radio frequency combiner (RFC) gets signals from each antenna system and sends them to the RFU. Each high gain antenna system has these components:
*
High gain antenna (HGA)
*
Beam steering unit (BSU)
*
Low noise amplifier/diplexer (LNA/DIP).
Low Gain Antenna System
The low gain antenna system receives and transmits data signals. This system operates only when a high gain antenna system fails or class A high power amplifier fails. The low gain antenna system has a low gain antenna (LGA) and a low noise amplifier/diplexer (LNA/DIP).
EFFECTIVITY BEJ ALL 23-15-00
Config 008
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777 AIRCRAFT MAINTENANCE MANUAL
SATCOM SYSTEM -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 23-15-00
Config 008
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D633W101-BEJ Sep 05/2002
SATCOM SYSTEM -COMPONENT LOCATIONS -1
Cabin Overhead Area
This equipment is on the E11 rack:
*
Radio frequency splitter (RFS)
*
Radio frequency attenuator (RF ATTN)
*
Radio frequency combiner (RFC)
*
High power relay (HPR)
*
Satellite data unit (SDU)
*
Class C high power amplifier (HPA)
*
Radio frequency unit (RFU)
*
Class A high power amplifier (HPA).
Access
Access to the E11 rack is through a ceiling panel on the left side of the door 3 cross aisle area.
EFFECTIVITY BEJ ALL 23-15-00
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777 AIRCRAFT MAINTENANCE MANUAL
SATCOM SYSTEM -COMPONENT LOCATIONS -1
EFFECTIVITY BEJ ALL 23-15-00
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SATCOM SYSTEM -COMPONENT LOCATIONS -2
High Gain Antenna System
The SATCOM system has two high gain antenna systems, port and starboard (stbd). The port system components are on the left side of the airplane. The starboard components are on the right side of the airplane.
Each high gain antenna system has these components:
*
High gain antenna (HGA)
*
Beam steering unit (BSU)
*
Low noise amplifier/diplexer (LNA/DIP).
Low Gain Antenna System
The low gain antenna system has a low gain antenna (LGA) and a low noise amplifier/diplexer (LNA/DIP) (top).
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