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R  MHz). 
R  The Aero-I SATCOM system (conformed to ARINC 761) uses an intermediate gain 
R  terminal, exploiting the higher power of the Inmarsat 3 satellite. Aero-I 
R  allows the aircraft flying within spot beam coverage to transmit and receive 
R  multichannel voice, fax and circuit mode data services. Packet mode data 
R  services and emergency calls are available world-wide in the global beam. 
R  2. Component Location__________________ 
R  (Ref. Fig. 003)
 -------------------------------------------------------------------------------
FIN  |  FUNCTIONAL DESIGNATION  | PANEL|ZONE|ACCESS |  ATA
 |  |  |  | DOOR  |  REF.
 -------------------------------------------------------------------------------
105RV1  SDU  80VU 120  811  23-28-00
 116RV1  ANTENNA  200  23-28-00 
R  3. System Description__________________ 
R  (Ref. Fig. 004, 005) 
R 
R  A. SATCOM System 
R  The Satellite Data Unit (SDU) is the interface to all other aircraft 
R  systems, including the ACARS system. It contains all data processing 
R  functions, as well as the modems, channel tuning synthesizers, Hight 
R  Stability Reference Oscillator, to/from IF to/from L-band conversion and 
R  Hight Power Amplifier (HPA). The SDU also contains a voice CODEC, modem, 
R  and synthesizer pair for each the voice channels installed. 
R  B. Intermediate Gain Antenna 
R  The intermediate Gain Antenna (IGA) consists of a 6dBi gain (nominal) 
R  electronically steered directional antenna plus an internal LNA/Diplexer. 
R  4. Power Supply____________ 
R  (Ref. Fig. 006) 
R  The SDU is supplied with 115VAC from the main 115VAC Bus 2 bar (via the 
R  sub-busbar 101XP-C). 
R  The SDU is supplied through this circuit breaker: 
R  - 102RV 

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R  General SATCOM System Architecture 
R  Figure 001
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R  Satellite Coverage 
R  Figure 002
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R  SATCOM - Component Location 
R  Figure 003
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R  SATCOM - General Architecture 
R  Figure 004
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R  SATCOM - Internal Architecture 
R  Figure 005
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R  SATCOM - Power Supply 
R  Figure 006
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R  5. Interface_________ 
R 
R  The architecture of the SATCOM interface is shown in figure 
R  (Ref. Fig. 007) 
R  The SDU is linked to: 
R  - the Centralized Fault Display System (CFDS) (Ref. 31-32) 
R  - the Landing Gear Control and Interface Units 1 and 2 (LGCIU) (Ref. 32-31) 
R  - the data loader (Ref. 31-38) 
R  - the Air Data/Inertial Reference Units (ADIRU) (Ref. 34-12) 
R  - the Cabin Telecommunications Unit (Ref. 23-35-00) 
R  - the Multipurpose Control and Display Units 1, 2 and 3 (MCDU) (Ref. 22-82) 
R  - the Flight Warning Computers 1 and 2 (FWC) (Ref. 31-50) 
R  - the Audio Management Unit (AMU) (Ref. 23-50) 
R 
R  - the Air Traffic Service Unit (ATSU) (Ref. 46-21) 
R  A. ATSU-SDU Interface 
R 
R  An ARINC 429 data bus provides communications between the SDU and the 
R  ATSU. There are two basic types of communications conducted over these 
R  circuits. 
　
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