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R  pointing purposes and ACARS for data link. It performs most of the 
R  data-handling, protocol, modulation/coding and demodulation/decoding 
R  functions of the Aircraft Earth Station (AES). It uses a wired 
R  aircraft SATCOM address. 
R  B. Antenna 
R  (1) Description 
R  (Ref. Fig. 022) 
R 
R  The intermediate gain antenna is top-mounted with an adapter plate on 
R  fuselage of aircraft. 
R 
R  (a) Antenna connection 
R  The antenna is equipped with three connectors from the SDU. 
R  (2) Characteristics 
R 
R  Weight : 10.9 Kg (24.00 lbs). 
R  Operating altitude: up to 50,000 ft. (15239.72 m) 
R  Temperature range: -55 deg.C (-67.00 deg.F) to 70 deg.C (158.00 
R  deg.F). 
R  Receive band: 1530 - 1559 MHz 
R  Transmit band: 1626.5 - 1660.5 MHz 
R  Antenna gain: 6 dBic. 
R  (3) General operation 
R 
R  The intermediate gain antenna is an electronically steerable phased 
R  array. Simultaneous transmission and reception of satellite signals 
R  (full duplex operation) provides two bands of operation: receive (Rx) 
R  band, and transmit (Tx) band. 
R  Beam steering of the antenna is performed via serial transmission of 
R  phase shifter data and RF signals from the SDU and reception. 
R  The intermediate gain antenna provides +6 dBic nominal gain with near 
R  hemispherical coverage.

 1EFF : 401-499, 1 23-28-00Page 36 1 1 Aug 01/05 1 1 1CES 1

R  Intermediate Gain Antenna - Top 
R  Figure 022
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R  7. Operation/Control and Indicating________________________________ 
R  A. System Applications 
R 
R  (1) Data communication services 
R 
R  Cockpit data through SATCOM is an extension of the ATSU 
R  functionality. Communications using SATCOM rather than VHF3 are 
R  automatically selected when VHF3 is not available. 
R  Previously formatted data for SATCOM is transmitted to the ATSU in a 
R  series of short bursts or packets. 
R 
R  (2) Voice communication services 
R  Two channels are dedicated to the cabin (phone or fax). 
R  The airborne telephone cabin system provides civil airline passengers 
R  with a direct dial call facility via the international public 
R  switched telephone network. The system provides voice services in 
R  digital form through the use of voice coding devices called codecs. 
R  The codec transmission rate currently used is 9.6 kilobits per 
R  second. 
R  As the cockpit has priority over the cabin services, the two channels 
R  can be switched from the cabin to the cockpit for flight crew cockpit 
R  voice use. 
R  The cockpit voice interface is controlled by the Audio Control Panels 
R  (ACP) for the call number selection and by the Flight Warning 
R  Computer (FWC) for the display of the associated SATCOM 
R  memo/cautions. 
R  B. General Operation 
R  (1) RF channel configuration 
R 
R  A set of four RF transmission channels is needed to accommodate the 
R  full range of voice and data services. Any given channel can pass 
R  information in one direction only. Therefore, for simultaneous 
R  two-way communications (Full-Duplex operation), a pair of channels is 
R  assigned. A basic description of the four basic channel types is 
R  given below: 
R 
R  - P-Channel (Packet-mode channel): 
R  A time-division multiplexed channel is used for ground-to-air 
R  signalling, control and data communications. There are two types of 
R  P-Channel: Psmc (system management and control) and Pd (data). 
R  A Psmc-Channel is continuously broadcast by each GES to inform 
R  users of system status and configuration. It also carries the time

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