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R  The first type is the transfer of messages exchanged with the terrestrial 
R  ends of the system. 
R  The second type is the system and maintenance data request and response 
R  messages used for command and control. Messages are identifiable when 
R  transferred through the use of the GFI field in the file transfer 
R  protocol. 
R  The SDU and the ATSU monitor each other's status by exchanging label 270 
R  status words once per second. 
R  B. ADIRU-SDU Interface 
R 
R  For antenna control steering and computed doppler correction, the 
R  following ARINC 429 octal labels are transmitted from the ADIRU to the 
R  SDU: 
R  310 Present position - Latitude 
R  311 Present position - Longitude 
R  312 Ground speed 
R  314 True heading 
R  324 Pitch angle 
R  325 Roll angle 
R  361 Inertial altitude

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R  SATCOM - Interface 
R  Figure 007
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R  C. Cabin Communications System-SDU Interface 
R  A digital CEPT E1 interface is used between the SDU and the cabin system. 
R  The Cabin Communications System (CCS), in conjunction with the Satellite 
R  provides cabin services such as telephone, facsimile, and other 
R  communication interfaces. 
R  The Cabin Communications Unit (CCU) performs onboard Private Automatic 
R  Branch Exchange (PABX) telephony functions that enable the 
R  cabin/passenger telecommunications equipment to make the best use of 
R  resources provided by the SATCOM. 
R  D. Data Loader-SDU Interface 
R 
R  An ARINC 429 bus is used to download the data of the Owner Requirement 
R  Table (ORT) into the SDU. 
R  E. LGCIU-SDU Interface 
R 
R  The LGCIUs transmit air/ground information discrete outputs to the SDU. 
R 
R  F. CFDS-SDU Interface 
R 
R  This avionics package includes the AIRBUS BITE function.

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R  G. MCDU-SDU Interface 
R  (1) SATCOM MAIN MENU page 
R  (Ref. Fig. 008) 
R  The SATCOM MAIN MENU page contains only the SATCOM STATUS prompt. It 
R  provides access to lower level pages 
R  (2) STATUS page 
R  (Ref. Fig. 009) 
R  (a) Present SATCOM System BITE status is displayed adjacent to line 
R  key 1L. This line displays: 
R  <BITE OK (using PAGE SELECT color type) if all SATCOM LRUs pass 
R  BITE and are active on the bus and all installed channel modules 
R  are functional; or 
R  <BITE OK* (using PAGE SELECT color type) if all SATCOM LRUs pass 
R  BITE and are active, but not all installed channel modules are 
R  functional; or 
R  <BITE FAIL (using the FAULT ANNUNCIATION color type) if one or 
R  more LRUs reports a fault or inactivity on the bus. 
R  Only LRUs which are indicated as being installed by the rear 
R  connector pins of the SDU are monitored. Selection of line key 1L 
R  displays the SATCOM BITE STATUS 1/3 page. 
R  (b) Selection of line key 1R displays the SATCOM LOG page. 
R  (c) Selection of line key 2L displays the SATCOM CONFIG page. 
R  (d) Selection of line key 3R determines whether new air-to-ground 
R  calls are accepted from the CTU. Calls already in progress are 
R  not affected. Selecting line key 3R alternates display between 
R  ENABLED* or DISABLED*. The default at power-up is ENABLED*. This 
R  prompt (and the title cabin calls) is not displayed if strapping 
R  indicates no CTU is installed or if the ORT option CEPT ENABLE* 
R  is set to disabled. 
R  (e) Selection of line key 6L when the letters XXXX are in the 
R  scratchpad results in display of the SATCOM TEST page. 
R  (3) SATCOM BITE STATUS pages 
R  The three SATCOM BITE STATUS pages provide indication of fault status 
　
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