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R  displayed adjacent to line key 2L. This item is not displayed 
R  while in the WAIT USER INPUT state. 
R  (i) The number of signal units in error within a 3 minute sliding 
R  window of approximately 60k received bits and the number of raw 
R  bit errors is displayed adjacent to line key 5L. The raw bit 
R  error number is the same as that presented in the BIT Error Rate 
R  429 word. This (these) item(s) is (are) not displayed while in 
R  the WAIT USER INPUT state. 
R  NOTE : The active advisory LOG-ON> appears adjacent to line key____ 
R  6R when the log-on status is WAIT USER INPUT and the MCDU 
R  is displaying another page. Selection of line key 6R in 
R  those cases displays the SATCOM LOG ON MENU. 
R  (j) Selection of line key 6L returns the MCDU to display the page 
R  shown previous to entering the Log-on page. 
R  (6) SATCOM CABIN DISABLE page 
R  (Ref. Fig. 016) 
R  This page is displayed upon selection of the Cabin Calls ENABLED 
R  prompt in order to disable cabin calls. Selecting CONFIRM* results in 
R  any calls being terminated. New telephone calls are not accepted.

 

R  SATCOM CABIN DISABLE Page 
R  Figure 016
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R  6. Component Description_____________________ 
R  A. Satellite Data Unit (SDU) 
R  (1) Description 
R 
R  The SDU conforms to ARINC 600 Specification. Its case size is 8MCU. 
R  (a) SDU face 
R  (Ref. Fig. 017) 
R  There is a TEST pushbutton and six LED annunciators on the front 
R  face of the SDU: 
R  - a red SDU FAULT 
R  - a red ANT FAULT 
R  - an amber CHANNEL MODULE 
R  - a green CTU AVAILABLE 
R  - a green LOG ON STATUS 
R  - a green SELF TEST PASS 
R 
R  (b) SDU back 
R  (Ref. Fig. 018, 019, 020, 021) 
R 
R  The back comprises a size-two connector including three plugs to 
R  enable: 
R  - connection with peripheral circuits (Top Plug-TP and Middle 
R  Plug-MP) 
R  - connection with power supply circuits and antenna (Bottom 
R  Plug-BP). 
R  Index pin code 06 is used. 
R  (2) Characteristics 
R 
R  The SDU complies with the standards defined in ARINC 761. 
R  Weight : 12.8 Kg (28.1 lbs). 
R  Size : 8 MCU 
R  Power requirement : 115VAC, 400 Hz or 28VDC 
R  Power dissipation : 350 Watts maximum 
R  Operating temperatures : -40 deg.C (-40.00 deg.F) to +70 deg.C 
R  (+158.00 deg.F) 
R  Operating altitudes : to 55,000 ft. (16763.69 m)

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R  Satellite Data Unit 
R  Figure 017
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R  SDU - Back 
R  Figure 018
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R  SDU - Pin Assignment - Top Plug 
R  Figure 019
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R  SDU - Pin Assignment - Middle Plug 
R  Figure 020
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R  SDU - Pin Assignment - Bottom Plug 
R  Figure 021
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R  (3) General operation 
R 
R  The SDU is the heart of the SATCOM system. It interfaces with other 
R  onboard avionics such as the aircraft navigation system (ADIRU1, 
R  ADIRU2) which provides attitude and position information for antenna 
　
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