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ird-swg08-wp11 - icao 24 bit address rev1

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					     ICAO – ACP – WGM – 8th MEETING OF THE
       IRIDIUM SUBGROUP 13 – 15 MAR 2007




                 ICAO 24-BIT ADDRESS
                     (Mode S code)




13-15 MAR 2007          Bernard KORSEC       1
        ICAO – ACP – WGM – 8th MEETING OF THE IRIDIUM
                 SUBGROUP 13 – 15 MAR 2007
                        SEVERAL POSSIBILITIES EXIST

From the ATC Mode S Transponders, the ARINC 429 Labels 275 and 276
 provide the « ICAO 24-bit Address ».
  (ARINC Characteristic 761, Page 31, Attachment 1-4, Paragraph 3 « ICAO 24-bit
  aircraft address »).
A CM (Configuration Module) mounted externally to the SDU (Satcom Data Unit).

                                     REMARKS

An ARINC Characteristic for IRIDIUM Satcom, based on the existing « 761 » maybe
helpful for SDU manufacturers and operators, knowing that the airplane
manufacturers already designed and have sometimes provisioned airplanes for the
« ARINC Characteristic 761 ».

This will make easy any retrofit to the IRIDIUM System concerning the interfaces
between airplane and IRIDIUM SDU.

    13-15 MAR 2007                   Bernard KORSEC                            2
         ICAO – ACP – WGM – 8th MEETING OF THE IRIDIUM
                  SUBGROUP 13 – 15 MAR 2007
SUGGESTION: Concerning the ICAO 24-bit Address and the telephone
                  number.
Considering the following ICAO 24-bit address in octal coding: 76543210
Why not having the ICAO 24-bit address part of the phone number with a
 prefix indicating that the present phone number contains an ICAO 24-bit
 address:
                                    8816 X76 543 210
 (X indicating a telephone number including an ICAO 24-bit Address - To be defined by IRIDIUM)

No mapping required
From AES to GES: only the first five digits to be removed before
 forwarding the message into the ATN.
From GES to AES: only the first five digits to be added by IRIDIUM before
 forwarding the message to the airplane.
     13-15 MAR 2007                      Bernard KORSEC                                3

				
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