(b)
Message format The format of the messages exchanged between the ground and the aircraft is as follows (in the transmission order):
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ATIMS - Ground Network World Map R Figure 010
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ATIMS - Ground Network World Map
Figure 010A
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ATIMS - ISO Alphabet No. 5
Figure 011
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-21-00Page 39 1401-499, 1Aug 01/05 1 1 1CES 1 indicates the start of data transmission.
Start of heading (1 character)
Mode (1 character)
Address (7 characters)
Technical acknowledgement (1 character)
Label (2 characters)
Uplink block identifier (1 character)
Downlink block identifier (1 character)
Start of text (1 character)
Text (220 characters max)
Suffix (1 character)
Block check sequence (BCS) (2 characters)
BCS suffix (1 character)
- Start of heading:
-Mode: enables selection of a ground station or a specific group of ground stations for communication with the aircraft.
-Address: contains the identification of the aircraft which transmits or receives the message.
-Technical acknowledgement: acknowledgement (either positive or negative) related to the last message received.
-Label: identifies a specific type of message.
-Uplink block identifier: only appears in the messages transmitted by the ground. Enables the aircraft to detect duplicated ground messages (aircraft-to-ground messages may have a downlink block identifier to enable detection of duplicated aircraft messages on the ground).
-Downlink block identifier: only appears in the message transmitted by the aircraft. Enables the ground to detect duplicated messages.
-Start of text: indicates the start of useful data transmission.
-Text:
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useful data. Only one part of the ISO 5 characters can be transmitted in this field.
-Suffix: indicates the end of useful data transmission.
-Block check sequence: result of a computation made before transmission on the previous bit set. At reception, the same computation is made and the two results are compared. If they are identical, the transmission is correct.
R 1EFF : 151-152, 201-203, 1 46-21-00Page 41 1 1 May 01/04 1 1 1CES 1R **ON A/C 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,
Post SB 46-1009 For A/C 151-152,201-203,
Post SB 46-1013 For A/C 151-156,201-209,
D. Interface with the ground network
(1) Ground network architecture (Ref. Fig. 010A) The airline can exchange data with its aircraft through a ground network which is managed by the following world service providers:
ARINC AFRICA ARINC AMERICA ARINC ASIA ARINC EUROPE ARINC KOREA AVICOM DEPV BRAZIL SITA EUROPE SITA LATIN AMERICA SITA NORTH AMERICA SITA PACIFIC
In this ground network, each service provider is responsible for its
own network.
The networks are interconnected, therefore the data is transferred
over any network.
The aircraft is in liaison with the network through the VHF.
On the ground, each service provider works on a special frequency:
-------------------------------------------------------------------------| ABBREVIATION | SERVICE PROVIDER | MCDU LABEL | FREQUENCY | FAMILY | -------------------------------------------------------------------------| AF | ARINC AFRICA | ARI-AFR | 126.900 MHz | ARINC | | AM | ARINC AMERICA | ARI-AM | 131.550 MHz | ARINC | | AS | ARINC ASIA | ARI-ASI | 131.450 MHz | ARINC | | AE | ARINC EUROPE | ARI-EUR | 136.925 MHz | ARINC | | AK | ARINC KOREA | ARI-KOR | 131.725 MHz | ARINC | | AV | AVICOM | AVICOM | 131.450 MHz | SITA | | DE | DEPV BRAZIL | DEPV | 131.550 MHz | SITA | | SE | SITA EUROPE | SITA-E/A | 131.725 MHz | SITA | | SL | SITA LATIN AMERICA | SITA-LAM | 131.725 MHz | SITA | | SN | SITA NORTH AMERICA | SITA-NAM | 136.850 MHz | SITA | | SP | SITA PACIFIC | SITA-PAC | 131.550 MHz | SITA | ---------------------------------------------------------------------------
R 1EFF : 106-149, 151-156, 159-199, 201-299, 1 46-21-00Page 42 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1
(2) Data exchange between aircraft and ground network (Ref. Fig. 011)
(a)
Data coding The signal transmitted by the ATSU to the VHF 3 is modulated with the VHF radio signal and then, sent to the ground. Conversely, the signal transmitted by the VHF 3 to the ATSU is obtained after demodulation of the radio signal from the ground. The transmitted data are characters from the ISO alphabet No.5 except the block check sequence field at the end of transmission.
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