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8.5 TECHNICAL PROVISIONS
RELATING TO ATS
MESSAGE TRANSMISSION
8.5.1 Interconnection by direct or omnibus channels -
low modulation rates - 5-unit code.
Note.- See 8.6 below for medium modulation rates.
8.5.1.1 Recommendation.- A FTN techniques (c$ 8.2
above) should be used.
8.6 TECHNICAL PROVISIONS RELATING
TO INTERNATIONAL GROUND-GROUND
DATA INTERCHANGE AT MEDIUM
AND HIGHER SIGNALLING RATES
Note.- Throughout this section in the context of coded
character sets, the term "unit" means the unit of ~etective
information, and is essentially equivalent to the term "bit".
8.6.1 General
8.6.1.1 Recommendation.- In international data
interchange of characters, a 7-unit coded character set
providing a repertoire of 128 characters and desigrrated as
International Alphabet No. 5 (IA-5) should he used.
Compatibility with the 5-unir coded character set of
International Telegraph Alphabet No. 2 (ITA-2) should he
ensured where applicable.
8.6.1.2 When the provisions of 8.6.1.1 above are
applied, International Alphabet No. 5 (IA-5) contained in
Table 8-2 shall be used.
8.6.1.2.1 The serial transmission of units comprising an
individual character of IA-5 shall be with the low order unit
(h,) transmitted first.
8.6.1 2.2 Recommendation.- When IA-5 is used, each
character should include an additional unit for parity in the
eighth level position.
8.6.1.2.3 When the provisions of 8.6.1.2.2 above are
applicd, the sense of the character parity bit shall produce even
parity in links which operate on the start-stop principle, and
odd parity in links using end-to-end synchronous operations.
8.6.1.2.4 Character-for-character conversion shall be as
listed in Tables 8-3 and 8-4 for all characters which are
authorized in the AfTN format for transmission on the AFS
in both IA-5 and ITA-2.
8.6.1.2.5 Characters which appear in only one code set,
or which are not authorized for transmission on the AFS shall
be as depicted in the code conversion tables.
8,6.2 Data transmission
characteristics
8.6.2.1 Recommendation.- The data signalling rate
should be chosen from among the following:
8.6.2.2 Recommendation.- The type of transmission
for each data signalling rate should be chosen as follows:
Data
signalling rate Type of transmission
600 hits/s Synchronous or asynchronous serial
transmission
1 200 hits/s Synchronous or asynchronous serial
transmission
2 400 bits/s Synchronous serial tralzsnzission
4 800 hits/s Synchronous serial transmission
9 600 hits/s Synchronoiis serial transmission
8.6.2.3 Recommendation.- The type of modulationfor
each data signalling rate should be chosen as follows:
Data
signalling rate Type of modulation
600 bits/s Freqwncy
I 200 bits/s Frequency
2 400 hitds Phase
4 800 bits/s Phase
9 600 hitsh Phase-amplitude
Note.- This recommendation does not necessarily apply
to ground-ground extensions of air-ground links used exclusively
for the transfer of air-ground datu, inasmuch as such
circuits may be considered as part of the air-ground link.
8.6.2.4 CHARACTESRT RUCTURE ON DATA LXNKS
8.6.2.4.1 Character parity shall not be used for error
checking on CTD;[lrJ links. Parity appended to L4-5 coded
characters per 8.6.1.2.2 above, prior to entry to the CDIN
shall be ignored. For messages exiting the CIDIN, parity shall
be generated in accordance with 8.6.1.2.3 above.
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
Table 8-2. International Alphabet No. 5 (IA-5)
(international reference version)
NOTES
Note 7.- The formar effectors are intended fof equipment in diacritical sign provided that there is no risk of confusion with
which horizontal and vertical movemenrs are effected separately. another graphic character included in the table.
If equipment requires theaction of CARRIAGE RETURN to be
Note 4. - The graphic characters in position 2/2, 2/7, 2/12 and
combined with a vertical movernenr, the format effector for that
5/14 have respectively the significance of QUOTA TlON MARK,
vertical movement may be used to effect the comblned movement.
Use of FE 2 for a combined CR and LF operation is not
APOSTROPHE, COMMA and UPWARD ARROW HEAD; however,
these characters take on the significance of the diacritical
allowed for international transmission on AFS networks.
signs DIAERESIS, ACUTE ACCENT CEDILLA and CIRCUMFLEX
ACCENT when they are preceded or followed by the
Note 2. - The symbol ,a does nor designate the currency of a
BACKSPACE chars crer 10B,.
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