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networks are contained in 4.3.
Note 3.- The AFTN provides a store-and~forward
messaging service,for the conveyance of text messages in ITA-
2 or IA-5 .format, using character-oriented procedures.
Provisions relating to the AFTN are contained in 4.4.
Note 4.- The CIDINprovides a common transport service
,for the conveyance of binary or text application messages, in
support of the AFTN and OPMET applications. Procedural
provisions relating to the CIDIN are contained in 4.5.
Note 5.- The ATS (air trufic services) message handling
services ( A T S W application allows ATS messages to be
exchanged between service users over the aeronautical
telecommunication network (ATN) internet communication
service (ICS). Procedural provisions relating to ATS message
handling services are contained in 4.6.
Note 6.- The inter-centre communications applications
enable the exchange of information between air trufic service
units over the aeronautical telecommunication network (ATN)
internet communication service (ICS), in support of
notification, coordination, transfer of control, ,flight planning,
airspace management and air t r G c ,flow management.
Procedural provisions relating to inter-centre c~mmunication~s
are contained in 4.7.
Note 7.- The aeronautical telecommunication network
through its ATSMHS and ICC applications enable the
transition of existing AFTN and CIDIN users and systems into
the ATN architecture.
4.1.2 Material permitted in
AFS messages
N o t e . The provisions contained in 4.1.2 do not apply to
ATS voice communications.
4.1.2.1 The following characters are allowed in text
messages:
Letters: ABCDEFGHIJKLMNOPQRSTUVWXYZ
Figures: 1 2 3 4 5 6 7 8 9 0
Other signs: -
?
(hyphen)
(question mark)
(colon)
(open bracket)
(close bracket)
(full stop, period, or decimal point)
(comma)
(apostrophe)
(double hyphen or equal sign)
(oblique)
(plus sign)
Characters other than those listed above shall not be used in
messages unless absolutely necessary for understanding of the
text. When used, they shall be spelled out in full.
4.1.2.2 For the exchange of messages over the
teletypewriter circuits, the following signals of the
International Telegraph Alphabet No. 2 (ITA-2) shall be
permitted:
signals nos. 1 to 3 - in letter and in figure case;
signal no. 4 - in letter case only;
signal no. 5 - in letter and in figure case;
signals nos. 6 to 8 - in letter case only;
signal no. 9 - in letter and in figure case;
signal no. 10 - in letter case only; and
signals nos. 11 to 3 1 - in letter and figure case.
ANNEX 10 - VOLUME I1 4-1 1/11/01
Annex 10 - Aeronautical Telecommunications Volume 11
Note I . "Letter case" and ':figure case" are to he
understood as the sh@ condition in which the equipment
associated with the channel was positioned prior to the
reception of the signal.
Note 2 . Wken using any of the above signals, account is
to he taken of; amongst others, the provisions of 4.4.5.3.
Note 3 . The ,foregoing provisions of 4.1.2.2 are not
intended to prevent the use of
a) ,figure case of signals nos. 6, 7 and 8 after bilateral
agreements between States having telecommunication
stations directly connected to each other;
h) ,figure case of signal no. 10 as the priority alarm (see
4.4.4.3); and
c) ,figure case of signal no. 4,for operational purposes only
and not ax part of a message.
4.1.2.3 For the exchange of messages over the
teletypewriter circuits, the following characters of International
Alphabet No. 5 (IA-5) shall be permitted:
- characters 011 to 013, 017 - in the priority alarm (see
4.4.15.2.2.5), 0110, 0111 - in the ending sequence (see
4.4.15.3.12.1), 0113;
- characters 210, 217 to 219, 211 1 to 211 5;
c h a r a c t e r s 310 to 3110, 3113, 3115;
- characters 411 to 411 5;
- characters 510 to 5110; and
- character 711 5.
2) character 012 (STX) other than the one in the origin line
as prescribed in 4.4.15.2.2.7;
3) character 013 (ETX) other than the one in the ending as
prescribed in 4.4.15.3.12.1;
4) any uninterrupted sequence of characters 5/10,4/3,5110,
413 in this order (ZCZC);
5) any uninterrupted sequence of characters 2111, 3/10,
211 1, 3110 in this order (+:+:);
6) any uninterrupted sequence of four times character 4/14
(NNNN?; and
7) any uninterrupted sequence of four times character 2112
(>>,,I.
4.1.2.7 The text of messages shall be drafted in plain
language or in abbreviations and codes, as prescribed in 3.7.
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