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BEL (0/7) characters.
N o t e . Use of the priority alarm will actuate a hell
(attention) signal at the receiving teletypewriter station, other
than at those ,fully automatic stations which may provide a
similav alarm on receipt of priority indicator SS, thereby
alerting supervisory personnel at relay centres and operators
at trihutay stations, so that immediate attention may he given
to the message.
4.4.15.2.2.6 The inclusion of optional data in the origin
line shall he permitted provided a total of 69 characters is not
exceeded and subject to agreement between the
Administrations concerned.
4.4.15.2.2.6.1 Recommendation.- The presence of the
optional datafield should he indicated by one occurrence of
the space character and terminated by the alignment,function.
4.4.15.2.2.6.2 Recommendation.- When additional
addressing information in a message needs to he exchanged
between source and destination addresses, it should he
conveyed in the optional data,fieJd (ODF), using the,folJowing
speczfic format:
a) character,^ one and full stop (I.) to indicate the
pammeter code ,for the udditional addvess ,function;
h) three modtfier characters, ,followed by an equal sign (=)
and the assigned 8-character ICAO address; and
c) the character hyphen (-) to terminate the additional
addvess parameter3eld.
4.4.15.2.2.6.2.1 Recommendation.- When a separate
address for service messages or inquiries is d@erent,fmm the
originator indicator; the modlfier SVC should he used.
4.4.15.2.2.7 The origin line shall be concluded by an
alignment function [<=I and the start-of-text (STX) (012)
character.
4.4.15.3 Text
4.4.15.3.1 The text of messages shall be drafted in
accordance with 4.1.2 and shall consist of all data between
STX and ETX.
N o t e . When message texts do not require conversion to
the ITA-2 code and ,fovmat and do not conflict with ICAO
message types or ,formats in PANS-ATM (Doc 4444),
Administrutions may make,full use of the chumcters available
in International Alphabet No. 5 (IA-5).
4.4.15.3.2 When an originator's reference is used, it shall
appear at the beginning of the text, except as provided in
4.4.15.3.3 and 4.4.15.3.4.
4.4.15.3.3 When the ICAO three-letter designators YXY,
YYY or ZZZ comprise the second element of the addressee
indicator (see 4.4.15.2.1.3.1 and 4.4.15.2.1.3.2) and it,
therefore, becomes necessary to identify in the text the specific
addressee of the message, such identification group shall
precede the originator's reference (if used) and become the
first item of the text.
4.4.15.3.4 When the ICAO three-letter designators YXY,
YYY or ZZZ comprise the second element of the originator
indicator (see 4.4.15.2.2.3 and 4.4.15.2.2.4) and it thus
becomes necessary to identify in the text the name of the
organization (or military service) or the aircraft which
originated the message, such identification shall he inserted in
the first item of the text of the message.
4.4.15.3.5 When applying the provisions of 4.4.15.3.3 and
4.4.15.3.4 to messages where the ICAO three-letter
designator(s) YXY, YYY, ZZZ refer to two or more different
organizations (or military services), the sequence of further
identification in the text shall correspond to the complete
sequence used in the address and originator indicator of the
message. In such instance, each addressee identification shall
be followed immediately by an alignment function. The name
of the (YXY, W Y or ZZZ) organization originating the
message shall then he preceded with "FROM". "STOP"
followed by an alignment function shall then be included in
the text at the end of this identification and preceding the
remainder of text.
4.4.15.3.6 An alignment function shall be transmitted at
the end of each printed line of the text. When it is desired to
confirm a portion of the text of a message in teletypewriter
operation, such confirmation shall be separated from the last
text group by an alignment function [<=I, and shall be
indicated by the abbreviation CFM followed by the portion
being confirmed.
Chapter I Annex 10 - Aeronautical Telecommunications
4.4.15.3.7 Where messages are prepared off-line, e.g. by the second carriage return before transmission to an ITA-2
preparation of a paper tape, errors in the text shall be corrected circuit, one carriage return in the alignment function and endby
backspacing and replacing the character in error by of-line function should be permitted subject to agreement
character DEL (711 5). between the Administrations concerned.
4.4.15.3.8 Corrections to textual errors made in on-line
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