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~ Filing Time
Alignment Function@) 1 One CARRIAGE RETURN, one LINE FEED I <=
One FIGURE SHlFT
The 6-digit date-time group specifying when the message was tiled for transmission T . . . . . . 1
One LETTER SHlFT
I
One SPACE
The 8-letter group identifying the message originator
Priority Alarm (used only in teletypewriter
operation for Distress
Messages)
One FIGURE SHlFT
Five Signal No 10 of Telegraph Alphabet No 2
One LETTER SHlFT
1' Anention J
S~gnal(s)
Beginning of the Text
Alignment Function
Specific identificat~ono f Addressee(s) (if necessary) with
each followed by one CARRIAGE RETURN, one LlNE FEED (if necessary)
The English word FROM (if necessary) (see 4 4 5 2 3)
Specific identificaton of Originator (if necessary)
The English word STOP followed by one CARRIAGE RETURN, one LlNE FEED jii
necessary) (see 4 4 5 2 3), andlor
Originator's reference (if used)
1 One CARRIAGE RETURN, one LINE FEED I <= I
~ Message Text
Message Text with one CARRIAGE RETURN, one LlNE FEED at the end of each
printed line of the Text except for the last one (see 4 4 5 3)
1 1 1 a) One CARRIAGE RETURN. one LINE FEED 1
Confirmation (if necessary)
Corredion (if necessary)
a) One CARRIAGE RETURN, one LlNE FEED
b) The abbreviation CFM followed by the portion of the Text being confirmed
bj The abbreviation COR followed by the correciion of an error made in the preceding
Text
End-of-Text Signal ~r l
a) One LETTER SHIFT
b) One CARRIAGE RETURN, one LlNE FEED
Page-Feed Sequence
End-of-Messaae Sianal
Figure 4-1. Message format ITA-2
(the above illustrates the teletypewriter message format prescribed in 4.4.2 to 4.4.9.1 inclusive)
ENDING
(see 4 4 6)
Seven LINE FEEDS
Four of the letter case of N iSianal No 14) NNNN
I Tape Feed (see 4 4 7) arrangements have been made for tape-feed transmissions to be employed on an I
I incoming circuit (see 4 4 7) I
L - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2
Legend 7' FIGURE SHlFT (Signal No. 30) 1 LlNE FEED (Slgnal No. 28) LETTER SHlFT (Slgnal No. 29)
+ SPACE (Signal No. 31) < CARRIAGE RETURN (Signal No. 27)
Message-Separation Signal (used
only on message traffic transmitted
to a 'Torn-tape" station)
Additional LETTER SHIFTS will appear at this point in instances where prior I
Twelve LETTER SHIFTS lLLllllLLlll
Chapter I Annex 10 - Aeronautical Telecommunications
4.4.2.1.2 In teletypewriter operation, the spacing
signal, consisting of 5 SPACES [+++++I followed by
1 LETTER SHIFT [J], shall be transmitted immediately
following the transmission identification prescribed in
4.4.2.1.1.3.
N o t e . The examples appearing below illustrate the
application of the transmission identjfication Standard (see
4.4.2.1.1 b) and 4.4.2.1.1.3):
Tape Page-copy
(This indicates the 39th message of the day transmitted on
Channel B of the circuit,from Station G to Station L.)
4.4.2.1.3 Optional service information shall be permitted
to be inserted following the transmission identification subject
to agreement between the authorities responsible for the
operation of the circuit. Such additional service information
shall be preceded by a SPACE followed by not more than ten
characters and shall not contain any alignment functions.
4.4.2.1.4 Recommendation.- To avoid any
misinterpretation of the diversion indicator especially when
considering the possibility of a partly mutilated heading, the
sequence of two consecutive signals no. 22 (in the letter case
or in the figure case) should not appear in any other
component of the heading.
4.4.3 Address
4.4.3.1 The address shall comprise:
a) alignment function [<=I;
b) priority indicator;
c) addressee indicator(s);
d) alignment function [<=I.
4.4.3.1.1 The priority indicator shall consist of the
appropriate two-letter group assigned by the originator in
accordance with the following:
Message category
Priority
indicator
distress messages (see 4.4.1.1.1) . . . . . . . . . . . SS
urgency messages (see 4.4.1.1.2) . . . . . . . . . . . DD
flight safety messages (see 4.4.1.1.3). . . . . . . . FF
meteorological messages (see 4.4.1.1.4) . . . . . GG
flight regularity messages (see 4.4.1.1.5) . . . . GG
aeronautical information services
messages (see 4.4.1.1.6) . . . . . . . . . . . . . . . . . GG
aeronautical administrative messages
(see4.4.1.1.7) . . . . . . . . . . . . . . . . . . . . . . . . . . KK
service messages (see 4.4.1.1.9) . . . . . . . . . . . (as appropriate)
　
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