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operations shall be corrected by inserting +E+E+E+
following the error, then retyping the last correct word (or
group).
4.4.15.3.9 When it is not discovered until later in the
origination process that an error has been made in the text, the
correction shall be separated from the last text group, or
confirmation, if any, by an alignment function [ G I . This shall
be followed by the abbreviation COR and the correction.
4.4.15.3.10 Stations shall make all indicated corrections
on the page-copy prior to local delivery or a transfer to a
manually operated circuit.
4.4.15.3.11 The text of messages entered by the AFTN
origin station shall not exceed 1 800 characters in length.
AFTN messages exceeding 1 800 characters shall be entered
by the AFTN origin station in the form of separate messages.
Guidance material for forming separate messages from a
single long message is given in Attachment B to Volume 11.
When messages or data are transmitted only on medium or
high speed circuits the text may be increased to a length that
exceeds 1 800 characters as long as performance characteristics
of the network or link are not diminished and subject
to agreement between the Administrations concerned.
4.4.15.3.12.1.3 Messages entered by the AFTN origin
station shall not exceed 2 100 characters in length.
N o t e . The character count includes all printing and nonprinting
characters in the message from and including the
start-of-heading character (SOH) to and including the end-oftext
character.
4.4.15.4 Except as provided in 4.4.15.5 to 4.4.15.6 and
4.4.16, the procedures of 4.4.8 and 4.4.9 to 4.4.13 shall be
used for messages using IA-5 code.
4.4.15.5 Channel-check transmissions. In the case where
continuous control of channel condition is not provided the
following periodic transmissions shall be sent on teletypewriter
circuits:
1) heading line (see 4.4.15.1.1);
S
2) alignment function T ;
X
3) the procedure signal CH;
E
N o t e . The character count includes all printing and non- 4) alignment function T .
printing characters in the text from, but not including, the X
start-of-text signal to, hut not including, the Jirst alignment
function of the ending. The receiving station shall then check the transmission
identification of this incoming transmission to ensure its
correct sequence in respect of all messages received over that
4.4.15.3.12 Ending incoming channel.
4.4.15.3.12.1 The ending of a message shall comprise the
following in the order stated:
a) an alignment [-+I function following the last line of
text,
b) page-feed character, character 011 1 (VT);
c) end-of-text character 013 (ETX)
4.4.15.3.12.1.1 Recommendation.- Station terminal
equipment (page printers) on the International Alphabet
Number 5 (IA-5) shall he provided with a capability to
generate suficient line feed functions for local station use
upon the reception of a VERTICAL TAB character (0/11).
4.4.15.3.12.1.2 Recommendation.- When the message
does not transit ITA-2 portions of the AFTN, or where
Administrations have made provisions to add automatically
N o t e . Application of this procedure provides some
measure of assurance that channel continuity is maintained;
however, a continuously controlled channel is much more
preferable in that data integrity can also be improved.
4.4.15.5.1 Recommendation.- Where a circuit is
unoccupied and uncontrolled, the transmission identzJied in
4.4.15.5 should he sent at H + 00, H + 20, H + 40.
4.4.15.6 The receipt of distress messages (priority
indicator SS, see 4.4.1.1.1) shall be individually acknowledged
by the AFTN destination station by sending a service message
(see 4.4.1.1.9) to the AFTN origin station. Such acknowledgement
of receipt shall take the format of a complete
message addressed to the AFTN origin station, shall be
assigned priority indicator SS and the associated priority alarm
(see 4.4.15.2.2.5), and shall have a text comprising:
1) the procedure signal R;
27111103
No. 78
Annex 10 - Aeronautical Telecommunications Volume 11
2) the origin line (see 4.4.15.2.2) without priority alarm, or
optional heading information of the message being
aclmowledged;
3) the ending (see 4.4.15.3.12.1).
N o t e . The,following example illustrates the application of
the 4.4.15.6 procedures:
Heading (see 4.4.15.1.1)
<= SS + LECBZRZX <=
121322 + EGLLYFYX (Priority Alarm) G
S
TR + 12 13 19 + LECBZRZX <=
X
Ending ( ~ e4e. 4.15.3.12.1)
N o t e . The,following example illustrates a typical text of a
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