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this action being given to the station that had made the
previous transmission.
4.4.10.1.1.2 Recommendation.- An AFTN message
originator not capable of handling service messages should
agree with the AFTN centre it is connected to on a method of
exchanging service messages.
N o t e . A method of specifjiing service address in the
optional data,field is shown in 4.4.4.4.2 and 4.4.4.4.2.1.
4.4.10.1.2 Form of transmission - teletypewriter operation.
All transmissions shall comprise in the following order
(see Figure 4-2).
4.4.10.1.2.1 Starting pulse. When the receiving station
uses equipment fitted with a time-switch to stop the teletypewriter
machine motor when the channel is idle, a 20-30 millisecond
SPACING IMPULSE shall be transmitted when the
channel has been at rest for 30 seconds or more and at least
1.5 seconds shall be permitted to elapse before the
transmission of the heading.
Note I . Th is is equivalent to the transmission of a
LETTER SHIFT [J], followed by a pause (i.e. a continuous
MRKING IMPULSE) of at least 1.37 seconds.
Note 2.- Application of this procedure will allow the
receiving equipment to reach synchronization before
transmission of the heading is commenced.
4.4.10.1.3 Message ,format. All messages shall be
prepared in accordance with the provisions of 4.4.2 (ITA-2
format) or 4.4.15 (IA-5 format).
Chapter 4 Annex 10 - Aeronautical Telecommunications
Figure 4-2. Form of transmission - teletypewriter operation (see 4.4.10.1.2)
PULSE
(if necessary)
4.4.10.1.3.1 Recommendation.- The Heading Line,
with the exce~tiono f the SOH characte~s hould he omitted on
HEADING
circuits employing one of the data link control procedures
contained in 8.6.3 and 8.6.4 of Annex 10, Volume 111.
4.4.10.1.4 Reprocessing procedures
ADDRESS
4.4.10.1.4.1 A message requiring retransmission shall
have its previous heading deleted by the station which received
such message for relay. The retransmission shall commence
with the new heading using the transmission identification for
the outgoing channel.
4.4.10.1.4.1.1 When applying the provisions of
4.4.10.1.4.1, transmission of the address part of the message
shall commence at some point during the 5 SPACES, 1
LETTER SHIFT [+++++dl immediately preceding the
first alignment function [ G I .
ORIGIN
4.4.10.1.4.1.2 At tributary and "torn-tape" relay stations
not equipped with automatic numbering machine devices and
hence where it is necessary for a small number of additional
teletypewriter characters to be perforated on a tape before the
start-of-message signal to preclude risk of mutilation of the
TEXT
latter signal during retransmission, such additional characters,
as required, shall consist of LETTER SHIFTS [J]. Subsequent
ENDING
transmission on the outgoing channel shall then commence at
a point as close as practicable to the start-of-message signal.
4.4.10.1.4.1.3 At stations where the heading of a message
is originated by automatic equipment at the point of and time
of transmission on the outgoing channel, but where
preparation of the other parts of a message is by the
perforation of a tape and where, therefore, it is necessary for
a small number of additional teletypewriter characters to be
perforated before the alignment function [<=I at the
commencement of the address so as to preclude risk of
mutilation of this alignment function, such additional
characters, as required, shall consist of LETTER SHIFTS [J]
or SPACES [+I. Subsequent transmission on the outgoing
channel shall then commence at a point as close as practicable
to the first alignment function [<=I of the message.
4.4.10.1.4.2 At a "tom-tape" station the incoming tapes
shall be torn at a position in the message-separation signal
component (see 4.4.6.1 and 4.4.7.1) so that the preceding endof-
message signal remains intact.
4.4.10.1.4.2.1 Following application of the provisions of
4.4.10.1.4.2 the shortened (i.e. less than 12 LETTER SHIFTS
[J]) message-separation signal remaining on the message tape
shall be deleted, if necessary by electronic methods, before
retransmission to an automatic relay installation. If the
retransmission is to another "tom-tape" station then:
1) the shortened message-separation signal shall be
reformed to a complete [JJJJJJJJJJJJ] signal by
transmission of the necessary number of additional
LETTER SHIFTS [J]; or
2) the shortened message-separation signal remaining on
the tape shall be removed and a new and complete
message-separation signal shall be added to the message
　
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