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the text to, hut not including, the end-of-text signal. page-copy at this position.
4.4.6 Ending
4.4.6.1 The ending shall comprise:
a) the page-feed sequence consisting of 7 LINE FEEDS
N o t e . This, together with the I LINE FEED of the
preceding alignment function, will provide sufficient
separation between messages when appearing in pagecopy
form.
b) the end-of-message signal, consisting of the letter N
(letter case of signal no. 14), appearing FOUR times in
undivided sequence.
Note 2 C . In actual station practice, messages would he
separated on page-copy by tearing through the page-feed
sequence. The end-ofmessage signal would then appear to
have become a component part of the next message. This
apparent misplacement is, however, unlikely to give rise to any
misunderstanding on the part of communicators or addressees
since, in practice, the end-of-message signal has no
signtficance on page-copy.
4.4.6.2 AFTN 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
non-printing characters in the message from and including the
start-ofmessage signal (ZCZC) to and including the end-ofmessage
signal JNNNNN).
N o t e . This component, transmitted intact from the 4.4.7 Tape feed
moment of the first transmission of the message until
ultimate delivery, is required so that connections set up 4.4.7.1 Recommendation.- In "torn-tape" instalfor
cross-office transmission, at a semi-automatic or lations, and in "semi-automatic" installations using
fully automatic relay installation, can be cleared for continuous tape technique, when signals additional to those
following message trafJic. prescribed in 4.4.6.1 are required to ensure that the tape is
27/11/03
No. 78
Chapter I Annex 10 - Aeronautical Telecommunications
adequately advanced ,from the repeyforator at the receiving
stations, when the ending of one message is not ,followed
immediately by the start-ofmessage signal of another
message, local arrangements should he made at the receiving
station to avoid the need,for transmission of these signals by
the transmitting station.
N o t e . In "torn-tape" stations, a ,facility is normally
necessary whereby the tape can he ,fed ,from the receiving
repeyforator to an extent that permits the receiving operator to
tear through the message-separation signal at the correct
point, on occasions when the operator is ready to tear the tape
hut there has been no ,following message to cause this tape-
,feed to take place. In semi-automatic stations using
continuous-tape techniques, a similar process may he
necessary in similar circumstances to advance the tape to an
extent that permits the end-ofmessage signal to reach the
transmitter
4.4.7.1.1 When the provisions of 4.4.7.1 cannot be
applied, arrangements shall be made with the transmitting
station for the latter to send, at the end of a single message, or
following the last message of a series, an agreed number of
LETTER SHIFTS [dl in addition to the components
prescribed in 4.4.6.
4.4.8 Stripped address
When applying the provisions of 4.4.3 or 4.4.15.2.1, an AFTN
communication centre shall omit from the address all the
addressee indicators not required for:
a) onward transmission by the AFTN communication
centre to which the message is transmitted;
b) local delivery to the addressee(s) by the AFTN
destination station;
c) onward transmission or local delivery by the aggregate
of stations on a multi-point circuit.
4.4.9 Teletypewriter operating
procedure - general
five minutes. Action shall be taken to deliver or relay each
message correctly received without waiting for the end of the
series.
4.4.9.3 Channel-check transmissions. Except as provided
in 4.4.9.3.3 and 4.4.9.3.5 the following periodic transmissions
shall be sent on teletypewriter circuits:
1) heading (see 4.4.2.1.1);
2) alignment function [<=I;
3) the procedure signal CH;
4) alignment function [<=I;
5) end-of-message signal -1;
6) message-separation signal [ d d d ] (if
required).
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
incoming channel.
N o t e . Application of this procedure provides some
measure of assurance that channel continuity is maintained.
4.4.9.3.1 Recommendation.- Where a circuit is
unoccupied, the transmission spectfied in 4.4.9.3 should he
sent at H + 00, H + 20, H + 40.
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