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be maintained on the regular fixed service frequency normally
SVC’!QSP’!CNL’!C’!K’!BG’!BI“!
in use. In order to re-establish contact on this frequency as
soon as possible there shall be transmitted:
4.4.1.6 Long-term retention of
a) the procedure signal DE;
4.4.1.6 AFTN traffic records
b) the identification of the transmitting station transmitted
4.4.1.6.1 Copies of all messages, in their entirety,
three times;
transmitted by an AFTN origin station shall be retained for a
period of at least 30 days.
c) the alignment function [
Note. The AFTN origin station, although responsible for
d) the letters RY repeated without separation for three lines
ensuring that AFTN traffic is recorded, is not necessarily the
of page copy;
unit where the records are made and retained. By local
agreement the State concerned may permit the originators to
e) the alignment function [
perform those functions.
f) end-of-message signal (NNNN).
4.4.1.6.2 AFTN destination stations shall retain, for a
period of at least 30 days, a record containing the information
The foregoing sequence shall be repeated as required.
necessary to identify all messages received and the action
taken thereon.
4.4.1.5.2.3 A station experiencing a circuit or equipment
failure shall promptly notify other stations with which it is in
Note. The provision for identification of messages
direct communication if the failure will affect traffic routing by
mentioned in 4.4.1.6.2 may be obtained by recording the
those stations. Restoration to normal shall also be notified to
heading, address and origin parts of messages.
the same stations.
4.4.1.6.3 Recommendation. AFTN communication
4.4.1.5.3 Where diverted traffic will not be accepted
centres should retain, for a period of at least 30 days, a record
automatically or where a predetermined diversion routing has
containing the information necessary to identify all messages
not been agreed, a temporary diversion routing shall be
relayed or retransmitted and the action taken thereon.
established by the exchange of service messages. The text of
such service messages shall comprise:
Note 1. The provision for identification of messages
mentioned in 4.4.1.6.3 may be obtained by recording the
1) the abbreviation SVC;
heading, address and origin parts of messages.
2) the procedure signal QSP; Note 2. Provisions relating to short-term retention of
AFTN traffic records in AFTN communication centres are
3) if required, the procedure signal RQ, NO or CNL to contained in 4.4.1.7.
request, refuse or cancel a diversion;
4) identification of the routing areas, States, territories, 4.4.1.7 Short-term retention of
locations, or stations for which the diversion applies; 4.4.1.7 AFTN traffic records
5) the end-of-text signal. 4.4.1.7.1 Except as provided in 4.4.1.7.2, AFTN
communication centres shall retain, for a period of at least one
Note. The following examples illustrate application of the hour, a copy of all messages, in their entirety, retransmitted or
above-mentioned procedures: relayed by that communication centre.
1/11/01 4-6
Chapter 4 Annex 10 Aeronautical Telecommunications
4.4.1.7.2 In cases where acknowledgement is made 4.4.2.1 Heading
between AFTN communication centres, a relay centre shall be
considered as having no further responsibility for
4.4.2.1.1 The heading shall comprise:
retransmission or repetition of a message for which it has
received positive acknowledgement, and it may be deleted
a) start-of-message signal, the characters ZCZC;
from its records.
b) transmission identification comprising:
Note. Provisions relating to long-term retention of AFTN
traffic records in AFTN communication centres are contained
1) circuit identification;
in 4.4.1.6.
2) channel-sequence number.
c) additional service information (if necessary)
4.4.1.8 Test procedures on
comprising:
4.4.1.8 AFTN channels
1) one SPACE;
4.4.1.8.1 Recommendation. Test messages transmitted
on AFTN channels for the purpose of testing and repairing
2) no more than ten characters.
lines should consist of the following:
d) spacing signal.
1) the start-of-message signal;
4.4.2.1.1.1 The circuit identification shall consist of three
2) the procedure signal QJH;
letters selected and assigned by the transmitting station; the
first letter identifying the transmitting, the second letter the
3) the originator indicator; receiving end of the circuit and the third letter to identify the
channel; where there is only one channel between the
transmitting and receiving stations, channel letter A shall be
4) three page-copy lines of the sequence of characters RY
assigned; where more than one channel between stations is
in ITA-2 or U(5/5) *(2/10) in IA-5; and
provided, the channels shall be identified as A, B, C, etc. in
respective order.
5) the end-of-message signal.
4.4.2.1.1.2 Three-digit channel-sequence numbers from
001 to 000 (representing 1 000) shall be assigned sequentially
by telecommunication stations to all messages transmitted
4.4.2 Message format International
directly from one station to another. A separate series of these
Telegraph Alphabet No. 2
numbers shall be assigned for each channel and a new series
(ITA-2)
shall be started daily at 0000 hours.
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