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communication centres shall retain, for a period of at least one
N o t e . 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.
Chapter 4 Annex 10 - Aeronautical Telecommunications
4.4.1.7.2 In cases where acl<nowledgement is made
between AFTN communication centres, a relay centre shall be
considered as having no further responsibility for
retransmission or repetition of a message for which it has
received positive aclinowledgement, and it may be deleted
from its records.
N o t e . Provisions relating to long-term retention of AFTN
trafic records in AFTN communication centres are contained
in 4.4.1.6.
4.4.1.8 Test procedures on
AFTN channels
4.4.1.8.1 Recommendation.- Test messages transmitted
on AFTN channels ,for the purpose of testing and repairing
lines should consist of thefollowing:
I) the start-of-message signal;
2) the procedure signal QJH;
3) the originator indicator;
4) three page-copy lines of the sequence of characters RY
in ITA-2 or U(5/5) *(2/10) in IA-5; and
5) the end-ofmessage signal.
4.4.2 Message format - International
Telegraph Alphabet No. 2
(ITA-2)
All messages, other than those prescribed in 4.4.1.8 and
4.4.9.3, shall comprise the components specified in 4.4.2.1 to
4.4.6.1 inclusive.
Note I .An illustration of the ITA-2 message ,format is
given in Figure 4-1.
Note 2 .In the subsequent Standards relative to message
,format the ,following symbols have been used in making
reference to the ,functiom assigned to certain signals in the
International Telegraph Alphabet No. 2 (see Volume 111, Part I,
8.2.1 and Table 8-1):
Symbol Signification
< CARRIAGE RETURN (signal no. 27)
--- LINE FEED (signal no. 28)
4, LETTER SHIFT jsignal no. 29)
T FIGURE SHIFT (signal no. 30)
+ SPACE (signal no. 31)
4.4.2.1 Heading
4.4.2.1.1 The heading shall comprise:
a) start-of-message signal, the characters ZCZC;
b) transmission identification comprising:
1) circuit identification;
2) channel-sequence number.
c) additional service information (if necessary)
comprising:
1) one SPACE;
2) no more than ten characters.
d) spacing signal.
4.4.2.1.1.1 The circuit identification shall consist of three
letters selected and assigned by the transmitting station; the
first letter identifying the transmitting, the second letter the
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
assigned; where more than one channel between stations is
provided, the channels shall be identified as A, B, C, etc. in
respective order.
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
directly from one station to another. A separate series of these
numbers shall be assigned for each channel and a new series
shall be started daily at 0000 hours.
4.4.2.1.1.2.1 Recommendation.- The use of the Cdigit
channel-sequence numbe4 to preclude duplication of the same
numbers during the 24-hour period, is permitted subject to
agreement between the authorities responsible ,for the
opemtion of the circuit.
4.4.2.1.1.3 The transmission identification shall be sent
over the circuit in the following sequence:
a) SPACE [+I;
b) transmitting-terminal letter;
c) receiving-terminal letter;
d) channel-identification letter;
e) FIGURE SHIFT [?I;
f) channel-sequence number (3 digits).
Annex 10 - Aeronautical Telecommunications Volume 11
Message part
' a) One SPACE
b) Transmitting-terminal letter
c) Rece~ving-terminal letter
d) Channel-Identification letter
e) One FIGURE SHlFT
. f) Channel-sequence number (3 digits)
Component of the message part
Start-of-Message S~gnal
1 Transmission Identification
(Example: NRA062)
Element of the component
-
HEADING
(see44211
Teetypewriter signal
ZCZC
(If necessary) a) One SPACE
Additional Service Indication b) NO more than 10 characters} (Examp1e:270930)
Spacing Signal
Five SPACES { One LETTER SHIFT 1
Priority Indicator 1 The relevant 2-letter group I I
Alignment Function ~ Addressee Indicatorjs)
One SPACE given in sequence
An 8-letter group 1 for each addressee
(Example: + EGLLZRZX+EDLLYKYX+EGLLACAM)
One CARRIAGE RETURN, one LINE FEED <=
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