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Note I .To avoid co$!ict with the AFTN start-of
message signal, combinations with ZC or CZ will not be
used.
Note 2 .To avoid conflict with the AFTN end-of
message signal, combinations with NN will not he used.
4.4.14.3 PANS.- Predetermined Distribution Addressee
Indicators (PDAIs) should be used whenever possible on
AFTN messages between States which have agreed to make
use of the predetermined distribution system.
4.4.14.4 AFTN messages carrying Predetermined
Distribution Addressee Indicators allocated by the State
receiving the message shall be routed to the addressees listed
on the associated list of Addressee Indicators described in
4.4.14.5.
4.4.14.5 States shall send their list of selected
Predetermined Distribution Addressee Indicators together with
the associated lists of Addressee Indicators to:
a) the States from which they will receive AFTN messages
for predetermined distribution, to assure correct routing;
and
b) the States which will originate AFTN messages for
predetermined distribution to facilitate the treatment of
requests for retransmission and to assist originators in
using the Predetermined Distribution Addressee
Indicators correctly.
4.4.14.5.1 The list of Addressee Indicators associated
with a Predetermined Distribution Addressee Indicator shall
include either:
a) Addressee Indicators for national distribution; or
b) Addressee Indicators for international distribution; or
c) Predetermined Distribution Addressee Indicators for
international distribution; or
d) any combination of a), b) and c).
Chapter I Annex 10 - Aeronautical Telecommunications
4.4.15 Message format - International
Alphabet No. 5 (IA-5)
When it has been agreed between the Administrations
concerned to use International Alphabet No. 5 (IA-5) the
format described in 4.4.15 through 4.4.15.3 shall be used. It
shall be the responsibility of Administrations using IA-5 to
accommodate adjacent AFTN stations employing ITA-2 code
in the format described in 4.4.2.
All messages, other than those prescribed in 4.4.1.8 and
4.4.9.3 shall comprise the components specified in 4.4.15.1 to
4.4.15.6 inclusive.
Note I .An illustration of the IA-5 message ,format is
given in Figure 4-4.
Note 2 .In the subsequent standard.^ relative to message
,format the ,following symbols have been used in making
reference to the,functions assigned to certain signals in IA-5.
(See Volume 111, Part I, 8.6.1 and Tables 8-2 and 8-3.)
Symbol Signification
< CARRIAGE RETURN (character position
0113)
-- LINE FEED (character position 0110)
+ SPACE (character position 210).
4.4.15.1 Heading
4.4.15.1.1 The heading shall comprise:
a) start-of-heading (SOH) character 011;
b) transmission identification comprising:
1) circuit or link identification;
2) channel-sequence number;
c) additional service information (if necessary) comprising:
1) one SPACE;
2) no more than 10 characters.
4.4.15.1.1.1 On point-to-point circuits or links, the 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 the channel. Where only one channel exists,
the 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. On multipoint channels,
the identification shall consist of three letters selected and
assigned by the circuit control or master station.
4.4.15.1.1.2 Except as provided in 4.4.15.1.1.3 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.
4.4.15.1.1.3 Recommendation.- The expansion of the
channel-sequence number to preclude duplication of the same
numbers during the 24-hour period should he permitted
subject to agreement between the Authorities responsible ,for
the operation of the circuit.
4.4.15.1.1.4 The transmission identification shall be sent
over the circuit in the following sequence:
a) transmitting-terminal letter;
b) receiving-terminal letter;
c) channel-identification letter;
d) channel-sequence number.
4.4.15.1.1.5 Additional service information shall be
permitted to be inserted following the transmission
identification subject to agreement between the Authorities
　
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