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service message in which the ,foregoing procedure has been
applied in respect of a mutilated message having as its origin
"141335 CYULACAX":
SVC+QTA+RPT+ 14 13 3 5+CYULACAX
(ending - see 4.4.15.3.12.1)
4.4.16.3 If, after transmission of the text material of a
message, a relay station can detect that there is no complete
end-of-text character, but has no practical means of
discovering whether the irregularity has affected only the
end-of-text character, or whether it has also caused part of the
original text to have been lost, it shall insert into the channel
the following:
2) its own station identification;
4.4.16 Action taken on mutilated 3) (ending- see 4.4.15.3.12.1).
messages in IA-5 detected in
computerized AFTN relay stations
4.4.17 Transfer of AFTN messages over code
4.4.16.1 On channels employing continuous control the and byte independent circuits and networlts
mutilation detection and subsequent recovery shall be a
function of the lid' control procedures and shall not require When AFTN messages are transferred code and byte
the subsequent sending of service or CHECK TEXT NEW independent circuits and networlcs of the AFS, the following
ENDING ADDED messages. shall apply.
4.4.16.2 On channels not employing continuous control 4.4.17.1 Except as provided in 4.4.17.3 the heading line
the relay station shall employ the following procedures: of the message shall be omitted. The message shall start with
an alignment function followed by the address.
4.4.16.2.1 If, during the reception of a message a relay
station detects that the message has been mutilated at some 4.4.17.2 The message shall end with a complete ending.
point ahead of the end-of-text character, it shall:
1) cancel the onward routing responsibility for the
message;
2) send a service message to the transmitting station
requesting a retransmission.
N o t e . The,following example illustrates a typical text of a
service message in which the ,foregoing procedure has been
applied in respect of a mutilated message:
SVC+QTA+RPT+ABC 123 (ending - see 4.4.15.3.12.1)
4.4.16.2.2 When the provisions of 4.4.16.2.1 are applied,
the station receiving the service message shall reassume
responsibility for the referenced message with a new (i.e.
correct in sequence) transmission identification (see
4.4.15.2.1). If that station is not in possession of an
unmutilated copy of the original message, it shall send a
message to the originator as identified by the originator
indicator in the origin of the mutilated message, requesting
repetition of the incorrectly received message.
4.4.17.3 Recommendation.- For the purposes of
technical supervision, entry centres should be permitted to
insert additional data preceding the first alignment function
and/or,following the ending of the message. Such data may be
disregarded by the receiving station.
4.4.17.3.1 When the provisions of 4.4.17.3 are applied,
the data added shall not include either carriage return or line
feed characters or any of the combinations listed in 4.1.2.4.
4.5 Common ICAO Data Interchange Network
(CIDIN)
Note I . The common ICAO data interchange network
(CIDIN), which comprises application entities and communication
services ,for ground-ground message exchange, makes
use of protocols based on the International Telegraph and
Telephone Consultative Committee (CCITT) X25 Recommendation
to provide code and byte-independent communication
,facilities.
Chapter 4 Annex 10 - Aeronautical Telecommunications
Note 2.- The principal goals of the CIDIN are to improve
the AFTN and to support large message transmission and more
demanding applications, such as operational meteorological
information (OPMET), between two or multiple ground
systems.
Note 3.- Details of CIDIN communication procedures, as
implemented in Europe, are shown in the EUR CIDIN Manual
4.6 ATS Message Handling
Services (ATSMHS)
The ATS message service of the ATS (air traffic services)
message handling service (ATSMHS) application shall be used
to exchange ATS messages between users over the
aeronautical telecommunication network (ATN) internet.
Note I .Th e ATS message service comprised in the ATS
message handling service application aims at providing generic
message services over the ATN internet communication service
(ICS). It may, in turn, he used as a communication system hy
user-applications communicating over the ATN. This may be
achieved, for example, by means of application programme
interfaces to the ATS message service.
Note 2.- The detailed spectfication of the ATS message
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