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4.4.1.2.1 The order of priority for the transmission of
N o t e . The expression "reasonable period" means a messages in the aeronautical fixed telecommunication network
shall be as follows: period of time such that it seems probable that the t@c will
not he delivered to the addressee within any fuced transit
Transmission Priority
priority indicator
period applicable to the category of trufic concerned, or;
alternatively, any predetermined period agreed between
originators and the telecommunication station concerned.
1 SS
2 DD FF 4.4.1.4 Supervision of message trufic
3 GG KK
4.4.1.4.1 Continuity of message truffic. The receiving
4.4.1.2.2 Recommendation.- Messages having the station shall check the transmission identification of incoming
same priority indicator should he transmitted in the order in transmissions to ensure the correct sequence of channelwhich
thq are received,for transmission. sequence numbers of all messages received over that channel.
Chapter I Annex 10 - Aeronautical Telecommunications
4.4.1.4.1.1 When the receiving station detects that one or
more channel-sequence numbers are missing, it shall send a
complete service message (see 4.4.1.1.9) to the previous
station rejecting receipt of any message that may have been
transmitted with such missing number(s). The text of this
service message shall comprise the signal QTA, the procedure
signal MIS followed by one or more missing transmission
identification (see 4.4.2.1.1.3 and 4.4.15.1.1.4) and the endof-
text signal (see 4.4.5.6 and 4.4.15.3.12).
N o t e . The,following examples illustrate application of the
above-mentioned procedure. In example 2) the hyphen (-)
separator is understood to mean "through" in plain language.
I) when one channel-sequence number is missing:
2) when several channel-sequence numbers are missing:
4.4.1.4.2 Misrouted messages
N o t e . A message is considered to have been misrouted
when it contains no relaying instructions, expressed or
implied, on which the receiving station can take action.
4.4.1.4.2.1 When the receiving station detects that a
message has been misrouted to it, it shall either:
1) send a service message (see 4.4.1.1.9) to the previous
station rejecting receipt of the misrouted message; or
2) itself assume responsibility for transmission of the
message to all addressee indicators.
N o t e . The procedure of I ) is preferable at stations using
"torn-tape" relay methodLs or a semi-automatic relay
technique with continuous tape. The procedure of 2) may be
preferred at stations using,fully automatic relay methods or a
semi-automatic relay technique without continuous tape.
4.4.1.4.1.1.1 When the provisions of 4.4.1.4.1.1 are 4.4.1.4.2.2 When the provisions of 4.4.1.4.2.1, 1) are
applied, the station notified of the missing message(s) applied, the text of the service message shall comprise the
condition by the service message shall reassume its abbreviation SVC, the signal QTA, the procedure signal MSR
responsibility for transmission of the message (or messages) followed by the transmission identification (see 4.4.2.1.1.3 and
4.4.15.1.1.4) of the misrouted message and the end-of-text
that it had previously transmitted with the transmission
identification concerned. and shall retransmit that messag-e (or signal (see 4.4.5.6 and 4.4.15.3.12). \
those messages) with a new (correct in sequence) transmission
identification. The receiving station shall synchronize such that N o t e . The,following example illustmtes application of the
the next expected channel-sequence number is the last received above-mentioned procedure:
channel-sequence number plus one.
4.4.1.4.1.2 Recommendation.- When the receiving
station detects that a message has a channel sequence number 4.4.1.4.2.3 When, as a result of the provisions of
less than that expected, it should advise the previouLs station 4.4.1.4.2.2, a sending station is notified of the misrouted
message condition by service message, it shall reassume its
using a service message with a text comprising:
responsibility for the message and shall retransmit as
I) the abbreviation SVC;
2) the procedure signal LR ,followed by the transmission
identtfication of the received message;
3) the procedure signal EXP followed by the transmission
identtfication expected;
4) the end-oftext signal.
N o t e . The,following example illustrates application of the
above-mentioned procedure:
necessary on the correct outgoing channel or channels
4.4.1.4.3 When a circuit becomes interrupted and
alternative facilities exist, the last channel-sequence numbers
sent and received shall be exchanged between the stations
　
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