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in the process of retransmission in accordance with the
provisions of 4.4.6.1 c).
4.4.10.1.5 When oossible in "tom-tave" or semiautomatic
installations, a correct tape shall be obtained prior to
onward relay; when tape is illegible or mutilated the station
shall not relay the message unless good judgement indicates
that this is not lilcely to result in malfunctioning of equipment
at subsequent relay stations.
4.4.10.1.6 Acknowledgement of receipt of messages. In
teletypewriter operation and except as provided in 4.4.10.1.6.1,
a receiving station shall not transmit acl<nowledgement of
receipt of incoming messages. In lieu thereof the provisions of
4.4.1.4.1 shall be applied.
4.4.10.1.6.1 The receipt of distress messages (priority SS
- see 4.4.1 .l. 1) shall be individually acknowledged by the
AFTN destination station sending a service message (see
4.4.1.1.9) to the AFTN origin station. Such aclcnowledgement
of receipt shall take the format of a complete message
addressed to the AFTN origin station, shall be assigned
priority indicator SS and the associated priority alarm (see
4.4.4.3) and shall have a text comprising:
1) the procedure signal R;
2) the origin (see 4.4.4), without priority alarm, or optional
heading information of the message being
aclcnowledged;
3) the end-of-text signal [J<=].
Annex 10 - Aeronautical Telecommunications Volume I1
N o t e . The,following example illustrates the application of
4.4.10.1.6.1 procedure:
Heading (see 4.4.2.1.1)
<=SS+LECBZRZXe
1'12 1322J+ EGLLYFYX (Priority Alarm) <=
~+1'1213 1 ~J+LECBZRZX~=
Ending (see 4.4.6)
4.4.10.1.7 In cases where an addressee of a multi-address
message requests a repetition of the message from the origin
station, the origin station shall address the repeat of the
message only to the addressee requesting the repeat. Under
these conditions the procedure signal DUPE shall not be
included.
4.4.11 Action on mutilated or improperly
formatted messages detected in
teletypewriter relay stations
4.4.11.1 If, before retransmission is commenced, a relay
station detects that a message has been mutilated or
improperly formatted at some point ahead of the
end-of-message signal, and it has reason to believe that this
mutilation had occurred before the message had been received
by the previous station, it shall send a service message
(see 4.4.1.1.9) to the originator as identified by the originator
indicator in the origin of the mutilated or improperly formatted
message, requesting repetition of the incorrectly received
message.
Note I .Th e,following example illustrates a typical text of
a service message in which the ,foregoing procedure has been
applied in respect of a mutilated message having as its origin
"141335 CYULACAX:
Note 2 .Th is circumstance of detection of a mutilation
may only be possible at "torn-tape" relay stations.
4.4.11.2 When the provisions of 4.4.11.1 are applied, the
originator as identified by the originator indicator in the origin
of the mutilated message shall reassume responsibility for the
mutilated message, and shall comply with the provisions of
4.4.11.3.
4.4.11.3 Following application of the provisions of
4.4.11.2, the following reprocessing shall be accomplished
before the unmutilated version of the message is transmitted
for the second time towards the same addressee or addressees:
1) insert a new heading;
2) remove the ending of the message (see 4.4.6.1);
3) insert in lieu thereof the procedure signal DUPE,
preceded by at least 1 LETTER SHIFT [J] and
followed by 1 CARRIAGE RETURN, 8 LINE
FEEDS, end-of-message signal and, if necessary
(see 4.4.6 and 4.4.7), the LETTER SHIFTS [J] of the
message-separation signal and tape feed.
N o t e . The example appearing in Figure 4-3 illustrates the
application of this procedure.
4.4.1 1.4 If, before retransmission is commenced, a relay
station detects that one or more messages have been mutilated
at some point ahead of the end-of-message signal, and it has
reason to believe that this mutilation had occurred during or
subsequent to its transmission from the previous station, it
shall send a service message (see 4.4.1.1.9) to the previous
station rejecting the mutilated transmission and requesting a
repetition of the incorrectly received message (or messages).
Note I .Th e ,following examples illustrate application of
the above-mentioned procedure. In example 2) the hyphen (-)
separator is understood to mean "through " in plain language.
I) in respect of a single mutilated message.
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