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4.4.9.3.2 If a periodic channel checlc transmission is not
received within a tolerance agreed for that channel, a station
shall send a service message to the station from which the
transmission was expected. The text of this service message
shall comprise:
1) the abbreviation SVC;
2) the procedure signal MIS;
3) the procedure signal CH;
4) (optionally) the time at which the transmission was
expected;
5) the procedure signal LR;
4.4.9.1.1 A single line of page-copy shall not contain
more than a total of 69 characters andlor spaces.
4.4.9.1.2 One CARRIAGE RETURN [<I and one LINE
FEED IMPULSES [=I shall be transmitted between each
printed page-line of the text of a message.
4.4.9.2 Duration of transmissions. For simplex circuits,
the transmission of a series of messages in a single
transmission shall not continue for longer than approximately
6) the transmission identification of the last message
received;
7) the end-of-text signal.
N o t e . The,following example illustrates application of the
above-mentioned procedure:
Annex 10 - Aeronautical Telecommunications Volume I1
4.4.9.3.3 When a teletypewriter channel is equipped with
a system of controlled circuit protocol, and following
agreement between the Administrations responsible, the
transmission specified in 4.4.9.3 shall not be made.
4.4.9.3.4 Channel-check transmissions and station radio
identifications. In order to satisfy the requirements of ITU
regarding periodic transmission of the station radio identification,
those AFTN stations using radioteletypewriter
channels may combine the station radio identification
transmission with the channel-check transmission specified in
4.4.9.3. In this case the combined transmission shall be sent as
follows:
1) heading ( ~ e e4. 4.2.1.1);
2) alignment function [<=I;
3) the procedure signal CH;
4) alignment function [<=I;
5) the procedure signal DE followed by one SPACE [+]
and the assigned ITU radio call sign;
6) alignment function [<=I;
7) end-of-message signal [NNNN];
8) message-separation signal [ I(if
required).
N o t e . Application of this format will permit this special
transmission to he handled by ,fully automatic switching
centres without the intervention of supervisory personnel.
4.4.9.3.4.1 Recommendation.- m e n multichannel
radioteletypewriter circuits are used (e.g. MET and AFTN) the
station radio call sign transmission should he sent on only one
channel of the circuit. The channel chosen should be the one
which is the most convenient ,for this purpose with the
identification transmission being sent in conformance with the
format used on that channel. When an AFTNchannel is chosen
the identification transmission should he combined with the
channel-check transmission.
4.4.9.3.5 When a teletypewriter circuit is associated with
Automatic Error Correction (ARQ) equipment, and following
agreement between the Administrations responsible, the
transmissions specified in 4.4.9.3 need not be made: however
stations employing radioteletypewriter channels on the AFTN
for which the station radio identification is required, shall
comply with the provisions of 4.4.9.3.4.
N o t e . The foregoing is not to he interpreted as implying
any ICAO requirement necessitating the installation of
Automatic Error Correction (ARQ) equipment on international
aeronautical ,fixed circuits.
4.4.10 Normal teletypewriter
transmission procedures
4.4.10.1 Messages shall be transmitted in accordance with
predetermined responsibility for onward relay as agreed
between the Administrations responsible for the operation of
directly connected stations (see also 4.4.1.3 and 4.4.1 S.2.3).
4.4.10.1.1 Arising from the responsibility agreements
established under the provisions of 4.4.10.1, each station of the
AFTN shall employ and, subject to the provisions of
4.4.10.1.1 .l, adhere to a Routing Directory which consists of
the Routing List.
4.4.10.1.1.1 When an incoming message contains only
identical location indicators in the lines-following-the-heading
the receiving station shall accept responsibility for further
relay. If possible such relay shall be effected on the normal
outgoing circuit to the place of destination of the message; if
it is not possible to use the normal circuit, an appropriate
alternative outgoing circuit shall be used. When neither of
these facilities is in operation, the message shall not be
retransmitted over the circuit from which it was received,
without prior service message (see 4.4.1.1.9) notification of
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