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used for messages using IA-5 code.
4.4.15.5 Channel-clzeck transnzissions. In the case where
continuous coni~ol of cllontlel condition is not provided the
following periodic triil~smissions shall he sent on tektypewriter
circuits:
I) heading line (see 4.4.15.1.1);
2) alignmenl function T;
X
3) the procedure signal CH;
E
Note.- The charncrer count includes all printing and non- 4) alignment function T.
printirzg rharact~rs in zhe re-xt .from, hlit not irzcludil~g. the X
start-of-tc-rt signul tn, but not incl~rdin5 tlze first alignment
fiinctiorl of the ending. The receiving station shall then check the transmission
idcniification of this incoming transnlission to ensure its
conect scquence in respcct of all messages received over illat
4.4.15.3.12 Ending incoming channel.
4.4.15.3.12.1 The ending of a message shall comprise the
following in the order stated:
a) an alignment [<=I function following the last line of
text;
b) page-fcd character, character Oil1 (VT);
c) end-of-tcxt character 013 (ETX).
4.4.15.1.12.1.1 Kecommcndation.- Siatiori ten7rinal
equiprmnt (page printers) on thc Internntiorzul Alpiznbet
Nirnlher 5 (IA-5) &all bc provirled wit17 n cr~pubiliv to
generutrr suflciertt line feed finctions jor local sration use
lfporr the r~ceptio~ofz a URTICAL TAB character (O/11).
4.4.15.3.12.1.2 Recommendation.- Cl'l~en the nzessage
does riot transit ITA-2 portions of the AFTN, or hare
Adrrzinistrntiorzs lza~vm ade provisiorts to add azrto~nnticallyt he
Note.- Applicatiorz of this procedure provides sorne
nzeusr~re of asslircznce that chnr~nel cor~tinuity is mair~tairied:
I.lo~vever;L I co~ztin~~ouscloyn rn~lled cltunnel is nrtich more
pref~rablc in tthnt data inlc,yri@ can also be improvrd
4.4.15 5.1 Recommendation.- \17htrr. u circurt rs
unoccup~ed and rrricor~trolled, the rmn\~nissrorz idenrlfied r j z
4.4.15.5 sho~ild be sent at Ii -t 00, H t 20, H + 40.
4.4.15.6 The receipt of distress messagcs (priority
indicator SS, see 4.4.1.1.1) shall be individually acknowledged
by lhe AFTN destination station by sunding a service message
(sre 4.4.1.1.9) to the MTN origin station. Such acknowledgement
of receipt shall take tlic format of a complete
message addressed lo the At;TN o~igin station, shall be
assigned priority iiidicator SS md the associal.cd plionty alarm
(SEC 4.4.15~2.1.5). and shall have a text comprising:
1) the procedtrre signal R;
27/11/03
No. 78
2) the origin line (seo 4.4.15.2.21 witliout priority alarm, or
optional heading information oS the message bcing
:~cknowledgcd:
3) the ending (see 4.4.15.3.12.1 ).
Hcading (see 4.3.15.1.1 )
171312 + ECLLYFYX (Priority Alann) <a
s
Ending (see 4.4.15.3.12.1)
Nole.- Tliefollo~r~inegra nrp/e illitstmies a gpicirl tt,rt r f l r
.rcrcice nlt..sscige in wllich tlre ,foregorng pmceil~ire lrus been
appliecl hr I-erpect (?fa nlrlfilated mes.scrge having 0s its orignl
''141.?35 CYliLd1CA.Y":
SVC->QTA-)KPT-+ 14 1 335+CYULA4CAX
(.aiding - see 4.4.15.3.1 2.1)
4.4.16.3 If. aflcr transmission ol the tcst matcrial of a
message, a rclay slation can detect that therc is no complete
cnd-of-tcxt character, but has no practical rncans of
discovering whether the irregularity has affected only ihe
end-or-text charactcr, or whether it has also caused part of the
original text to have been lost, it shall insert into thc channel
thc following:
2) its own station identification;
4.4.16 Action taken on mutilated 3) (enrting - ste 4.4.15.3.12.1).
lnessages in 1A-5 detectcd in
compulerized :tFTN relay stations
4.4.17 Transfer of AlTN messages over code
4.4.16.1 On chatincls ernploying continuous control the and byte independent circcuits and networks
nu ti la ti on detection and subsequent recovery shall be a
hlnction of tl,c link control and shall not require Whcn AFTN tnussages are transferred across code and hytc
[hc su,,scquent ,,f service or CHECK TEXT NEW indcpendcnt circuits and ne.tworks of the AFS, the follow in^
ESDTNC ADDED Incssages. shall apply.
4.4.16.2 Cln c11;innels not employing conlin~~orc~onst rol
the rclay station shall enlploy tlie following procedures:
4.4.16.2.1 IS. during the reception of a message a relay
station detects that thc message has been mutilated at somc
point ahead ol the cnd-of-tcxt character, it shall:
1) canccl the onward routing responsibility for the
message;
2) scnd a service message to the transmitting station
requcscing a retransmission.
More.- Tlre,follo+~ietvrr~u nplc. illrrs:rares o r!~?iallt ~ rotf a
sen,icc nlcssagc i l l \vhii:h thc foregnirip proredlire has hec~z
　
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