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general definition of IS. ~t delimits a data item called a FILE.
LF - line feed- A format effector which advances the actlve
posltion to the same character position of the next line.
NAK - Negative acknowl~dge - A transmiss~on control character
transmdted by a recelver as a negatlve response to the sender.
NUL - Null - A control character used to accomplish rnedla-fill or
t~me-fillN. UL characters may be Inserted into or removed from
a stream of data w~thouat ffecting the lnformabon contmt Of
that stream, but then the addition or removal of these
characters may affect the information layout and/or the
control of equ~pment.
SI - Shlft-m - A control character whlch IS used m conjunction
w~thS HIFT-OLIT and ESCAPE to extend the graph~cc haracter
set of the code It may reinstate the standard meanlngs of the
blt comblnatlons whlch follow rt The effect of thrs character
when uslng code extenslon technlques IS descnbd In an IS0
Standard
SO - Shift-out - A control character which IS used in conjunction
wtth SHIFT-IN and ESCAPE to extend the graphic character
set of the code. It may alter the meaning of the bit
combinat~ons of columns 2 to 7 which follow it until a SHIFTIN
character is reached. However. the characters SPACE (210)
and DELETE (711 5) are unaffected by SHIFT-OUT. The effect
of this character when uslng code extenslon techniques IS
described In an IS0 Standard.
SOH - Start of heading - A transmlsslon control character used as
the first character of a heading of an informatton message.
SP - Space - A character which advances the actlve position one
character position on the same line. This character is also
regarded as a non-prlntlng graphic.
STX - Start of text- A transmlss~on control character which
precedes a text and which 13 used to termmate a heading.
SUB - Substrtuta character - A contrd character used in the place
of a character that has been found to be invalid or in error. SUB
is intended to be lntrduced by automatic means.
SYN - Synchronous ~dle- A transmiss~onc ontrol character used by
a synchronous transmiss~on system In the absmce of any
other character (idle condrt~ont)o provide a signal from which
synchronlsrn may be achieved or retained between datatermtnal
equipment.
VT - Vertical tabulation - A format effector which advances the
actwe pos~tionto the same character posrtion on the next predetermined
line.
7/11/96
No. 71 290
Part z Annex 10 - Aeronautical Telecommunications
Table 8-3. Conversion from the International Telegraph Alphabet No. 2 (ITA-2)
to the International Alphabet No. 5 (IA-5)
* No conversion shall be made for these positions and the sigMl/charactet &all be removed from
the data.
ITA-2
letter case L4 -5
of si@ No. colurnn/row
1 A 411 A
2 B 412 B
3 C 413 C
4 D 414 D
5 E 415 E
6 F 416 F
7 G 417 G
8 H 418 H
9 I 419 I
10 J 4/10 J
11 K 4/11 K
12 L 4/12 L
13 M 4/13 M
14 N 4/14 N
15 0 4/15 0
16 P 510 P
17 Q 511 Q
18 R 512 R
19 S 513 S
20 T 514 T
21 U 515 U
22 V 516 V
23 W 517 W
24 X 518 X
25 Y 519 Y
26 Z 5/10 Z
27 CR 0113 CR
28 LF 0/10 LF
29 LTRS *
30 FIGS
31 SP 210 SP
32 *
Note 1.- The end-of-mesge signal NNNN (in letter and c m ) shull convert to ETX (013).
Note 2. - The stamof-mewmge signal ZCZC (In letter and figure ca*) shall convert to SOH (O/l).
Note 3.- Figures case of SimI No. 10 shall only be converted upon detection of the AFTN
priority alarm which shall convert to five occurrence$ of BEL (017).
Note 4.- When converting from XTA-2, a STX (012) character shall be imened once at the beginning
of the next line followihg detection of CR LF or LF CR at the end of the Origin
Line.
Note 5. - The sequence of seven signal 28 (LF) shall converf to one VT (O/ll) character.
ITA-2
figure case L4 -5
of s-1 No. column/row
1 - 2/13 -
2 ? 3/15 ?
3 : 3/10 :
4 3/15 ?
5 3 313 3
6 3/15 ?
7 3/15 ?
8 3/15 ?
9 8 318 8
10 Attention signal (NOR 3) 00/ Bel
11 ( 218 (
12 219 )
13 . 2/14 .
14 , 2/12
15 9 319 6
16 0 310 0
17 1 311 1
18 4 314 4
19 ' 217 '
20 5 315 5
21 7 317 7
22 = 3/13 =
23 2 312 2
24 / 2/15 1
25 6 316 6
26 + 2/11 +
27 CR 0113 CR
28 LF 0110 LF
29 LTRS *
30 FIGS *
31 SP 210 SP
3 2 *
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume ZZZ
Table 8-4. Conversion from the International Telegraph Alphabet No. 5 (IA-5)
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