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to the International Alphabet No. 2 (ITA-2)
* No conversion shall be made for these positions and rhe Sig~l/chamctersh all be removed from
the datd.
5
4
7
8
9
10
11
12
13
14
15
Example: To find the ITA-2 signal to which the charater 3/6 of IA-5 is to be converted,
look at column 3, row 6.
25F means figure case of signal No. 25
(L = letter case, FL = either case designation).
*
*
Note 2
*
*
28FL
Note 3
*
27FL
*
*
Note 1.- The chamcfer 0/3 (ETX) shall convert to the TrA-2 sequence simals 14L. 14L, 14L, 14L (NNNN).
Note 2.- The signal 0/7 (BfiL) shall only be converted when a sequence of 5 occurrences is defected, which shall
convert to the ITA-2 sequence signals 30, 1 OF, 1 OF. IOF, 1 OF, 10F, 29.
*
*
*
*
*
*
*
*
*
L
*
Note 3.- The character sequence CR CR LF VT (O/ll)E TX (013)s hall converr to the ITA-2 sequence
signals 29, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 14L, 14L, 14L, 14L.
Note 4. - To prevent redundant genemtion of figure and letter characters in ITA-2 when convertingftorn IA-5,
no case designation shall be assigned to ITA-2 non-printing functions (signuls No. 27, 28, 29, 30, 31).
2F
2F
19F
11F
12F
2F
26F
14F
1 F
13F
24F
Note 5.- The character 0/1 (SOH) shall convert to the ITA-2 sequence s i p l s 26L, 3L. 26L, 3L (ZCZC).
7/11/96
No. 71
20F
25 F
21F
9 F
15.F
3 F
2 F
2 F
22 F
2F
2 F
5 L
6L
7L
8L
9L
10L
11L
12L
13L
14L
15L
21L
22L
23L
24L
25 L
26L
2F
2F
2F
2F
2F
5 L
6L
7L
8L
9L
1 OL
11L
12L
13L
14L
15L
21L
22L
23L
24L
25 L
26L
2F
2F
2F
2F
*
Annex 10 - Aeronautical Telecommunications
8.6.2.4.2 Characters of less than eight bits in length shall
be padded out to eight bits in length before transmission over
any octet based or bit-oriented communications network. The
padding bits shall occupy the higher order end of the octet, i.e.
bit 8, bit 7 as required, and shall have the binary values 0.
8.6.2.5 When exchanging data over CIDIN links using
bit-oriented procedures, the entry centre address, exit centre
addresses and destination addresses in the Transport and
CIDIN Packet Headers shall be in the IA-5 character set
contained in Table 8-2,
8.6.2.6 Recommendation.- When transmitting
messages in AFTN format over CIDIN links using bit-oriented
procedures, the messages should be in the IA-5 character set
contained in Table 8-2.
8.6.3 Ground-ground
character-oriented data
link control procedures
Note.-- The provisions of this section perrain to groundground
duta interchange upplications using IA-5 prescribed by
8.6.1 above and which employ the ten rransmission control
characters (SOH, SKY, Em, EOZ ENQ, ACK, DLE, NAK,
SYN, and ETB) for data link control, over synchronous or
usynchronous transmission facilities.
8.6.3.1 Descriptions. The following descriptions shall
apply to data link applications contained in this section:
a) A master station is that station which has control of
the data link at a given instant.
b) A slave station is one that has been selected to receive
a transmission from the master station.
c) A control station is the single station on a multipoint
link that is permitted to assume master status and
deliver messages to one or more individually selected
(non-control) tributary stations, or it is permitted to
assign temporary master status to any of the other
tributary stations.
8.6.3.2 MESSAGEC OMPOSITION
a) A transmission shall consist of characters from IA-5
transmitted in accordance with 8.6.1.2.2 above and
shall be either an information message or a supervisory
sequence.
b) An information message used for the exchange of data
shall take one of the following forms:
B
Note 1.- C is a block check character (BCC).
C
Note 2.- In formats 2). 4). and 5) above which
end with ETB, some continuation is required.
c) A supervisory sequence shall be composed of either a
single transmission control character @OT, ENQ,
ACK, or NAK) or a single transmission control (ENQ)
preceded by a prefix of up to 15 non-control
characters, or the character DLE used in conjunction
　
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