International Telegraphy Alphabet No.5

Symbol No. Emitted signal ITA5 character Symbol No. Emitted signal ITA5 character Symbol No. Emitted signal ITA5 character
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
BBBBBBB
YBBBBBB
BYBBBBB
YYBBBBB
BBYBBBB
YBYBBBB
BYYBBBB
YYYBBBB
BBBYBBB
YBBYBBB
BYBYBBB
YYBYBBB
BBYYBBB
YBYYBBB
BYYYBBB
YYYYBBB
BBBBYBB
YBBBYBB
BYBBYBB
YYBBYBB
BBYBYBB
YBYBYBB
BYYBYBB
YYYBYBB
BBBYYBB
YBBYYBB
BYBYYBB
YYBYYBB
BBYYYBB
YBYYYBB
BYYYYBB
YYYYYBB
BBBBBYB
YBBBBYB
BYBBBYB
YYBBBYB
BBYBBYB
YBYBBYB
BYYBBYB
YYYBBYB
BBBYBYB
YBBYBYB
BYBYBYB
NUL
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF
VT
FF
CR
SO
SI
CLE
DC1
DC2
DC3
DC4
NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS
US
SP
!
"
#
$
%
&
'
(
)
*
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
YYBYBYB
BBYYBYB
YBYYBYB
BYYYBYB
YYYYBYB
BBBBYYB
YBBBYYB
BYBBYYB
YYBBYYB
BBYBYYB
YBYBYYB
BYYBYYB
YYYBYYB
BBBYYYB
YBBYYYB
BYBYYYB
YYBYYYB
BBYYYYB
YBYYYYB
BYYYYYB
YYYYYYB
BBBBBBY
YBBBBBY
BYBBBBY
YYBBBBY
BBYBBBY
YBYBBBY
BYYBBBY
YYYBBBY
BBBYBBY
YBBYBBY
BYBYBBY
YYBYBBY
BBYYBBY
YBYYBBY
BYYYBBY
YYYYBBY
BBBBYBY
YBBBYBY
BYBBYBY
YYBBYBY
BBYBYBY
YBYBYBY
+
,
-
.
/
0
1
2
3
4
5
6
7
8
9
:
;
<
=
>
?
 
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
BYYBYBY
YYYBYBY
BBBYYBY
YBBYYBY
BYBYYBY
YYBYYBY
BBYYYBY
YBYYYBY
BYYYYBY
YYYYYBY
BBBBBYY
YBBBBYY
BYBBBYY
YYBBBYY
BBYBBYY
YBYBBYY
BYYBBYY
YYYBBYY
BBBYBYY
YBBYBYY
BYBYBYY
YYBYBYY
BBYYBYY
YBYYBYY
BYYYBYY
YYYYBYY
BBBBYYY
YBBBYYY
BYBBYYY
YYBBYYY
BBYBYYY
YBYBYYY
BYYBYYY
YYYBYYY
BBBYYYY
YBBYYYY
BYBYYYY
YYBYYYY
BBYYYYY
YBYYYYY
BYYYYYY
YYYYYYY
V
W
X
Y
Z
 
 
 
 
_

a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
 
 
 
 
DEL
The characters of the ITA-5 alphabet are composed of 7 information carrying units, providing 128 combinations. This code is equal to the ASCII-code
The number of the symnbol is written binary. Thus 1 = Y = Mark and 0 = B = space.
The elements are read out from right to left during transmission
For example:
The letter D had symbol-number 68. Binary that is 1000100=YBBBYBB
Putting the elements in order of transmission the combination changed into 0010001 = BBYBBBY
Usually this code is used for data-communication purposes
Many American teleprinters were designed for communication with 8 data bits (of which 1 bit often had no meaning), and were preceded by a start-element en followed by 1 or 2 stop-elements.
Data transmissions used 600 bits/s or 1200 bits/s. When this transmission had to take place through HF channels, Multi-channel Voice Frequency telegraph systems could be used. In that case the bits were diveded over the 6 or 12 channels of the sytem resulting in a 100 baud/s channelspeed (from serial to parallel per 6 or 12 bits).
At the same time a synchronisation signal is included so the bits are placed in the right order at the receiving site.
Trying to decode one channel is impossible because of the succeeding elements always 5 or 11 bits are missing since they are transmitted via the other channels.
This code is also known as ISO-7 bit code.
 
7
0
0
0
0
1
1
1
1
6
0
0
1
1
0
0
1
1
5
0
1
0
1
0
1
0
1
4
3
2
1
 
0
2
2
3
4
5
6
7
0
0
0
0
0
NUL
DLE
Spc
0
@
P
 
p
0
0
0
1
1
SOH
DC1
!
1
A
Q
a
q
0
0
1
0
2
STX
DC2
"
2
B
R
b
r
0
0
1
1
3
ETX
DC3
£
3
C
S
c
s
0
1
0
0
4
EOT
DC4
$
4
D
T
d
t
0
1
0
1
5
ENQ
NAK
%
5
E
U
e
u
0
1
1
0
6
ACK
SYN
&
6
F
V
f
v
0
1
1
1
7
BEL
ETB
'
7
G
W
g
w
1
0
0
0
8
BS
CAN
(
8
H
X
h
x
1
0
0
1
9
HT
EM
)
9
I
Y
i
y
1
1
1
0
A
LF
SUB
*
:
J
Z
j
z
1
0
1
1
B
VT
ESC
+
;
K
[
k
{
1
1
0
0
C
FF
FS
,
<
L
\
l
 
1
1
0
1
D
CR
GS
-
=
M
]
m
}
1
1
1
0
E
SO
RS
.
>
N
^
n
 
1
1
1
1
F
SI
US
/
 
O
_
o
DEL