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Fig 15-3
00
1
>
2
90°
2
+»
3
3.»
4
4
>
4 1
01
1
+»
4
0°
2
-»
2
3.»
3
4.4
4
11
1
+
4
270°
2
+
1
3
»
2
4
.,
3
10
1
>
3
180°
2
>»
4
3
+»
1
4.»
2
Phase quadrant 2
Phase quadrant 1
e
e
__t
e
e
11
01
10
11
e
e
e
e
10
oo
00
01
|
|
|
|
|
|
|
|
|
|
e
e
e
e
01
00
00
10
e
e
e
e
11
10
|
01
1
Phase quadrant 3
Phase quadrant 4
Fig 15-4
1200 bit/s data signaling rate: The data flow is divided into
groups of two bits (dibits). Each group defines in turn a phase
quadrant change, relative to the quadrant occupied by the
previous signal element (see FIG 5). Regardless of which of the
phase quadrants of FIG 6 you are in, the signal element 01 is
sent. Thus V.22 bis at 1200 bit/s is compatible with V.22.
ITU-T V.23:
Specifies half duplex transmission at 1200 bits/s or split speed
full duplex with 75 bits/s in one direction, 1200 bits/s in the
opposite.
LZTR104006 R1.00
Zatt4.4/1 4.4-7 and 19.2/19.2-7
15-9
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