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ITU-T V.22 bis
Handshake sequence at 1200 bit
Fig15-6:shows a sequence where answering modem cannot
transmit 2400 bit/s. This sequence is identical to V.22
connection, except for the S1 sequence.
Call mode modem
V.22 bis
$1
Scrambled binary 1
Data
Connect to line
at 1200 bit/s
>
456ms | 100 ms
765ms +10 ms
110ms
13ms
|#———
|¢——>
[106
Delect scrambled
106
binary 1 an 270+40ms
Detect unscrambled
109
binary 1 in 155110 ms
107
104 clamp lo
194 unelam
binary
1
Answer mode modem
~
(onary 1 ) _ J
Data
Connect
to line
2100 Hz
Unscrambled binary 1
Scrambled binary 1
Data
for 3300
at 1200 bit/s
at 1200 bis
+350 ms
Detecl scrambled
106
407
binary 1 or binary 0
in 270 + 40 ms
Silence
2150ms +350 ms
109
V.22 bis signal
$1=Unscrabled souble dibit 00
104 clamped , 104 unclam,
and 11 at 1200 bit/s for 100 43ms
to binary 1
|
(onary i) [Data
Fig. 15-6
LZTR104006 R1.00
15-11
Zatt4.4/14.4-7 and 19.2/19.2-7
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