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(2) Typical protocol
Network interaction
(Phase 1)
Probing
(Phase 2)
Primary channel
equalizer training
(Phase 3)
Control channel
start-up
(Phase 4)
Control channel
Primary channel
resyncronization
procedure
Image data
Control channel
resyncronization
procedure
(Communication end
procedure)
Line released
G3 FACSIMILE COMMUNICATIONS
TX
RX
CNG
Connected to the line
ANSam
CM
JM
CJ
INFO0c
INFO0a
A
B
A
B
L1
L2
A
B
INFO0h
S
S
PP
TRN
PPh
PPh
ALT
ALT
MPh
MPh
MPh
MPh
E
E
NSF
CSI
flags
DIS
NSS
TSI
flags
DCS
flags
CFR
flags
"1"
S
S
PP
B1
Image
data
Turn-Off
Sh
Sh
Sh
Sh
ALT
ALT
E
E
PPS-EOP
flags
MCF
flags
flags
DCN
"1"
Line released
Fig. 5-59 Typical Protocol
Declares the usable modulation
mode.
V.8
Declares that V.34 capability exists
on each machine, and transfers the
V.34 procedures with phase 2.
After declaring the modem's
modulation speed capacity, etc. to
each machine, the receiving side
determines the modulation speed
based on the results of an probing
signal output by the transmitting
side.
The transmitting side outputs a
training signal to determine the
image transmission speed.
The optimum image transfer speed
is determined by the condition in
which the training signal is received.
The pre-message protocol is done
V.34
in the same way as a normal T.30,
at 1200bps.
The training signal is output with the
determined parameters, and
continues to transmit the image
data.
The post-message protocol is done
in the same way as a normal T.30,
at 1200bps.
1
2
3
4
5
6
ït
çi
5–75
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