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2) Standard procedure
Transmitter
Network interaction
( Phase 1 )
(
P3-14)
Probing/Ranging
( Phase 2 )
(
P3-15)
Equalizer/Echo
canceller training
( Phase 3 )
(
P3-16)
Final training
( Phase 4 )
(
P3-16)
Control channel
(
P3-17)
Primary channel
(
P3-18)
Image data
(
P3-18)
Communication
end procedure
(
P3-19)
Line opened
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Receiver
Line closed
The available modulation mode is in formed.
Each declares that it has V.34 capability. The
procedure moves to V.34 in the phase 2.
After the information about the modem capa-
bility is exchanged, the receiver determines
the modulation speed based on the result of
reception of the probing signal which was sent
by the transmitter.
To determine the image transmission speed,
the transmitter sends a training signal.
The optimum image transmission speed is
determined according to the training signal
received.
The pre-FAX transmission which is the same
as that for the normal T.30 is performed at
1,200 bps.
The training signal is sent with the determined
parameter, then the image data are sent.
The post-FAX transmission which is the same
as that for the normal T.30 is performed at
1,200 bps.
Line opened
3 - 13
GD-1220/1221
DIALING/COMMUNICATION CONTROL
3
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