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by DCS. Delaying the transmission speed in this way when a communica-
tions error has occurred at the current transmission speed is called "fall-
back." When FTT is returned (when TCF cannot be successfully received)
even if fallback is repeated, the transmitting side judges that communica-
tions is not possible on the current line, and the communications ends in
error.
Calling Side (transmitter)
Dial
At FTT
Line disconnected
G3 FACSIMILE COMMUNICATIONS
CNG
CNG
CED
DIS
DIS
DCS
Training
TCF
FTT
(CFR)
Training
At CFR
Message
RTC
EOP
MCF
DCN
Fig. 5-75 Training
1
2
Called Side (receiver)
3
Call
Response
4
5
6
ït
çi
Line disconnected
5–103
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