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• Control channel
The conventional T.30 protocol is executed.
The transmission speed is 600bps.
Transmitter
Abbre-
Signal
viation
Flag
flags
Non-standard
NSS
facilities set-
up
Transmitting
subscriber
identification
Digital com-
DCS
mand signal
—
Receiver
Abbre-
Signal
viation
Non-standard
NSF
facilities
Called sub-
scriber identi-
fication
Digital identi-
DIS
fication signal
Flag
flags
Confirmation
CFR
to receive
G3 FACSIMILE COMMUNICATIONS
Meaning
Maintain synchroniza-
tion.
Receive NSF from the
other party, select an
available mode from it,
and instruct reception.
TSI
Report the transmitter
telephone number.
Instruct the available
mode.
1
Declare to switch to
high-speed protocol.
Meaning
Report functions not
recommended by
T, user's ID, manufac-
turer code, etc.
CSI
Report the receiver
telephone number.
Report standard ITU-T-
recommended func-
tions.
Maintain synchroniza-
tion.
Report that modem
training ends and
image signal reception
is ready.
Remarks
7E (H)
Transmit 1's.
Remarks
ITU-
7E (H)
5–81
1
2
3
4
5
6
ït
çi
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