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G3 FACSIMILE COMMUNICATIONS
• Probing (Phase 2)
The line characteristics are measured and modulation-related parameters,
such as symbol rate, are set.
Transmitter
5–78
Abbre-
Signal
viation
INFO
INFO0c Indicate modem capa-
sequence
Tone B
B
Tone B
B
Probing signal
L1
L1
Probing signal
L2
L2
Meaning
bilities, such as baud
rate and frequency
transmission function
(two frequency bands
used to measure line
characteristics), and
request adjustment.
Modem synchroniza-
tion with a 1200-Hz
tone signal.
Tone signal for analyz-
ing line characteristics
by probing.
Remarks
Transmission
speed: 600bps
The phase of the
B- signal is
inverted 180
degrees from the
phase of the B
signal.
Probing:
Measurement of
line characteris-
tics.
Tone signal in the
range 150 to
3750 Hz in 150-
Hz steps.
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