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FAX-L350 Chapter 2: Technical Reference
b-2) Probing (Phase 2)
The line characteristics are measured and modulation-related parameters, such as symbol rate, are set.
• Transmitter
Signal
INFO sequence
Tone B
Tone B
Probing signal L1
Probing signal L2
Abbreviation
INFO0c
B
B
L1
L2
Meaning
Indicate modem capabilities,
such as baud rate and fre-
quency transmission function
(two frequency bands used to
measure line characteristics),
and request adjustment.
Modem synchronization with
a 1200-Hz tone signal.
Tone signal for analyzing 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 characteristics.
Tone signal in the
range 150 to 3750 Hz
in 150-Hz steps.
• Receiver
Signal
INFO sequence
Tone A
Tone A
INFO sequence
Abbreviation
INFO0a
A
A
INFO0H
Meaning
Report the modem capa-
bilities, such as baud rate and
frequency transmission ability.
Modem synchronization with
a 2400-Hz tone signal.
Report the pre-emphasis filter
and baud rate used for data
transmission based on the
result of analysis of the
probing signal.
Remarks
Transmission speed:
600bps
The phase of the A-
signal is inverted 180
degrees from the phase
of the A signal.
Transmission
speed: 600bps
Summary of Contents for FAX-L350
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