Canon FAX-L1000 - Manual (Page 225)

3-81
FAX-L1000 Chapter 3: Technical Reference
b-2) Probing (Phase 2)
The line characteristics are measured and modulation-related parameters, such as symbol
rate, are set.
• Transmitter
Abbre-
Signal viation Meaning Remarks
INFO sequence INFO0c
Tone B B
Tone B B
Probing signal L1
L1
Probing signal L2
L2
• Receiver
Abbre-
Signal viation Meaning Remarks
INFO sequence INFO0a
Tone A A
Tone A A
INFO sequence INFO0h
Indicate modem capabilities,
such as baud
rate and frequency
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.
Transmit the signal at a level 6
dBm higher than the transmission
signal level set by the attenuator.
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.
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.
Transmission
speed: 600bps
The phase of the A-
signal is inverted 180
degrees from the phase
of the A signal.
Transmission
speed: 600bps