Specifications

CHAPTER 2 OPERATION AND TIMING
2-60
COPYRIGHT © 1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
b. Probing/Ranging (phase 2)
The characteristics of the line are measured, and such modulation-related parameters as
modulation speed are set.
• Transmitting Device
• Receiving Device
Signal
INFO sequence
Tone B
Tone B
Line probing
signal L1
Line probing
signal L2
Notation
INFO0c
B
B
L1
L2
Description
Communicates modem
capabilities such as modulation
speed, frequency (high and low
ranges used in measuring line
characteristics) and requests
adjustments.
Uses 1200 Hz tone signals.
Synchronizes modems.
Is a tone signal used to interpret
the line characteristics in probing.
Remarks
Transmission speed:
600 bps
B is a signal resulting
from rotating the phase
of B by 180°.
"Probing" refers to
measuring of line
characteristics.
Tone signals in 150-Hz
increments between
150 Hz and 3750 Hz.
Signal
INFO sequence
Tone A
Tone A
INFO sequence
Notation
INFO0a
A
A
INFO0h
Description
Communicates modulation
speeds, transmission frequencies,
and other modem capabilities.
Uses 2400-Hz tone signal.
Synchronizes modems.
Communicates the modulation
speed and the pre-emphasis filter
used for data transmission based
on the results of interpretation
made by the line probing signal
coming from the transmitting
device.
Remarks
Transmission speed:
600 bps
A is the result of
rotating the phase of A
by 180°.
Transmission speed:
600 bps