Canon FAX L1000 Service Manual page 224

FAX-L1000 Chapter 3: Technical Reference
b-1) Network interaction (Phase 1)
The V.8 protocol is used as the startup protocol for high-speed modem V.34.
The V.8 protocol determines the best modulation method (V-series modem mode) that is
available between the transmitter and receiver.
• Transmitter
Signal
Calling tone
Dial-tone menu
signal
CM terminator
Dial-tone display
signal
• Receiver
Signal
Modified response
tone
Common menu
signal
*1
V.21(L): Low-frequency channel defined by V.21 recommendation
V.21(H): High-frequency channel defined by V.21 recommendation
Abbre-
viation
CNG
CM
CJ
CI
Abbre-
viation
ANSam
JM
1080±100 Hz (980 Hz:1, 1180 Hz:0)
Transmission speed: 300bps
1750±100 Hz (1650 Hz:1, 1850 Hz:0)
Transmission speed: 300bps
Meaning
1100-Hz tone signal specified
by T.30 to identify an
automatic-calling fax
machine.
Indicate an available
modulation method
(V.21, V.27ter, V.29, V.17, or
V.34).
Indicate JM signal detection
and CM signal termination.
Indicate the general
transmission function.
Sent to resume the V.8
protocol.
Meaning
2100-Hz tone signal
amplitude-modulated by 15
Hz.
Indicate the terminal type,
such as a fax machine, and an
available modulation method
in response to the available
modulation method reported
by the CM from the
transmitter.
3-80
Remarks
Modulated by
*1
V.21(L) .
Modulated by
*1
V.21(L) .
Late start only.
(See Figure 3-36.)
Modulated by
*1
V.21(L) .
Remarks
Equivalent to CED
for previous models.
Modulated by
*1
V.21(H) .