Toshiba DP120F Service Manual page 580

b-1) Network interaction (Phase 1)
The V.8 procedure is performed as the start up procedure for the V.34 high-speed
modem.
In the V.8 procedure, mainly the optimum modulation method (V series modem mode)
that can be operated between transmitter and receivers, is determined.
• Transmitter
Signal name
Calling tone
Call Menu signal
CM terminator
Call Indicator signal
• Receiver
Signal name
Answer amplitude
tone
Joint 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
DP120F/DP125F Dialing and Communication Procedure
Abbreviation
CNG 1,100-Hz tone specified by T.30 in-
dicating the facsimile machine has
the automatic call function.
CM It mainly indicates an available
modulation method such as V.21,
V.27ter, V.29, V17 and V.34.
CJ It indicates the detection of the JM
signal or the termination of CM sig-
nal.
CI It indicates the general communi-
cation functions. It is sent when
the V.8 procedure restarts.
Abbreviation
ANSam 2,100-Hz tone amplitude-modulated
to 15 Hz.
JM It indicates the terminal type such
as a facsimile machine, and is a
response to a CM sent from the
transmitter and indicates jointly
available modulation method.
1,080 ± 100 Hz (980 Hz: 1,1180 Hz: 0)
1,750 ± 100 Hz (1,650 Hz: 1,1850 Hz: 0)
Meaning
Meaning
9-16
Remark
It is modulated by V.21 (L)
Transmission rate: 300 bps
It is modulated by V.21 (L)
Transmission rate: 300 bps
For late start only.
See figure 3-40.
It is modulated by V.21 (L)
Transmission rate: 300 bps
Remark
Tone equivalent to CED of the
conventional machine.
It is modulated by V.21 (H)
Transmission rate: 300 bps
March 2000 © TOSHIBA TEC
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