Toshiba GD-1370 Service Manual page 34

- Network interaction (Phase 1)
The V.8 procedure is performed as the startup 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 the transmitter and receiver 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 the V.21 recommendation 1,080±100 Hz
(980 Hz: 1, 1,180 Hz: 0)
- V.21 (H)
High frequency channel defined by the V.21 recommendation 1,750±100 Hz
(1,650 Hz: 1, 1,850 Hz: 0)
GD-1370
DIALING/COMMUNICATION CONTROL
Abbreviation
CNG 1100 Hz tone signal specified
by T.30 indicating the sender
is a fax machine in the
automatic calling mode
CM Mainly indicates an available
modulation method such as
V.21, V.27ter, V.29, V.17,
V.34, etc.
CJ Indicates the detection of the
JM signal and the termination
of the CM signal.
CI Indicates the general
communication functions. It is
sent when the V.8 procedure
is restarted.
Abbreviation
ANSam 2100 Hz tone signal
amplitude-modulated to 15 Hz
JM Indicates the terminal type
such as a facsimile machine
and informs the available
modulation method
corresponding to a usable
one sent from CM of a
transmitter.
3 - 14
Function
Modulated by V.21 (L)
Transmission rate: 300 bps
Modulated by V.21 (L)
Transmission rate: 300 bps
For the late start only
(P. 3-20)
Modulated by V.21 (L)
Transmission rate: 300 bps
Function
Tone almost equivalent to
CED of a conventional
machine.
Modulated by V.21 (H)
Transmission rate: 300 bps
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