Toshiba GD-1201 Manuale Utente
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GD-1150/1151/1200/1201/1160/1260
DIALING/COMMUNICATION CONTROL
3 - 15
3
- 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.
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
Receiver
*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)
Signal name
Abbreviation
Function
Remarks
Calling tone
CNG
1100 Hz tone signal specified
by T.30 indicating the sender
is a FAX machine in the auto-
matic calling mode.
-
Call Menu signal
CM
Mainly indicates an available
modulation method such as
V.21, V.27ter, V.29, V.17,
V.34, etc.
Modulated by V.21 (L) *1.
Transmission rate: 300 bps
CM terminator
CJ
Indicates the detection of the
JM signal or the termination of
CM signal.
Modulated by V.21 (L) *1.
Transmission rate: 300 bps
Call Indicator signal
CI
Indicates the general commu-
nication functions. It is sent
when the V.8 procedure is
restarted.
For the late start only.
(P3-20)
Modulated by V.21 (L) *1.
Transmission rate: 300 bps
Signal name
Abbreviation
Function
Remarks
Answer amplitude tone
ANSam
2100 Hz tone signal ampli-
tude-modulated to 15 Hz.
Tone equivalent to CED of the
conventional machine.
Joint Menu signal
JM
Indicates the terminal type
such as a FAX machine.
Response to a CM sent from
the transmitter and informs
available modulation method.
Modulated by V.21 (H) *1.
Transmission rate: 300 bps