GD-1060 DIALING AND COMMUNICATION PROCEDURE
4 - 16
January 2001 © TOSHIBA TEC
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
• Receiver
*1
V.21 (L) ....... Low frequency channel defined by V.21 recommendation
1,080 ± 100 Hz (980 Hz: 1,1180 Hz: 0)
V.21 (H) ...... High frequency channel defined by V.21 recommendation
1,750 ± 100 Hz (1,650 Hz: 1,1850 Hz: 0)
Signal name
Calling tone
Call Menu signal
CM terminator
Call Indicator sig-
nal
Abbreviation
CNG
CM
CJ
CI
Meaning
1,100-Hz tone specified by T.30
indicating the facsimile machine
has the automatic call function.
It mainly indicates an available
modulation method such as V.21,
V.27ter, V.29, V17 and V.34.
It indicates the detection of the JM
signal or the termination of CM
signal.
It indicates the general commu-
nication functions. It is sent when
the V.8 procedure restarts.
Remark
It is modulated by V.21 (L)
*1
.
Transmission rate: 300 bps
It is modulated by V.21 (L)
*1
.
Transmission rate: 300 bps
For late start only.
See Fig. 4-3-2.
It is modulated by V.21 (L)
*1
.
Transmission rate: 300 bps
Signal name
Answer amplitude
tone
Joint Menu signal
Abbreviation
ANSam
JM
Meaning
2,100-Hz tone amplitude-modu-
lated to 15 Hz.
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.
Remark
Tone equivalent to CED of
the conventional machine.
It is modulated by V.21 (H)
*1
.
Transmission rate: 300 bps