Toshiba GD-1270, GD-1260 Calling tone, Call Menu signal, CM terminator, Call Indicator signal

-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	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	Modulated by V.21 (L) *1.
		modulation method such as	Transmission rate: 300 bps
		V.21, V.27ter, V.29, V.17,
		V.34, etc.
CM terminator	CJ	Indicates the detection of the	Modulated by V.21 (L) *1.
		JM signal or the termination of	Transmission rate: 300 bps
		CM signal.
Call Indicator signal	CI	Indicates the general commu-	For the late start only.
		nication functions. It is sent	(P3-20)
		when the V.8 procedure is	Modulated by V.21 (L) *1.
		restarted.	Transmission rate: 300 bps

Receiver

Signal name	Abbreviation	Function	Remarks
Answer amplitude tone	ANSam	2100 Hz tone signal ampli-	Tone equivalent to CED of the
		tude-modulated to 15 Hz.	conventional machine.
Joint Menu signal	JM	Indicates the terminal type	Modulated by V.21 (H) *1.
		such as a FAX machine.	Transmission rate: 300 bps
		Response to a CM sent from
		the transmitter and informs
		available modulation method.

*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)

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