Toshiba GD-1201, GD-1260 Tone signal between, Hz and 3,750 Hz in units, 150 Hz, Data transmission

-Probing/Ranging (Phase 2)

Examines the line characteristics and sets the parameters for the modulation related items such as the modulating speed.

Transmitter

Signal name		Abbreviation		Function			Remarks
INFO sequence		INFO0c		Informs the modem capability	Transmission rate: 600 bps
				such as modulating speed
				and frequency transmission
				capability (two frequency
				bands (high and low) used to
				examine the line characteris-
				tics), and requests for adjust-
				ing.
Tone B			B	Synchronization between the			is a signal that shifts the
						B
				modems by 1200 Hz tone sig-	phase B 180°.
Tone	B		B	nal
Line probing signal L1		L1		Tone signal to analyze the line	Probing is to examine the line
				characteristics by probing	characteristics.
Line probing signal L2		L2
					Tone signal between 150
					Hz and 3,750 Hz in units of
					150 Hz

Receiver

Signal name		Abbreviation		Function			Remarks
INFO sequence		INFO0a		Informs the modem capability	Transmission rate: 600 bps
				such as the modulating speed
				and frequency transmission
				capability.
Tone A			A	Synchronization between the			is a signal that shifts the
						A
				modems by 2,400 Hz tone	phase A 180°.
Tone				signal
	A		A
INFO sequence		INFO0h		Based on the analysis of the	Transmission rate: 600 bps
				line probing signal sent from
				the transmitter, it informs the
				pre-emphasis filter and modu-
				lating speed to be used for the
				data transmission.

GD-1150/1151/1200/1201/1160/1260	© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
DIALING/COMMUNICATION CONTROL

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