Toshiba GD-1210, GD-1260, GD-1250, GD-1270, GD-1160 9600 bps, 7200 bps, 4800 bps, 2400 bps, Tcf

(4)Training

The training is performed in the binary procedure to surely transmit the image signals.

•Training signal

The training signal is transmitted following the DCS signal at the modem speed specified by the DCS signal. Responding to this training signal, the receiving side adjusts the auto-equal- izer.

•Format of the training signal - 14.4 Kbps, 12 Kbps

Segment 1	Segment 2	Segment 3	Segment 4
Alternation	Equalizer	Chain-store
	adjustment	information	Scrambled binary data “1”	TCF
of ABAB
	pattern	sequence
106 msec	1240 msec	27 msec	20 msec
		1393 msec

Fig. 3-4

-9600 bps, 7200 bps

Segment 1 Segment 2 / Segment 3 Segment 4

V.29

No signal	Repeating 2-state		Scrambled data “1”	TCF
	signal
		(Binary)	(Hexa or octal)
20 msec	53 msec+160 msec		20 msec
		253 msec

Fig. 3-5

-4800 bps, 2400 bps

	Segment 1Segment 2 Segment 3			Segment 4	Segment 5
	Non-		Continuous	0° to 180°
			180° phase
V.27ter	modulated	No signal		2-phase pattern	Scrambled data “1”	TCF
			inversion
	carrier
			(Binary)	(Binary)	(Hexa or octal)

4,800 bps: 923 msec,

2,400 bps: 1158 msec

Fig. 3-6

•TCF signal

An error may occur in the image data if the training is not performed correctly. The transmit- ting side sends a TCF signal and checks if any error occurs in image data before the image data communication to follow. When the receiving side detects an error in the TCF signal, it transmits an FTT signal to the transmitting side to request the retraining. When there is no error, the receiving side transmits a CFR signal.

The TCF signal transmits all zeros for 1.5 seconds at the same modem speed as that for the training signal.

GD-1210/1250/1270/1160/1260	© 2006 - 2011 TOSHIBA TEC CORPORATION All rights reserved
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