9600 bps, 7200 bps, 4800 bps, 2400 bps, Tcf | Toshiba GD-1220

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-equalizer.

-Format of the training signal 14.4 Kbps, 12 Kbps

	Segment 1	Segment 2	Segment 3		Segment 4

	Alternation	Equalizer	Chain-store
	Alternation	adjustment	information		Scrambled binary data “1”		TCF
	of ABAB	adjustment	information		Scrambled binary data “1”		TCF
	of ABAB	pattern	sequence
		pattern	sequence

	106 msec	1240 msec	27 msec		20 msec

			1393 msec
			1393 msec

-9600 bps, 7200 bps

		Segment 1 Segment 2 / Segment 3				Segment 4

V.29		No signal	Repeating 2-state			Scrambled data “1”		TCF
V.29		No signal	signal			Scrambled data “1”		TCF
			signal
				(Binary)		(Hexa or octal)

		20 msec	53 msec+160 msec			20 msec

				253 msec
				253 msec

-4800 bps, 2400 bps

		Segment 1Segment 2 Segment 3			Segment 4	Segment 5

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

4,800 bps: 923 msec,

2,400 bps: 1158 msec

-TCF signal

An error may occur in the image data if the training is not performed correctly. The transmitting 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 receiv- ing 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.

3

© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved	GD-1220/1221
	DIALING/COMMUNICATION CONTROL

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Toshiba GD-1220, GD-1221 service manual 9600 bps, 7200 bps, 4800 bps, 2400 bps, Tcf

Contents

GD-1220/1221 Page Transportation/Installation Vorsicht Important Service Parts for Safety Contents 2006 2008 Toshiba TEC Corporation All rights reserved GD-1220 GD-1221 Remarks FAX OptionsSTUDIO165/205 Available STUDIO167/207/237 System firmware version Specifications Transmission system DBm to -8 dBm The setting can be changed by 1 dBEmbedded DBm to 0 dBm Level -55 dBm or lower cannot be detected Dimension width x length Printing area FolioComp Features Specifications and Outline of System 08/08 Accessories and Parts Following accessories and parts come with the FAX unitAccessory Qty Extends the FAX functions when the FAX unit is installed OptionsOption Function Model System List NA/EU/AU/TWADF Radf Units and Components Layout of PC Boards Symbol Name FunctionFAX PWA-F-NCU-631 Recording paper size LSU-RELATED Functions Size Horizontal x Vertical Effective recording area Effective recording area Inch Feed direction Mm 0.16 inch Effective recording area For MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inchSize Horizontal x Vertical Effective recording range 297 x 293 x A4-R 210 x 206 x A5-R 148 x 144 x 257 x 253 x Print mode Recording paper selection algorithm and print algorithm Recording paper selection algorithmPrint algorithm Judgment parameter Reception print flowchart Start Receive FAX Bit Discard parameter Discard printing Vertical reduction print Similar reduction print RTI Scanning For MJD, AUD, ASD, SAD, TWD, CND modelsST-R Comp Scanning width For MJD, AUD, ASD, SAD, TWD, and CND models Recording paper rangeRecording paper range A4-R Comp *2 Comp *1 Recording paper range LT long Comp long LD longRecording paper range A4 long B4 long A3 long Folio Folio *1 Error processing Order Drawer Limitations on reception print LSU-RELATED Functions Dial call-up transmission to a telephone circuit Circuit Connection and Procedure to Change ModeYES Standby state Procedure to select the transmission mode Selection of the communication modeCommunication mode Toshiba original procedure Telephone circuit Circuit control signals Signaling System Diagram and Signal FormsThis signal can be sent manually Signal form Signal name Signal form Image signal Communication with the binary signalsMode change is possible only for the original set manually Receiver Frames received Error occurred Only error frame retransmitted 1 completed 2 completed CED Nsfcsidis CFRMCF Binary signals PIN PIPPRI-EOM PRI-MPS When this frame is the last frame, X = FCF FIF FCSFormat Binary signal Format FCF format of each binary signal 9600 bps, 7200 bps 4800 bps, 2400 bpsTCF 3 V.8/V.34 communication sequence Line closed Standard procedure Transmitter Receiver Signal name Abbreviation Function Remarks Hz and 3,750 Hz in units Tone signal between150 Hz Frequency transmission Capability ALT TRN Receives an NSF sent from Maintains the synchroniza 7E H TionTransmitter Receiver Scrambled data frame to be Image data Image data are sent. TransmitterIs completed Encoded image data Turn off Scrambled 1 is sent for PPS-EOP Short training SignalTransmission of one Is completed Informs to disconnect the line Line closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control TEL mode FAX Automatic SwitchingFAX mode General functions DIALING/COMMUNICATION Control GD-1220/1221 Configuration Description of Circuits Configuration EU/AU/AS/C models Signal Name Type Active Description Destination Line path switching control circuitCML1 ATT3DB1 RLY3, IC3 IC3IC5 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Q53 Line 1 Dial Pulse Generation Signal Line Reverse Current Detection Signal IC23 Line Current Detection Signal IC23Line current detection circuit REVA1 Current Reverse Line 1 Current Detection IC23 Signal Line 1 Current Detection Signal IC23 CI detection circuit Line 1 CI Detect Signal IC23 Line 1 CI Detection Signal IC23 FAX board Line monitor circuit Ringer/Alarm Monitoring signalLine Monitor LOW High Sound volume PWA-F-FAX-635 GD-1220 PC Boards PWA-F-FAX-678 GD-1221 PWA-F-NCU-631 NAD, TWD, SAD PWA-F-NCU-631 MJD, AUD, ASD, CND Electrical Circuits Explanation to the Users Installation Installation