Toshiba GD-1220, GD-1221 service manual Standard procedure Transmitter Receiver, Line closed

Page 47

2) Standard procedure

	Transmitter	Receiver
		Line closed
Network interaction
(Phase 1)
(	P3-14)
Probing/Ranging
(Phase 2)
(	P3-15)
Equalizer/Echo
canceller training
(Phase 3)
(	P3-16)
Final training
(Phase 4)
(	P3-16)
Control channel
(	P3-17)
Primary channel
(	P3-18)
Image data
(	P3-18)
Communication
end procedure
(	P3-19)
	Line opened	Line opened
		Line opened

The available modulation mode is in formed. Each declares that it has V.34 capability. The procedure moves to V.34 in the phase 2.

After the information about the modem capa- bility is exchanged, the receiver determines the modulation speed based on the result of reception of the probing signal which was sent by the transmitter.

To determine the image transmission speed, the transmitter sends a training signal.

The optimum image transmission speed is determined according to the training signal received.

The pre-FAX transmission which is the same as that for the normal T.30 is performed at 1,200 bps.

The training signal is sent with the determined parameter, then the image data are sent.

The post-FAX transmission which is the same as that for the normal T.30 is performed at 1,200 bps.

3

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

3 - 13

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Contents GD-1220/1221 Page Transportation/Installation Vorsicht Important Service Parts for SafetyContents 2006 2008 Toshiba TEC Corporation All rights reserved System firmware version FAX OptionsGD-1220 GD-1221 Remarks STUDIO165/205 Available STUDIO167/207/237Specifications DBm to 0 dBm Level -55 dBm or lower cannot be detected DBm to -8 dBm The setting can be changed by 1 dBTransmission system EmbeddedComp Dimension width x length Printing areaFolio Features Specifications and Outline of System 08/08 Accessory Qty Accessories and PartsFollowing accessories and parts come with the FAX unit Option Function Model Extends the FAX functions when the FAX unit is installedOptions ADF Radf System ListNA/EU/AU/TW Units and Components PWA-F-NCU-631 Symbol Name FunctionLayout of PC Boards FAXRecording paper size LSU-RELATED FunctionsSize Horizontal x Vertical Effective recording area Effective recording area297 x 293 x A4-R 210 x 206 x A5-R 148 x 144 x 257 x 253 x For MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inchInch Feed direction Mm 0.16 inch Effective recording area Size Horizontal x Vertical Effective recording rangePrint mode Print algorithm Recording paper selection algorithm and print algorithmRecording paper selection algorithm Judgment parameter Reception print flowchart Start Receive FAXBit Discard parameter Discard printingVertical reduction print Similar reduction print RTI Scanning width For MJD, AUD, ASD, SAD, TWD, CND modelsScanning ST-R CompRecording paper range A4-R For MJD, AUD, ASD, SAD, TWD, and CND modelsRecording paper range Folio Folio *1 Recording paper range LT long Comp long LD longComp *2 Comp *1 Recording paper range A4 long B4 long A3 longError processing Order Drawer Limitations on reception printLSU-RELATED Functions Standby state Circuit Connection and Procedure to Change ModeDial call-up transmission to a telephone circuit YESTelephone circuit Selection of the communication modeProcedure to select the transmission mode Communication mode Toshiba original procedureSignal name Signal form Signaling System Diagram and Signal FormsCircuit control signals This signal can be sent manually Signal formReceiver Communication with the binary signalsImage signal Mode change is possible only for the original set manuallyFrames received Error occurred Only error frame retransmitted 1 completed 2 completedMCF CED NsfcsidisCFR Binary signals PRI-MPS PIPPIN PRI-EOMFormat When this frame is the last frame, X =FCF FIF FCS Binary signal Format FCF format of each binary signalTCF 9600 bps, 7200 bps4800 bps, 2400 bps 3 V.8/V.34 communication sequence Line closed Standard procedure Transmitter ReceiverSignal name Abbreviation Function Remarks Frequency transmission Capability Tone signal betweenHz and 3,750 Hz in units 150 HzALT TRNReceiver Maintains the synchroniza 7E H TionReceives an NSF sent from TransmitterEncoded image data Turn off Scrambled 1 is sent for Image data Image data are sent. TransmitterScrambled data frame to be Is completedInforms to disconnect the line Short training SignalPPS-EOP Transmission of one Is completedLine closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control General functions FAX Automatic SwitchingTEL mode FAX modeDIALING/COMMUNICATION Control GD-1220/1221 ConfigurationDescription of Circuits ConfigurationEU/AU/AS/C models ATT3DB1 Line path switching control circuitSignal Name Type Active Description Destination CML1IC5 RLY3, IC3IC3 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Q53Line 1 Dial Pulse Generation Signal REVA1 Line Current Detection Signal IC23Line Reverse Current Detection Signal IC23 Line current detection circuitCurrent Reverse Line 1 Current Detection IC23 Signal Line 1 Current Detection Signal IC23CI detection circuit Line 1 CI Detect Signal IC23Line 1 CI Detection Signal IC23 FAX board Line monitor circuitLOW High Monitoring signalRinger/Alarm Line MonitorSound volume PWA-F-FAX-635 GD-1220 PC BoardsPWA-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 InstallationInstallation

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