Toshiba GD-1260, GD-1250, GD-1270, GD-1160, GD-1210 service manual 3 V.8/V.34 communication sequence

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3.2.3V.8/V.34 communication sequence

1)Outline

-V.8 is performed as a startup procedure to switch to V.34. V.8 can connect an existing facsimile machine to the equipment using a data modem or other V-series modems. The V.34 modem has a modem circuit previously recommended, allowing it to be also connected to the existing modems while they are upper compatible.

-New technologies such as the pre-emphasis technology *1 and the probing technology *2 are fully used. The pre-emphasis technology *1 not only speeds up the modulation, but also gains the S/N ratio. The probing technology examines the line characteristics and optimizes the modem for the line condition. Therefore, not only do these technologies speed up the transmis- sion momentarily, but also the average speed of the process during the data transmission is increased.

-For V.8 and the pre/post-FAX transmission for V.34, the procedure is speeded up by the full duplex communication.

-Following 14 types of the image transmission speed are available: *3

33.6kbps/31.2 kbps/28.8 kbps/26.4 kbps/24.0 kbps/21.6 kbps/19.2 kbps/16.8 kbps/14.4 kbps/

12.0kbps/9.6 kbps/7.2 kbps/4.8 kbps/2.4 kbps

-The modulating speed (baud rate) *4 can be selected from 2,400, 3,000, 3,200 symbol/sec (man- datory), or 2,743, 2,800, 3,429 symbol/sec (option). The data rate can be set more accurately than the conventional modem.

*1: A signal is sent while raising the output level in the high-frequency band in which the noise is relatively loud.

*2: Tone signal called “Probing Tone” is sent for the receiver to examine the line characteris- tics of the line.

*3: In the ITU-T Recommendation, it is described as “data rate”. “Image transmission speed” is the same as “data rate”.

*4: In the ITU-T Recommendation, it is described as “symbol speed”. The “Symbol rate”, “Modulating speed”, and “Baud rate” are the same thing. This machine cannot realize the speed of 2,743 symbol/sec.

Notes:

1.ECM is used in the V.34 procedure. If the setting for the ECM transmission/reception of the user data is set to “Not performed”, the V.8 procedure is not performed and the procedure is not switched to V.34. V.17 or lower is selected in this case.

2.When the transmission/reception speed is set to 14.4 kbps or slower, the V.8 procedure is not performed, and V.17 or lower is selected.

3.See “Late start (P3-20)” to move to the V. 8/V.34 procedure after starting with the V.21 proce- dure.

4.After the V.34 procedure is started, the fallback for the V.34 procedure is performed. However, the fallback for the V.17 mode or lower mode is not performed.

3

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GD-1210/1250/1270/1160/1260

 

DIALING/COMMUNICATION CONTROL

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Contents GD-1210/1250/1270/1160/1260 Trademarks Transportation/Installation General Precautions at Service Vorsicht When the option has been installedPage Contents Explanation to the Users InstallationModels FAX unit 2nd line for FAX unit FAX OptionsOriginal size SpecificationsFolio 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 EmbeddedST-R Paper size Dimension width x length Printing areaComp Features 11/04 Parts GD-1210 GD-1250 GD-1270 Accessories and PartsFollowing accessories and parts come with the FAX unit Accessory GD-1210 GD-1250 GD-1270Options Extends the FAX functions when the FAX unit is installedMents to be output Option Function STUDIO206L/256/306/356STUDIO2500c/3500c/3510c System ListNA/AU/EU/C/TW STUDIO2330C/2820C/2830C/3520C/3530C/4520CSTUDIO5520C/6520C/6530C Offset Tray MJ-5005 STUDIO205L/255/305/355/455NA/EU-N/AU/C STUDIO555/655/755/855Pedestal PFP Feeder LCF KD-1027/C KD-1028 A4/LT/C STUDIO2040C/2540C/3040C/3540C/4540CSTUDIO5540C/6540C/6550C STUDIO556/656/756/856 Saddle stitch Finisher MJ-1106/C STUDIO206L/256/306/356/456Inner Finisher MJ-1032 Saddle stitch MJ-1033 Overview LINE2 connector Line connector TEL connectorReversing automatic document feeder TEL connector Line connectorDrawers STUDIO5520C/6520C/6530C, e-STUDIO5540C/6540C/6550C STUDIO205L/255/305/355/455, e-STUDIO206L/256/306/356/456 Power switch TEL connector Line connector LINE2 connectorSTUDIO555/655/755/855, e-STUDIO556/656/756/856 Power switch LINE2 connector Line connector TEL connectorNCU MDM FAX FAX PWR Symbol Name FunctionLayout of PC Boards FAX FAX PWRLSU-RELATED Functions Recording ModeRecording paper selection algorithm Recording Paper Selection Algorithm and Printing AlgorithmPrinting algorithm ST against A3/B4/A4/LD/LT size originals respectively Discard function Length of B Discard parameter Set value Effective printing lengthOFF A5 , Comp LT, Comp COMP, LD LG/LT, LD ST, Folio B5, Folio B4, A3 A4, B4 B5, B4 A5, A4Setting for the split recording Recording Paper and Function Others Table of the recording paper selection modesPriority Energy Saver Energy Saver ModeUser Functions Receiving FAX document, or byMemory Reception 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 formCommunication with the binary signals Receiver Image signalMode change is possible only for the original set manually Mode change possible Informing that there is the nextFrames received Error occurred Only error frame retransmitted 1 completed 2 completedMCF JOB Status button Cancel buttonCED Nsfcsidis CFRBinary signals PRI-MPS PIPPIN PRI-EOMFCF FIF FCS When this frame is the last frame, X =Format Binary signal Format FCF format of each binary signal4800 bps, 2400 bps 9600 bps, 7200 bpsTCF 3 V.8/V.34 communication sequence Line closed Standard procedure Transmitter ReceiverSignal name Abbreviation Function Remarks Data transmission Tone signal betweenHz and 3,750 Hz in units 150 HzALT TRNTransmitter FlagMaintains the synchroniza 7E H Tion Receives an NSF sent fromEncoded 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 completed FlagLine closed DIS cannot be recognized Transmitter Receiver Transmitter Receiver DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control General functions FAX Automatic SwitchingTEL mode FAX modeGD-1210 GD-1160 ConfigurationGD-1250 / GD-1270 GD-1260 Description of Circuits ConfigurationEU/AU/AS/C models ATT3DB1 Line path switching control circuitSignal Name Type Active Description Destination CML1IC3 RLY3, IC3IC5 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Q53Line 1 Dial Pulse Generation Signal REVA1 Line Current Detection Signal IC29 IC26Line Reverse Current Detection Signal IC29 IC26 Line current detection circuitCurrent Reverse Line 1 Current Detection IC29 IC26 Signal Line 1 Current Detection Signal IC29 IC26CI detection circuit Line 1 CI Detect Signal IC29 IC26Line 1 CI Detection Signal IC29 IC26 NCU board Line1 Line monitor circuitLOW High Monitoring signalRinger/Alarm Line MonitorSound volume Relation between the signals and sound volume is as followsPWA-F-FAX-631 GD-1210 PC BoardsPWA-F-FAX-670 GD-1250/1270 08/04 08/04 PWA-F-MDM-563 GD-1160 PWA-F-MDM-671 GD-1260 PWA-F-FAX-POWER-631 GD-1210 Electrical Circuits Explanation to the Users InstallationInstallation
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