Multi-Tech Systems MT3334SMI manual AT+FRH=3 No Carrier

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Chapter 3 - Class 1 Fax Commands

Table 3-3. Single-Page Class 1 Answer & Receive Example

		Action by	Action by
Command	Respone	Local Modem	Remote PC
AT+FCLASS=1	OK	Set Class to 1
	RING	Detect Ringing	Dial, send CNG
ATA		Off hook,
		Send CED,	Get CED
		Send V.21 carrier	Detect carrier
	CONNECT	Send flags	Detect flags
<CSIframe data>		Send CSI data	Receive FCS
<DLE><ETX>		Send FCS
	CONNECT	Send flags
<DISframe data>		Send DIS data	Receive DIS
<DLE><ETX>		Send FCS and flags
	OK	Drop carrier
AT+FRH=3		Detect carrier	Sends V.21 carrier
	CONNECT	Detect flags	Send flags
	<TSI frame data>	Receive TSI	Send TSI frame
	<DLE><ETX>	Receive FCS	Send FCS
	OK	Accept FCS
AT+FRH=3	CONNECT
	<DCS packet data>	Receive DCS	Send DCS frame
	<DLER><ETX>	Receive FCS	Send FCS
	OK	Accept FCS
AT+FRH=3	NO CARRIER	Detect loss of	Drop carrier
		carrier
AT+FRM=96			Wait 75 msec.
	CONNECT	Detect carrier	Send V.29 carrier
	<TCF data>	Receive TCF	Send TCF data
	<DLE><ETX>	Detect carrier loss	Drop carrier
	NO CARRIER
AT+FTH=3		Send V.21 carrier	Detects carrier
	CONNECT	Send flags	Detects flags
<CFRframe data>		Send CFR frame	Receives CFR
<DLE><ETX>		Send FCS
	OK	Drop carrier
AT+FRM=96
	CONNECT	Detect carrier	Send V.29 carrier
	<page image data>	Receive page	Send page data
	<DLE><ETX>	Detect carrier loss	Drop carrier
AT+FRH=3			Wait 75 msec.
		Detects carrier	Sends V.21 carrier
	CONNECT	Detects flag	Sends flag
	<EOP frame data>	Receives EOP	Sends EOP packet
	<DLE><ETX>	Receives FCS	Send CRC
	OK	Accepts FTS
AT+FRH=3	NO CARRIER	Detects loss of	Drops carrier
		carrier
AT+FTH=3		Send V.21 carrier	Detect carrier
	CONNECT	Send flags	Detect flags
<MCF frame data>		Send MCF frame	Receive MCF frame
<DLE><ETX>		Send FCS
	OK	Drop carrier
AT+FRH=3		Receives carrier	Send V.21 carrier
	CONNECT	Detects flags	Send flags
	<DCN frame data>	Receives DCN	Send DCN frame
	<DLE><ETX>	Receives FCS	Send FCS
	OK	Accepts FCS
AT+FRH=3	NO CARRIER	Detect loss of	Drops carrier
		carrier
ATH0	OK	Hangs up

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Contents Data/Fax Socketed Modem Model MT3334SMI Evaluation KitPatents Revision DescriptionContents Index Introduction and Description ModemModule Developer’s Guide FeaturesIntroduction Product DescriptionIntroduction and Description Technical Specifications1200 bps MT3334SMI Physical Dimensions Physical DimensionsTest/Demo Board Specifications DS1LED1-LED4 MT3334SMI Test/Demo Board Block Diagram Test/Demo Board Block DiagramMT3334SMI Pinout MT3334SMI Pin-outTypical Application Hardware Considerations MT3334SMI Design ConsiderationsPC Board Layout Considerations Calculating Z for Tip and Ring TracesRecommended Transceiver MT3334SMI Placement KeyQty Name Description FCC Part Telecom Labeling RequirementsReregistration Industry Canada CS-03Multiple Listing AT Commands, S-Registers, and Result Codes Answer Repeat Last CommandAT Commands, S-Registers, and Result Codes Result Codes Enable/Disable Monitor Speaker VolumeMonitor Speaker Mode Return Online to Data ModeResult Code Format Modem ResetSr? Read Register Value Tone DialingStore Current Configuration Command &Fn Load Factory SettingsAsynchronous Communications Mode Display Current Settings\Jn Data Buffer Control Command &Zy=x Store Dialing Command\An Select Maximum MNP Block Size \Bn Transmit Break\Vn Protocol Result Code \Nn Error Correction Mode Selection\Tn Inactivity Timer \Qn Flow Control SelectionEnter Setup Password Command %DCn AT Command ControlCommand %En Fallback and Fall Forward Control Command +ES=n Enable Synchronous Buffered ModeRegisters Register Unit Range Default DescriptionS43 Terse Verbose Description Result CodesClass 1 Fax Commands Command Description Class 1 Fax Command SummaryResult Code Meaning Class 1 Fax Commands Fax MOD Modulation Parameter ValuesCommand Function Display Current Class Values Default Data modemModemModule Developer’s Guide Command Function Select Service Class Values Default Data modeFunction +FRS=? Enter Class 1 Fax Commands+FRM=? Enter Flow Control Result CodesSample Sessions Action by Command Respone Local Modem Remote PC AT+FRH=3 No Carrier ModemModule Developer’s Guide Class 2 Fax Commands +FAXERR Class 2 Fax Command ImplementationClass 2 Fax Commands EIA SP-2388 August +FAA+FBOR +FCQ+FCR Current Session Results +FDCCFax Capability Parameters +FDCSCurrent Session Parameters +FDFFCData Compression Format Conversion +FDIS+FET +FDR+FDT +FECM+FLPL +FK+FLID +FLNFC+FSPL +FPTS+FRBC +FREL+FTSI +FHNGMT3334SMI Remote Configuration ModemModule User Guide Basic ProcedureSetup Changing the Setup PasswordChanging the Remote Escape Character Remote ConfigurationMT3334SMI Troubleshooting Local Analog Loopback Test V.54 Loop Test procedureRemote Digital Loopback Test V.54 Loop TroubleshootingLocal digital loopback test Local Digital Loopback Test V.54 LoopUpgrade Procedure Multi-Tech Web Site Upgrade OverviewIdentify the Modem Firmware Identify the Current Firmware VersionDownload the Upgrade File Upgrade ProcedureMulti-Tech BBS Clear Your Stored Paramenters Extract the Upgrade FilesUse FlashPro to Upgrade Modem Firmware Restore Your ParametersAppendixes MT3334SMI Appendixes FCC FAX UpdateInternational Modem Restrictions Canadian Limitations NoticeEMC, Safety and Terminal Directive Compliance European Directives User Guide StatementNew Zealand Telecom Warning Notice Handshake Sequence Appendix B Multi-Tech Flash Programming ProtocolIntroduction Programming the ModemOther supported boot code commands Other programming concernsModemModule Developer’s Guide Program Sequence Intel Hex Format Data RecordXxxx Extended Address Record End of File RecordEeee Index IndexMT3334SM MT3334SMI MT3334SM