Multi-Tech Systems MT2834ZPX owner manual Appendix B Tone Dial Frequencies

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MT2834ZPX Owner's Manual

Appendix B - Tone Dial Frequencies

Hz

697

770

852

941

Hz

1

4

7

*

1209

Digits

2

5

8

0

1336

3

6

9

#

1477

A

B

C

D

1633

The tone-dialing method combines two frequencies for each of the twelve digits found on a Touch Tone dial pad. This method is referred to as Dual-Tone Multi-Frequency (DTMF) dialing. The four horizontal rows on a Touch-Tone keypad use the four low frequencies (697, 770, 852, 941 Hz), while the three vertical columns use the three high frequencies (1209, 1336, 1477 Hz). The generally accepted tone frequency tolerance is +0.02%.

For example, the digit 4 would be dialed by combining two tone frequencies. It would use the frequency 770 Hz from the second row, and the frequency 1209 Hz from the first column. In another example, the digit 9 would be dialed with the tone frequencies of 852 Hz and 1477 Hz.

The extended DTMF characters (A, B, C, D) are the high-end frequencies (1633 Hz) defined on some telephone sets with a fourth vertical column of buttons. This fourth column provides for extended PBX control functions; the actual functions provided are dependent on the PBX manaufacturer's implementation and feature set.

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Contents Page Record of Revisions Revision Description Contents Index Introduction and Description Modem Features Fax Features Product DescriptionSoftware Configuration How to Use This ManualInstallation and Connection AT Commands and S-RegistersService, Warranty & Technical Support/ BBS Testing Your ModemAppendices Installation and Configuration Safety WarningsConfiguration/Installation Procedure Configuration and Installation Procedure StepProcedureInstallation and Configuration Is Your MT2834ZPX Ready for Use? Operating Your MT2834ZPX Simple Operations Software Configuration Introduction Configuring Software for Your ModemPC Initialization Strings AT &F X4 S0= 2 MChanging Default Parameters Configuring Software for Your ComputerConfiguring Software for the Remote System Terminal EmulationFile Transfer Protocols When to Disable Data CompressionAT &F S0=0 X4 &E14 M 16550 Uart and Windows Disabling Error CorrectionAT &F S0=0 X4 &E0 M COMnFIFO=1 COM2FIFO=1Page Modem AT Commands Command a Default $BA0 Description Command Values Default $EB0 Description =0 thru $Fn Command Values Default Command Values Default Description Default &P1 Description RFn Command T = 0, 1, 2, or Values Default Description Command @ Remote Configuration Procedures Remote ConfigurationRemote Configuration Operation Procedures StepProcedure Password Commands Contd. Remote Configuration Operation ProceduresRegisters Escape Code CharacterReturn Character Pause Time for Comma S13 Remote Configuration Escape Character S29 Local Inactivity Timer S36 Time Between DTR Inactive and Modem Off-Hook Result Codes Q0 Multi-Tech Result CodesQ1 Standard AT Result Codes AT Commands and S-Register Summary Troubleshooting Modem Does Not Respond to CommandsPage Modem Dials But Cannot Make a Connection Page Modem Disconnects While Online File Transfer Is Slower Than It Should Be Modem Cannot Connect When AnsweringLosing Data Getting Garbage Characters on the Monitor Fax and Communications Software Won’t Run at the Same TimeTesting Your Modem Local Analog Loopback Test/V.54 Loop Local Analog Loopback TestDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test/V.54 Loop 2 Remote/ Automatic Digital Loopback Test local/manualDigital Loopback Test remote/automatic Service, Warranty and Tech Support Introduction Limited WarrantyTech Support On-line Warranty RegistrationRecording Modem Information Service To Download a file About the Multi-Tech BBSTo log on to the Multi-Tech BBS If you know the file nameIf you don’t know the file name About the Multi-Tech Fax-Back Service About CompuServe/InternetAppendix a Technical Specifications Modulation Intelligent FeaturesCommand Buffer Fax ModulationsCarrier Frequencies BpsBell Standard Carrier FrequenciesDataCarrier Frequencies Temperature Power Consumption ConnectorsDiagnostics DimensionsAppendix B Tone Dial Frequencies 697 770 852 941 1209 Digits 1336 1477 1633Appendix C FCC and Canadian Regulations RJ11C or RJ11W single line Appendix C FCC and Canadian Regulations Canadian Limitations Notice Index 15, 19 In-band Escape Sequence MultiExpress for Windows PBX/CBX Disconnect Drop Time for DSR/CTS/CD Rings Which Have Occurred Registers Serial port 17, 20, 21 17, 19