Multi Tech Equipment manual MTA128ST/NT does not respond to commands

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Troubleshooting

The MTA1 28ST/NT or power supply may be defective. If you have another Multi-Tech MTA1 28ST/NT, try swapping MTA128ST/NTs. If the problem goes away, the first MTA128ST/NT or power supply may be defective. Call Tech Support for assistance.

Caution: Do not under any circumstances replace the power supply module with one designed for another product, as it may damage the MTA1 28ST/NT and void your warranty.

The MTA128ST/NT does not respond to commands

Make sure the MTA1 28ST/NT is plugged in and turned on. (See None of the LEDs Light When the MTA 128S T/NT Is On.)

Try resetting your MTA128ST/NT by turning it off and on.

Make sure you are issuing the MTA128ST/NT commands from the data communications software, either automatically, or manually in terminal mode. (You cannot send commands to the MTA1 28ST/NT from the DOS prompt.)

Make sure you are in terminal mode in your data communications program. Then type AT and press ENTER. If you get an OK response, your connections are good and the problem likely is in your phonebook entry or session settings.

If you don’t get an OK, the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications pro- grams connect automatically to the COM port. Some connect when the software loads and remain connected until the program ends. Others, like MultiExpress Terminal, can disconnect without ending the program (make sure the Connect icon looks plugged in). MultiExpress Terminal also allows multiple terminals to be open, but only one can access the MTA128ST/NT at a time. If MultiExpress Terminal reports that it cannot make a connection, yet the MTA128ST/NT’s TR indicator is on, click on the Window menu to see if more than one terminal is open. The MTA128ST/NT’s TR indicator shows that the software has made a connection with the TA through the COM port.open, but only one can access the MTA128ST/NT at a time. If MultiExpress Terminal reports that it cannot make a connection, yet the MTA128ST/NT’s TR indicator is on, click on the Window menu to see if more than one terminal is open. The MTA128ST/NT’s TR indicator shows that the software has made a connection with the TA through the COM port.

Your communications software settings may not match the physical port the MTA128ST/NT is connected

to. The serial cable may be plugged into the wrong connector—check your computer documentation to make sure. Or you may have selected a COM port in your software other than the one the MTA1 28ST/ compare the settings in your software to the physical connection.

If the MTA1 28ST/NT is on, the cable is plugged into the correct port, the communications software is configured correctly, and you still don’t get an OK, the fault may be in the serial cable. Make sure it is firmly connected at both ends.

Is this the first time you have used the cable? If so, check the cable description on the packaging to

make sure the cable is correct for your computer.

Peripheral expansion cards, such as bus mouse and sound cards, may include a serial port preconfig- ured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory address, or interrupt request (IRQ) as your communications port. Be sure to disable any unused ports.

To look for address or IRQ conflicts, select File, Run in Program Manager, type MSD, and press ENTER. Then select Mouse, COM Ports, and IRQ Status and note the addresses and IRQs that are in use. If you find an IRQ conflict, note which IRQs are not being used, then change one of the conflicting devices to use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting devices.

To change a port address or IRQ, double-click the Control Panel icon, then the Ports icon. Click on the port you want to change, click Settings, click Advanced, and select the new port address and/or interrupt. If you wish to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with COM2, so

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Contents Page Revision Date Description Model MTA128ST/NT S000305C Rev. CTrademarks Contents Introduction and Description Product DescriptionIsdn BRI Line FeaturesSpid Service Profile ID NT1 ConnectionInterlace Pin TE SignalPin LED Indicators LED P1 LED P2 LED Command Interface Switch CompatibiltiyLED Indicators ConnectorsSafety Warnings Hardware InstallationConnecting your TA Connect the TA to Your PC RS-232 Connection Introduction Configuration UtilitiesNetwork Configuration Before You StartCall Control Configuration Voice TEICOM Port Settings Dialing NumbersDCD Drop Time Configuring your TA Page Page Page Page Page Page Page Page MTA128S T/NT Commands and S-Registers AT CommandsAT Commands by Function Registers Digital Data Call Commands aAnalog Pots Call Commands Register SummaryAT Commands, S-Registers, and Result Codes Using AT Commands to Operate the MTA128ST/NT Result CodesMaking a Call Answering a CallAnswering Manually Hanging UpAnswering Automatically Troubleshoot ing Troubleshooting the TASpecific Troubleshooting Situations IntroductionNone of the LEDs light when the MTA128ST/NTis on Debugging/Logging/Troubleshooting CommandsDebugging/Logging/Troubleshooting S-Registers Debugging/Logging/Troubleshooting Command Summary ATMTA128ST/NT does not respond to commands MTA128ST/NT dials but cannot make a connection You can place data calls but not voice calls or vice versaMTA128ST/NT disconnects while online MTA128ST/NT cannot connect when answeringYou cannot place two simultaneous data calls File transfer appears slower than it should beApple Macintosh Compatibility Software Applications that can Format PPP Data Bonding Using the &, I and + CharactersMaking PPP/MLPPP Connections Dynamic Bandwidth Allocation DBADBA Features Bandwidth-on-Demand BOD-S60, S61, S62, and S63 DBA Data ProtocolsPPP/MLPPP Warranty Warranty, Service, and Tech SupportRepair Procedures for U.S. and Canadian Customers Replacement Parts Repair Procedures for International DistributorsQuick Setup Factory Profiles AppendixAConfiguration ProfilesQuick Setup Example Appendix B Ordering Your Isdn Li ne Bearer ServiceLoop Qualification Using Isdn Ordering Codes IOCs Capability S previously Generic Data M J3 previously Generic Data J-1DNM5 previously Generic Data M-1DN Ordering Isdn Without IOCs Appendices Appendices AppendixC FCCand Canadian Regulation FCCCanadian Limitations Notice Configuration via AT Commands AppendixD Configuration MethodsFirmware-based Configuration Utility Using AT Commands to Configure the MTA128ST/NTSymbol GlossaryGlossary IETFInternet Engineering Task Force PPPMultilink Protocol or MP-is an Internet Glossary TA-Seeterminal adapter Information pages from a central resource. See also Isdn Index Canadian Regulation 56 AppendixUart