Multi-Tech Systems MT9234ZBA-V manual Modem Cannot Connect When Dialing

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Multi-Tech Systems, Inc. MT9234ZBA-Series User Guide (S000387C)
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You can narrow the list of possibilities by using extended result codes. Extended result codes are enabled by default. If they have been disabled, include V1X4 in the modem’s initialization string, or in terminal mode enter ATV1X4 and press ENTER. When you dial again, the modem reports the call’s progress.
If the modem reports NO DIALTONE, check that the modem’s telephone line cable is connected to both the modem’s LINE jack (not the PHONE jack) and the telephone wall jack. If the cable looks secure, try replacing it. If that doesn’t work, the problem might be in your building’s telephone installation. To test the building installation, plug a telephone into your modem’s telephone wall jack and listen for a dial tone. If you hear a dial tone, your modem might be installed behind a corporate phone system (PBX) with an internal dial tone that sounds different from the normal dial tone. In that case, the modem might not recognize the dial tone and might treat it as an error. Check your PBX manual to see if you can change the internal dial tone. If you can’t, change your modem’s initialization string to replace X4 with X3, which will cause the modem to ignore dial tones.
If the modem reports BUSY, the other number might be busy, in which case you should try again later. However, it might indicate that you have failed to add a 9, the prefix to the phone number if you must dial 9 for an outside line.
If you must dial 9 to get an outside line, the easiest way to dial it automatically is to include it in the modem’s dial prefix; e.g., ATDT9. Note the comma, which inserts a pause before the number is dialed. By inserting 9, into the dial prefix, you do not have to include it in each directory entry.
To change the dial prefix in Windows HyperTerminal, select Connect from the Call menu, click Dialing Properties, and type 9 in the local and long distance boxes in How I dial from this location.
If the modem reports NO ANSWER, the other system has failed to go off-hook, or you might have dialed a wrong number. Check the number.
If the modem reports NO CARRIER, the phone was answered at the other end, but no connection was made. You might have dialed a wrong number, and a person answered instead of a computer, or you might have dialed the correct number but the other computer or software was turned off or faulty. Check the number and try again, or try calling another system to make sure your modem is working. Also, try calling the number on your telephone. If you hear harsh sounds, then another modem is answering the call, and the modems might be having problems negotiating because of modem incompatibilities or line noise. Try connecting at a lower speed.
Poor line conditions can affect the connection. When using V.34 or V.32 client-to-client connections in poor conditions, setting S38=0 may result in better performance.

Chapter 6 – Troubleshooting

Is this the first time you have used the cable? If so, it may not be wired correctly. Check the cable description on the packaging to make sure the cable is the right one for your computer.

Peripheral expansion cards, such as sound and game cards, might include a serial port preconfigured 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 communication port. Be sure to disable any unused ports.

The serial port might be defective. If you have another serial port, install the modem on it, change the COM port setting in your software, and try again.

The modem might have a problem beyond the scope of this user guide. If you have another Multi-Tech modem, try swapping modems. If the problem goes away, the first modem is possibly defective.

The Modem Cannot Connect When Dialing

There can be several reasons the modem fails to make a connection. Possibilities include

lack of a physical connection to the telephone line.

a wrong dial tone.

a busy signal.

a wrong number.

no modem at the other end.

a faulty modem, computer, or software at the other end.

incompatibility between modems

poor line conditions.

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Contents MultiModem ZBA PN S000387C, Version C Copyright TrademarksPatents World HeadquartersContents Introduction FeaturesAT Commands Info Technical Specifications CE MarkInstallation Safety WarningsChange the Internal Jumpers Opening the ModemChanging the Voice Jumper Connect the Modem to Your PC Connect the Modem to the AC Power Outlet Power-On TestInstall the Modem Driver Windows InstallerPage Configure the Modem for Your Country or Region Using the Global Wizard to Configure Your ModemUsing AT Commands to Configure Your Modem Click Initial Setup and Country/Region SelectionSetup Connecting to the InternetOperation About the Front PanelChanging the Remote Escape Character Remote ConfigurationChanging the Setup Password Turning Callback Security On and Off Changing the Setup PasswordCallback Security Setting Callback Security Message Parity Assigning Callback Passwords and Phone NumbersNumber-Entry Callback Calling ProceduresPassword-Only Callback Extension-Entry Callback Direct ConnectionCallback Security Commands Callback Assignments FormModem Does Not Respond to Commands TroubleshootingNone of the Indicators Light Modem Cannot Connect When Dialing Page Data Is Being Lost There Are Garbage Characters on the MonitorModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeDownload the Upgrade File Appendix a Upgrading the Modem’s FirmwareIdentify the Modem Firmware Identify the Current Firmware VersionExtract the Upgrade Files Upgrade the Modem’s FirmwareRestore Your Parameters Clear Your Stored ParametersFCC Part 68 Telecom Appendix B Regulatory ComplianceFCC Part 15 Regulation EMC, Safety and R&TTE Directive Compliance Canadian Limitations NoticeIndustry Canada Thailand ApprovalJapan Requirements New Zealand Telecom Warning NoticeSouth African Statement Brazil Special Cable for MT9234ZBA model only Special phone cable is required for regulatory complianceReach Statement Appendix C Environmental InformationWeee Waste Electrical and Electronic Equipment Statement Appendix C Environmental Info Rohs HT/TS Substance Concentration CR6+Appendix D Installing a Modem under Linux Configure for Callback Security in Direct Connect Mode Appendix E Connecting to a Cisco RouterConfigure the Modem for your Country or Region Console Port Connections Console Port Final SetupRemote Configuration AT commands Index
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MT9234ZBA-V, MT9234ZBA specifications

Multi-Tech Systems has long been a trusted name in the field of communication technology, and its MT9234ZBA and MT9234ZBA-V modem products exemplify the company's commitment to delivering robust and reliable connectivity solutions. These modems are ideal for a range of applications, including telephony, data communication, and remote monitoring, making them a versatile choice for both personal and professional use.

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