Multi-Tech Systems MT5600BA, MT5600BL manual Modem4Cannot Connect When Answering

Page 88

MultiModemII User Guide

Check for loose connections between the modem and the computer, the tele- phone jack, and AC power.

You might have had a poor connection because of line conditions or the problem

4might have originated on the other end of the line. Try again.

If you were online with a BBS or an online service like CompuServe, it might have hung up on you because of lack of activity on your part or because you ex- ceeded your time limit for the day. Try again.

The Modem4Cannot Connect When Answering

Autoanswer might be disabled. Turn on autoanswer in your datacomm program or send the command ATS0=1 (ATS0=2 if you have Caller ID service) to your modem in terminal mode.

File Transfer4Is Slower Than It Should Be

You might have an older UART. For best throughput, install a 16550AFN UART or a Multi-Tech ISI serial port card. See the “Quick Start” chapter for information

4on how to identify your UART.

If you are running under Windows 3.1 and have a 16550AFN UART, you must replace the Windows serial driver, COMM.DRV, to take full advantage of the UART’s speed.

If you are using a slow transfer protocol, such as Xmodem, try Zmodem or Ymodem/G instead.

Is your line noisy? If there is static on your line, the modem has to resend many

4blocks of data to insure accuracy. You must have a clean line for maximum speed.

Are you downloading a compressed file with MNP 5 hardware compression en- abled? Since hardware data compression cannot compress a file already compressed by an archiving program, the transfer can be marginally slower with data com-

4pression enabled than with it disabled.

Does your Internet service provider (ISP) use the same 56K protocol as your mo- dem? The default setting of your modem is to connect using either the K56flex or the V.90 protocol, depending on which one the ISP modem is using. If your ISP uses the X2 protocol, the maximum speed you will be able to connect at is 33,600 bps. Check with your ISP to see which protocols it supports, and check the Multi-

4Tech Web site for the latest developments in V.90.

Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.

80

Image 88

Contents Model MT5600BA Model MT5600BL Record of Revisions FCC Part Using the Front Panel IntroductionQuick Start MultiModemII User GuideAT Commands, S-Registers & Result Codes Remote ConfigurationSolving Problems Callback SecurityAppendix D Warranty, Service, and Technical Support Appendix a Regulatory ComplianceAppendix C Loopback Tests Appendix E Upgrading the ModemContents Viii Introduction Introduction FeaturesProduct Description Introduction DataWhat Is in Your Modem Package? Related ManualsQuick Start Safety Warnings What You Will NeedWe supply You supplyConnect the Modem to Your System RS232 ConnectionDialup Connection Quick StartTwo-Wire Leased Line Connection Four-Wire Leased Line ConnectionPower Connection Power-On TestAdding the Modem to Windows Install the Modem in WindowsRemoving Your Old Modem from Windows Install and Configure Your Software Call the Multi-Tech BBS Trio DataCommWindows HyperTerminal Windows Terminal Trio Fax Send a FaxMicrosoft Fax Select Start Programs Accessories Fax Compose new fax ReferencesMultiModemII User Guide Using the Front Panel Modem Configuration LED IndicatorsUsing the Front Panel Liquid Crystal Display LCDOption Selection Menu StructureMultiModemII User Guide Menu Overview Using the Front Panel Status Trunk MultiModemII User Guide Basic Options Trunk Using the Front Panel Advanced Options Trunk MultiModemII User Guide Remote Configuration Options Trunk Diagnostic Options TrunkUsing the Front Panel Phone Number Memory Options Trunk Caller ID Options TrunkMenu Options StatusUsing the Front Panel Basic Options Advanced Options ImplementedRemote Configuration Options Phone Number Memory Options MultiModemII User Guide Diagnostic OptionsCaller ID Options AT Commands Registers Result Codes Introduction AT Commands AT Commands, S-Registers, and Result CodesEcho Command Mode Characters DS= y Dial Stored Telephone NumberHook Control Information RequestMonitor Speaker Volume Monitor Speaker ModeReturn Online to Data Mode Result Codes Enable/DisableSelect Register Set Register ValueRead Register Value Tone DialingModem Reset Result Code SelectionLong Space Disconnect Data Carrier Detect DCD ControlError Correction Modes Load Factory SettingsData Terminal Ready DTR Control Modem-Initiated Flow Control22bis Guard Tone Control Communications ModeFlow Control Selection Sync/Async Mode Test CommandsClear to Send CTS Control Data Set Ready DSR ControlDisplay Current Configuration Store Current ConfigurationDisplay Last Connection Statistics Synchronous Clock SourceSelect Profile for Hard Reset Line Signal LevelZy =x Store Telephone Number Data Compression ControlLine Signal Quality PCM Code Selection\An Maximum MNP Block Size \Bn Transmit Break\Nn Error Correction Mode Selection \Vn Single Line Connect Message+MS= Modulation Selection Reserved,maxTXrateCRMNP Extended Services Command -SDR=nDistinctive Ring Control Command #CBNy=x Store Callback NumberCommand #CBPy=x Store Callback Password Flash Memory DownloadCommand #CID= n Caller ID Callback Enable/DisableCommand $SBn Serial Port Baud Rate Escape SequenceRegister Unit Range Default Description RegistersS32 S36 S46 Result Codes Terse Verbose DescriptionProtocol ALT +FCERROR MultiModemII User Guide Remote Configuration Setup Basic ProcedureChanging the Remote Configuration Password Remote Configuration Changing the Remote Escape CharacterMultiModemII User Guide Callback Security Setup Procedures Turning Callback Security On and OffAssigning Callback Passwords Callback SecurityAssigning Callback Phone Numbers Callback Security Commands Calling ProcedureCommand #CBN y= x Store Callback Number Command #CBPy=x Store Callback Password Callback Assignments MultiModemII User Guide Leased Line Operation Two-Wire Setup Four-Wire Setup Leased Line OperationDial Backup and Leased Line Restoral Dial Backup and Leased Line Restoral SetupLeased Line Operation MultiModemII User Guide Solving Problems None of the Indicators Light Modem Does Not Respond to Commands Solving ProblemsModem Dials But Cannot Connect Modem4Disconnects While Online Modem4Cannot Connect When Answering File Transfer4Is Slower Than It Should BeThere Are Garbage4 Characters on the Monitor Data Is Being LostModem4Doesn’t Work with Caller ID Fax and Data4Software Can’t Run at the Same Time Appendixes Appendix a Regulatory Compliance FCC Part 68 TelecomFax Branding Statement Regulatory ComplianceInternational Modem Restrictions Canadian Limitations NoticeCommission Decision CTR21 EMC, Safety, and Terminal Directive Compliance New Zealand Telecom Warning NoticeAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Local Analog Loopback Test V.54 Loop Test procedureLoopback Tests Remote Digital Loopback Test V.54 Loop Figure C-2. Remote digital loopback testLocal Digital Loopback Test V.54 Loop Figure C-3. Local digital loopback testBack-to-Back Test Figure C-5. Back-to-back test connections Limited Warranty ServiceOnline Warranty Registration Warranty, Service, and Technical SupportTechnical Support Multi-Tech BBSAbout the Internet Ordering Modem Accessories SupplyNet Online Ordering InstructionsUpgrade Overview Identify the Modem FirmwareIdentify the Current Firmware Version Multi-Tech Web SiteMulti-Tech BBS Upgrading the ModemExtract the Upgrade Files Download the Upgrade FileSet the Modem to the Factory Defaults Upgrade the Modem’s Firmware Restore Your ParametersAppendix F Cable Pinouts RS-232 PinoutsLeased Line Pinouts Cable PinoutsAppendix G Ascii Character Map Ctrl Code Hex DecIndex 108 Index 110

Related manuals

Manual 12 pages 16.1 Kb