Data Is Being Lost, 111 | Multi-Tech Systems MT5634ZBAV instruction

7 Solving Problems

Data Is Being Lost

If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate.

Your UART might not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data compression, reset your serial port speed to a lower rate, or replace your serial port with a faster one.

Make sure the flow control method you selected in software match- es the method selected in the modem. If you have a Macintosh, you might have the wrong cable for hardware flow control.

If you are running under Windows 3.1 and have a 16550AFN UART, you might need to turn on the 16550’s data buffers and/or replace

4the Windows serial driver, COMM.DRV.

Try entering the I11 ommand in online mode to display diagnostic information, making a screen print of the diagnostics listing, and checking for parameters that might be unacceptable (number of re- trains, round trip delay, etc.).

4There Are Garbage Characters on the Monitor

Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communications software.

You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again; you might get a better connection

4the second time.

At speeds above 2400 bps, the remote modem might not use the same transmission or error correction standards as your modem. Try

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Multi-Tech Systems MT5634ZBAV manual Data Is Being Lost, 111

Contents

Model MT5634ZBA Model MT5634ZBAV Page Model MT5634ZBA Model MT5634ZBAV Models MT5634ZBA and MT5634ZBAV Contents User Guide Features Vii Callback Security Viii Appendix C Loopback Tests 145 User Guide Introduction Page Introduction Introduction Product Description What Is in Your Modem Package? Related Manuals User Guide Quick Start Page What You Will Need IntroductionQuick Start We supply Safety Warnings Mounting the feet Assemble the Modem Opening the Modem Change the Internal Jumpers Internal jumpers MT5634ZBAV Changing the Dial-Up/Leased-Line Jumpers User Guide Changing the Speaker Jumper Modem connections Connect the Modem to Your System Line Connection User Guide RS232 ConnectionPhone Connection Microphone Connection MT5634ZBAV only Power-On Test Power ConnectionQuick Start Speaker Connection MT5634ZBAV only Adding the Modem to Windows 95 or NT Install the Modem in Windows Removing Your Old Modem from Windows 95 or NT Install and Configure Your Software Quick Start User Guide Windows 95 HyperTerminal Call the Multi-Tech BBS Windows Terminal Quick Start Send a Fax Select Start Programs Accessories Fax Compose new fax Other Ways to Access Microsoft Fax Voice Mail Test Test the MT5634ZBAV Voice CircuitsLoopback Test AT+FCLASS=8 AT+VLS=7 Speakerphone Test References Features Page What Can You Do with Your Modem? Features Data Features Voice MT5634ZBAV only Fax Computer Required EquipmentSerial Cable Communications Software Features Telephone Line Connections Connecting to the Computer RS232 Connecting to a Telephone Set Phone Features Connecting to the Telephone Line LineConnecting to a Microphone MIC Connecting to a Sound Card Spkr Connecting to a Speaker SpkrConnecting to Power PWR Surge Protectors and Lightning Front Panel 56 56K Mode 56,000-32,000 bps. The 56 LED lights whenever Features User Guide AT Commands Registers Result Codes Page AT Commands, S-Registers, and Result Codes AT Commands Enter Key AT Command SummaryAnswer Communication Standard Setting Repeat Last CommandCarrier Control Dial DS=y Dial Stored Telephone Number ATDT1028806127853500$123456789 Echo Online Data Characters Echo Command Mode CharactersHook Control Information Request Monitor Speaker Mode Monitor Speaker VolumeModulation Handshake Result Codes Enable/Disable Return Online to Data ModePulse Dialing Set Register Value Tone Dialing Sr? Read Register ValueResult Code Format Result Code Options Long Space Disconnect Modem Reset Data Carrier Detect DCD Control Auto RetrainData Terminal Ready DTR Control Communications Mode Load Factory Settings22bis Guard Tone Control Auxiliary Relay Control Test Commands Asynchronous Communications ModeData Set Ready DSR Control Store Current Configuration Display Current SettingsSelect Stored Configuration for Hard Reset Speaker Codec Loopback Zy=x Store Dialing Command\An Select Maximum MNP Block Size \Bn Transmit Break \Jn Data Buffer Control \Gn Modem Port Flow ControlBreak Control \Nn Error Correction Mode Selection \Qn Flow Control Selection \Tn Inactivity Timer\Vn Protocol Result Code Data Calling Tone \Xn XON/XOFF Pass-ThroughView Numbers in Blacklist Data Compression Control $Dn DTR Dialing DCn AT Command Control$EBn #CBDn Callback Delay +ES=n Enable Synchronous Buffered ModeCommand #CBF? Callback Failed Attempts Display #CBAn Callback Attempts #CBIn Local Callback Inactivity Timer Callback Failed Attempts ResetCommand #CBNy=x Store Callback Password #CBPn Callback Parity Callback Enable/Disable Callback Security ResetEnter Setup Password Command #S=x Store Setup Password +++ATCR Escape Sequence Registers Register Unit Range Default Description S11 S10S28 S35 S37 Register Unit Range Default Description S36 S42 Register Unit Range Default Description S38S43 S48 Register Unit RangeS89 S108 Terse Verbose Description Result Codes Delayed Remote Configuration Page Remote Configuration Basic Procedure Changing the Setup Password Setup Remote Configuration Changing the Remote Escape Character User Guide Callback Security Page Callback Security Setup Procedures To Turn Callback Security On and Off User Guide To Change the Setup Password To Set the Parity of the Callback Security Messages To Assign Callback Passwords and Phone Numbers Callback Security Password-Only Callback Calling Procedures Number-Entry Callback Extension-Entry Callback Direct Connection Callback Security Commands #CBFR Command #CBPn #CBS0 Zy=+-x,???Store Dialing Command Only after the setup password has been entered 100 Solving Problems Page Solving Problems None of the Indicators Light103 104 Modem Does Not Respond to Commands 105 106 107 Modem Dials But Cannot Connect 108 109 4The Modem Disconnects While Online 110 File Transfer Is Slower Than It Should Be 111 Data Is Being Lost Fax and Data Software Can’t Run at the Same Time 4The Modem Doesn’t Work with Caller ID112 Appendixes Page Regulatory Compliance FCC Regulations for Telephone Line Interconnection115 116 117 Canadian Limitations Notice 118 FCC Fax Update 119 Compliance with Babt Requirements European Low Voltage Directive EMC and Safety Compliance120 Register Default Command DefaultAustralian Modem Warning Notice 121 122 Use of Supplied Power Transformer 123 New Zealand Telecom Warning Notice 124 Technical Specifications Mode of Operation Error CorrectionIntelligent Features Command Buffer ITU-T Carrier FrequenciesAT&T V.32 terbo ITU-T V.32bis/V.32 Carrier Frequencies 22bis/V.22 or Bell 103/113 ConnectorsFax Carrier Frequencies Indicators DiagnosticsPower Requirements Power Consumption 130 131 Loopback Tests Local Analog Loopback Test V.54 Loop Test procedure132 133 Remote Digital Loopback Test V.54 Loop 134 User Guide Test procedure 135 Local Digital Loopback Test V.54 Loop 136 Warranty, Service, and Technical Support Limited Warranty137 Technical Support ServiceMulti-Tech Systems, Inc Woodale Drive Mounds View, MN Attn Repair Multi-Tech BBS Online Warranty Registration139 If you don’t know the file name If you know the file name140 141 About the Internet About CompuServe About the Multi-Tech Fax-Back Service142 Upgrade Procedures Upgrade Overview143 Identify the Current Firmware Version Identify the Modem FirmwareMulti-Tech Web Site 144 145 Multi-Tech BBS 146 Download the Upgrade File Clear Your Stored Paramenters Extract the Upgrade Files147 148 Upgrade the Modem’s Firmware 149 Flashwin 150 Restore Your Parameters Index Page 153 Index 47, 70 154 20, 21 155 156 Enable Synchronous Buffered Mode 157 Modem Port Flow Control command 20, 55 158 159 Store Telephone Number command 160 User Guide