Multi-Tech Systems MT5600BA, MT5600BL manual Dial Backup and Leased Line Restoral

Page 80

MultiModemII User Guide

Dial Backup and Leased Line Restoral

For four-wire leased line operation, the MT5600BL modem has dial backup, in which the modem is connected to a standard dial-up line as well as to the leased line. If the leased line fails, the originate modem automatically dials and connects to the answer modem through the standard telephone network. While it is in dial back- up mode, the MT5600BL periodically checks the leased line to see if it is operational. If the line is operational, the modem then attempts to restore the leased line.

The dial-back timer, register S17, determines how long the modem waits after a leased line failure before it attempts a dial backup connection. The S17 default set- ting is one minute. During that minute, the originate modem tries to establish the leased line link. If the leased line is established during that time, the S17 timer is cleared and everything is back to normal. If the timer expires, the modem attempts a dial backup connection. The purpose of the timer for the answer modem is to deter- mine when it can accept a dial-up call. Dial-back starts only when both timers have expired and the leased line is still down.

The restore timer, register S15, determines how frequently restoral attempts occur when the modems are in dial backup mode. S15 can be set from 10 to 255 minutes in one minute increments. The default value is 30 minutes.

Note: Register S15 must be set identically on both the local and remote modems.

The dial backup number must be set from the front panel of the modem.

Dial Backup and Leased Line Restoral Setup

1.Connect a modular telephone cable to the LINE jack of an MT5600BL modem set up for four-wire leased line operation. Connect the other end of the cable to a standard dialup line jack.

2.Turn on the modem.

3.Starting at the STATUS screen, press the following buttons on the front panel: , , ◊, , ◊, ◊, ◊. The ENTER NUMBER screen appears.

4.Press the 〈⇓ or button several times to select the first digit in the dial backup telephone number.

5.Press the ◊ button to go to the next digit in the number.

Note: To backspace or to cancel an entry, press ◊ several times.

6.The number can be up to 30 characters in length. Repeat steps 4 and 5 until the number is entered, and then press the Enter button to store it. The DIAL BACK- UP # STORED screen appears.

7. Press the Enter button again to go to the DIAL BACKUP NUMBER screen.

Note: Steps 8 through 15 are optional.

8.To change the default restore time, press , ◊, ◊. The ENTER TIME IN MINUTES screen appears.

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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 Product Description FeaturesIntroduction 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 TestRemoving Your Old Modem from Windows Install the Modem in WindowsAdding the Modem to Windows Install and Configure Your Software Call the Multi-Tech BBS Trio DataCommWindows HyperTerminal Windows Terminal Microsoft Fax Send a FaxTrio 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 Caller ID Options MultiModemII User Guide Diagnostic OptionsPhone Number Memory 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 ControlFlow Control Selection Communications Mode22bis Guard Tone Control 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 Changing the Remote Configuration Password Basic ProcedureSetup 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 Command #CBN y= x Store Callback Number Calling ProcedureCallback Security Commands 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 BeModem4Doesn’t Work with Caller ID Data Is Being LostThere Are Garbage4 Characters on the Monitor Fax and Data4Software Can’t Run at the Same Time Appendixes Appendix a Regulatory Compliance FCC Part 68 TelecomFax Branding Statement Regulatory ComplianceCommission Decision CTR21 Canadian Limitations NoticeInternational Modem Restrictions EMC, Safety, and Terminal Directive Compliance New Zealand Telecom Warning NoticeAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Loopback Tests Test procedureLocal Analog Loopback Test V.54 Loop 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 ModemSet the Modem to the Factory Defaults Download the Upgrade FileExtract the Upgrade Files 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
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