3Com Changing The Parameter Settings, Send the command AT $B 230400 to the 3C882 Isdn modem

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Changing The Parameter Settings

5-4

To access the 3C882 Conﬁguration dialog box, Autobaud must be enabled. If the baud rate is set to a speciﬁc rate, you will not be able to access the Conﬁguration dialog box. Before setting a speciﬁc baud rate, ensure that the Conﬁguration dialog box parameters are set appropriately.

To set the baud rate to the maximum of 230.4 Kbps, do the following:

1Ensure that your computer’s COM port and communications software support 230.4 Kbps.

2Send the command AT $B 230400 to the 3C882 ISDN modem.

For instructions on how to send AT commands, refer to the section “Changing The Parameter Settings”.

3Change the setting of your application program to 230400 bps.

This completes the procedure to change the baud rate to 230.4 Kbps.

Changing The Parameter Settings

To change parameter settings:

1Launch your communications or terminal emulation software.

Be sure your communications software is in terminal mode.

2Be sure the 3C882 ISDN modem is in command mode (sometimes called local mode or terminal mode) so that it interprets your commands.

When your computer is powered on, the 3C882 ISDN modem automatically starts in command mode. If you have recently used the 3C882 ISDN modem to make a call and have not yet disconnected, type +++ to switch to command mode.

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Contents 3COMIMPACT IQ External Isdn Modem User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Year Limited Warranty Contents Conﬁguring Multilink PPP Placing Isdn Data CallsAT&T 5ESS Custom Switch A-4 RegistersWorld Wide Web Site Support from 3Com E-4 Returning Products for Repair E-4Figures Main 3C882 Conﬁguration Steps for a Macintosh Tables Pin DescriptionsHow to Use This Guide Advanced configuration ChapterAbout this Guide IntroductionConventions Network Access with the 3C882 Isdn Modem IntroductionEasy Installation and Use 3C882 Isdn Modem Features3C882 Isdn modem provides the following features High Performance ProtocolsIsdn Standards and Interface Ansi V.120 rate adaptionVoice Features DiagnosticsWarranty Security3C882 Isdn Modem Package Contents Before You Install the 3C882 Isdn ModemIBM PC or Compatible Requirements Apple Macintosh RequirementsIsdn Switch Type Isdn InformationIsdn Information Sheet 3ComImpact IQ Isdn ModemBefore You Install the 3C882 Isdn Modem Installing the 3C882 Main hardware installation steps are depictedFront Panel LED Indicators Familiarizing Yourself with the 3C882 Isdn ModemFront Panel LED Indicator Deﬁnitions As power is supplied to the unitColor Description GreenInstalling a Serial Cable You will need the following type of serial cableInstalling the Isdn Cable Installing Analog Equipment Analog Equipment ConnectionInstalling Analog Equipment Installing the Power Cable Power Cable ConnectionConfiguration for AN IBM-COMPATIBLE PCConﬁguring the 3C882 Isdn Modem for a PC Main steps are shown in FigureTo install the 3C882 Isdn modem software Installing the 3C882 SoftwareClick OK Double-click the 3ComImpact IQ 3.0 icon shown in Figure Running Spid WizardYou will see a start message, as shown in Figure First Telephone Number Dialog Box for PC Second Telephone Number Dialog Box for PC Click Finish Conﬁguration dialog box buttons do the followingConfiguring the 3C882 Isdn Modem for a PC Conﬁguring Multilink PPP Appears Click FinishConﬁguring the B Channel Rate Conﬁguring Voice Call RoutingConfiguring the 3C882 Isdn Modem for a PC Verifying the Conﬁguration 11 Conﬁguration for One Telephone Number & Two DevicesConfiguring the 3C882 Isdn Modem for a PC Setup Using Windows 12 New Hardware Dialog Box13 Install From Disk Dialog Box 15 Install New Modems Dialog Box 16 Modem Manufacturers and Models Dialog Box Setup Using Windows NT RAS 17 Network Settings Dialog Box 18 Remote Access Setup Dialog BoxRemote Access Setup dialog box appears Conﬁgure Port dialog box appearsConfiguration for AN Apple Macintosh Computer Conﬁguring the 3C882 Isdn Modem for a Macintosh ComputerMessage box appears Click Continue. -3 appearsClick OK This completes the software installation procedure Click Continue. -4 appears3ComImpact IQ Program Icon Select Modem Port ScreenSpid Wizard Start Screen 10 First Telephone Number Screen for Macintosh 11 Second Telephone Screen for Macintosh 12 Successful Conﬁguration Screen Quit. Click Quit to leave the Conﬁguration dialog box Configuring the 3C882 Isdn Modem for a Macintosh Computer 15 Conﬁguration for One Telephone Number per Device Verifying the Conﬁguration Configuring the 3C882 Isdn Modem for a Macintosh Computer Advanced Configuration Advanced Conﬁguration Parameter Default ValuesDBA Auto Answer Baud RateChanging The Parameter Settings Send the command AT $B 230400 to the 3C882 Isdn modemAuto Answer Disabled Autobaud EnabledType AnswerCalls Placing and ReceivingPlacing Isdn Data Calls Placing Calls Automatically Placing Calls ManuallyPlacing Multilink PPP Calls Placing a 56K TollSaver Call An example is as follows ATD 1 908 555 1212 & 1 908 555When the 3C882 Isdn modem receives a voice call, Receiving Isdn Data CallsAn example is as follows Atdd 1 908 555 Channels ﬂash and then remain litPlacing Voice Calls Using an Analog Phone Port Receiving Voice Calls Using an Analog Phone PortTroubleshooting Checking the BasicsMonitoring the Test LED Monitoring LEDsMonitoring the D Channel LED Evaluating Symptoms and Solutions Monitoring the B Channel LEDsSymptom Possible Cause Solution LED remains lit Properly configured You receive aCannot be sent Upon power up Previous firmware Do not remain Or application software orUsing On-Line Help Finding More Information Contacting Technical SupportDownloading Firmware to Your 3C882 Isdn Modem Following on-line help is availableOrdering Isdn Service Placing the Isdn Order Through 3ComPlacing the Isdn Order Through Your Telephone Company Give the representative the 3C882 Isdn modem Isdn codeTable A-1 Isdn Order Codes Number of Telephone Numbers Package K Package USwitch Circuit-switched DataTelephone company with the information provided Table A-2Switch To order Isdn service for the Northern Telecom DMS Switch, supply the telephone company with the informationProvided in Table A-4 DynamicEwsd Key System Ekts Flexible Call Offering FCO Yes †AT Commands REGISTERS, and Result Codes AT Command SetHost computer default Answer mode only\Q0 disables flow control Hardware flow control defaultSettings AT \S Reset AT Z+++ Enter command state \T0 disables inactivity timer defaultRegisters Registers except S0 are the 3Com extended registersIsdn Default S65 Isdn Caller ID for Voice Calls for Phone Port S75 Connection Delay Result Codes Table B-3 lists the 3C882 Isdn modem result codesSpecifications 3C882 Isdn Modem SpeciﬁcationsRS-232 COM Port Pin Speciﬁcations Clear to Send CTS From Isdn modemMacintosh Serial Cable Pin Speciﬁcations PC Serial Cable Pin SpeciﬁcationsReceive Data RD Send Data SD Conﬁguration Using DOS Configuration UsingTo copy the README.TXT ﬁle, at the C\3Com prompt, type Use the Space Bar to select the 3C882 Isdn modem’s COM port Configuration Using DOS 3Com Bulletin Board Service On-line Technical ServicesTechnical Support World Wide Web Site Call the telephone number nearest you3ComFacts Automated Fax Service 3ComForum on CompuServeTo use 3ComForum Log on to CompuServe Press Return to see the 3ComForum main menuU.S. and Canada, call 800 876 3266 for customer service Support from Your Network SupplierSupport from 3Com Returning Products for RepairAsync-Sync PPP Conversion GlossaryChannel COM port Isdn LayerPlain old telephone service 120Analog equipment installation 2-6 analog port IndexNumerics Apple macintosh requirements 1-6 Async-Sync PPPData Using AT commands 6-2 voice Registers B-4 Serial cable installationDMS 100 A-5 Result codes B-8Index Limited Warranty Santa Clara, CA 95052-8145 408 3COM END User Software License Agreement For civilian agencies Interference Handbook Canadian Notice  1996, 3Com Corporation