3Com 3C882 manual Auto Answer, Baud Rate

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Advanced Configuration Parameter Default Values

5-3

Auto Answer

When Auto Answer is disabled (the default), a RING message is delivered to the RS-232 port upon reception of an incoming data call to the 3C882 ISDN modem. Enter the command AT A to answer the incoming data call. A CONNECT message is then delivered to the RS-232 port upon successful connection.

If Auto Answer is enabled, the call is automatically answered after the number of rings you specify, and a CONNECT message, indicating the speed of the connection, is delivered to the RS-232 port.

Compression

Compression is a method of reducing the size of data without losing any information. The 3C882 ISDN modem automatically compresses data to improve data transfer times using the Stac compression method. The following check modes are negotiable— None, One Byte Sequence Number, and Extended. Extended is the preferred choice. The degree of compression depends on the type of ﬁle being transferred. For example, a text-only ﬁle compresses better than a ﬁle with graphics.

Compression is enabled (default) and will automatically be invoked unless you are running compression on your computer. If you are running compression on your computer, that compression method will be used instead of 3C882 compression even if 3C882 compression is enabled.

Baud Rate

By default, the baud rate is set using Autobaud. Autobaud automatically detects the maximum data rate of your computer’s COM port. Rates up to 115.2 Kbps can be detected automatically. 3Com recommends that you leave Autobaud enabled unless you want to set the baud rate to

230.4Kbps. The command AT $B (baud rate) is used to set a speciﬁc baud rate, such as 230.4 Kbps. Refer to Appendix B for a list of acceptable values.

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Contents 3COMIMPACT IQ External Isdn Modem User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Year Limited Warranty Contents Placing Isdn Data Calls Conﬁguring Multilink PPPRegisters AT&T 5ESS Custom Switch A-4Support from 3Com E-4 Returning Products for Repair E-4 World Wide Web SiteFigures Main 3C882 Conﬁguration Steps for a Macintosh Pin Descriptions TablesIntroduction How to Use This GuideAdvanced configuration Chapter About this GuideConventions Introduction Network Access with the 3C882 Isdn Modem3C882 Isdn Modem Features Easy Installation and Use3C882 Isdn modem provides the following features Ansi V.120 rate adaption High PerformanceProtocols Isdn Standards and InterfaceSecurity Voice FeaturesDiagnostics WarrantyBefore You Install the 3C882 Isdn Modem 3C882 Isdn Modem Package ContentsApple Macintosh Requirements IBM PC or Compatible Requirements3ComImpact IQ Isdn Modem Isdn Switch TypeIsdn Information Isdn Information SheetBefore You Install the 3C882 Isdn Modem Main hardware installation steps are depicted Installing the 3C882Familiarizing Yourself with the 3C882 Isdn Modem Front Panel LED IndicatorsGreen Front Panel LED Indicator DeﬁnitionsAs power is supplied to the unit Color DescriptionYou will need the following type of serial cable Installing a Serial CableInstalling the Isdn Cable Analog Equipment Connection Installing Analog EquipmentInstalling Analog Equipment Power Cable Connection Installing the Power CableMain steps are shown in Figure Configuration for ANIBM-COMPATIBLE PC Conﬁguring the 3C882 Isdn Modem for a PCInstalling the 3C882 Software To install the 3C882 Isdn modem softwareClick OK Running Spid Wizard Double-click the 3ComImpact IQ 3.0 icon shown in FigureYou will see a start message, as shown in Figure First Telephone Number Dialog Box for PC Second Telephone Number Dialog Box for PC Conﬁguration dialog box buttons do the following Click FinishConfiguring the 3C882 Isdn Modem for a PC Appears Click Finish Conﬁguring Multilink PPPConﬁguring Voice Call Routing Conﬁguring the B Channel RateConfiguring the 3C882 Isdn Modem for a PC 11 Conﬁguration for One Telephone Number & Two Devices Verifying the ConﬁgurationConfiguring the 3C882 Isdn Modem for a PC 12 New Hardware Dialog Box Setup Using Windows13 Install From Disk Dialog Box 15 Install New Modems Dialog Box 16 Modem Manufacturers and Models Dialog Box Setup Using Windows NT RAS 18 Remote Access Setup Dialog Box 17 Network Settings Dialog BoxConﬁgure Port dialog box appears Remote Access Setup dialog box appearsConﬁguring the 3C882 Isdn Modem for a Macintosh Computer Configuration for AN Apple Macintosh ComputerClick Continue. -3 appears Message box appearsClick Continue. -4 appears Click OK This completes the software installation procedureSelect Modem Port Screen 3ComImpact IQ Program IconSpid 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 Parameter Default Values Advanced ConfigurationDBA Baud Rate Auto AnswerSend the command AT $B 230400 to the 3C882 Isdn modem Changing The Parameter SettingsAnswer Auto Answer DisabledAutobaud Enabled TypePlacing and Receiving CallsPlacing Isdn Data Calls Placing Calls Manually Placing Calls AutomaticallyPlacing Multilink PPP Calls An example is as follows ATD 1 908 555 1212 & 1 908 555 Placing a 56K TollSaver CallChannels ﬂash and then remain lit When the 3C882 Isdn modem receives a voice call,Receiving Isdn Data Calls An example is as follows Atdd 1 908 555Receiving Voice Calls Using an Analog Phone Port Placing Voice Calls Using an Analog Phone PortChecking the Basics TroubleshootingMonitoring LEDs Monitoring the Test LEDMonitoring the D Channel LED Monitoring the B Channel LEDs Evaluating Symptoms and SolutionsDo not remain Or application software or Symptom Possible Cause SolutionLED remains lit Properly configured You receive a Cannot be sent Upon power up Previous firmwareFollowing on-line help is available Using On-Line HelpFinding More Information Contacting Technical Support Downloading Firmware to Your 3C882 Isdn ModemGive the representative the 3C882 Isdn modem Isdn code Ordering Isdn ServicePlacing the Isdn Order Through 3Com Placing the Isdn Order Through Your Telephone CompanyNumber of Telephone Numbers Package K Package U Table A-1 Isdn Order CodesTable A-2 SwitchCircuit-switched Data Telephone company with the information providedSwitch Dynamic To order Isdn service for the Northern Telecom DMSSwitch, supply the telephone company with the information Provided in Table A-4Key System Ekts Flexible Call Offering FCO Yes † EwsdAT Command Set AT Commands REGISTERS, and Result CodesHardware flow control default Host computer defaultAnswer mode only \Q0 disables flow control\T0 disables inactivity timer default Settings AT \SReset AT Z +++ Enter command stateRegisters except S0 are the 3Com extended registers RegistersIsdn Default S65 Isdn Caller ID for Voice Calls for Phone Port S75 Connection Delay Table B-3 lists the 3C882 Isdn modem result codes Result Codes3C882 Isdn Modem Speciﬁcations SpecificationsClear to Send CTS From Isdn modem RS-232 COM Port Pin SpeciﬁcationsPC Serial Cable Pin Speciﬁcations Macintosh Serial Cable Pin SpeciﬁcationsReceive Data RD Send Data SD Configuration Using Conﬁguration Using DOSTo 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 On-line Technical Services 3Com Bulletin Board ServiceTechnical Support Call the telephone number nearest you World Wide Web SitePress Return to see the 3ComForum main menu 3ComFacts Automated Fax Service3ComForum on CompuServe To use 3ComForum Log on to CompuServeReturning Products for Repair U.S. and Canada, call 800 876 3266 for customer serviceSupport from Your Network Supplier Support from 3ComGlossary Async-Sync PPP ConversionChannel COM port Layer Isdn120 Plain old telephone serviceApple macintosh requirements 1-6 Async-Sync PPP Analog equipment installation 2-6 analog portIndex NumericsResult codes B-8 Data Using AT commands 6-2 voiceRegisters B-4 Serial cable installation DMS 100 A-5Index Limited Warranty Santa Clara, CA 95052-8145 408 3COM END User Software License Agreement For civilian agencies Interference Handbook Canadian Notice  1996, 3Com Corporation