3Com 3C882 manual COM port, Compression

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GLOSSARY 2

COM port

The communications port (also referred to as a serial port). The 3C882 ISDN modem communications port allows a maximum baud rate of 230.4 Kbps. Note that most computer COM ports only allow a maximum of 115.2 Kbps. However, accelerator cards can be purchased to increase the computer’s COM port rate to 230.4 Kbps.

Compression

Compression is a method of reducing the size of data packets without losing any information. The 3C882 ISDN modem automatically compresses data for PPP calls 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.

D channel

The signaling channel on an ISDN line used to carry messages between the 3C882 ISDN modem and the public switch.

DBA

Dynamic bandwidth allocation. DBA is a method of reallocating bandwidth (such as a B channel) automatically. DBA allows you to place or receive a voice call while a Multilink PPP call is active.

Default

Value set at the factory.

Firmware

Firmware is the code which resides in the 3C882 ISDN modem and controls its behavior. It differs from software in the form of programs that run on your computer.

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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 DescriptionsAbout this Guide How to Use This GuideAdvanced configuration Chapter IntroductionConventions Network Access with the 3C882 Isdn Modem Introduction3C882 Isdn Modem Features Easy Installation and Use3C882 Isdn modem provides the following features Isdn Standards and Interface High PerformanceProtocols Ansi V.120 rate adaptionWarranty Voice FeaturesDiagnostics Security3C882 Isdn Modem Package Contents Before You Install the 3C882 Isdn ModemIBM PC or Compatible Requirements Apple Macintosh RequirementsIsdn Information Sheet Isdn Switch TypeIsdn Information 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 ModemColor Description Front Panel LED Indicator DeﬁnitionsAs power is supplied to the unit 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 ConnectionConﬁguring the 3C882 Isdn Modem for a PC Configuration for ANIBM-COMPATIBLE PC Main steps are shown in FigureInstalling 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 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 modemType Auto Answer DisabledAutobaud Enabled AnswerPlacing and Receiving CallsPlacing 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 555An example is as follows Atdd 1 908 555 When the 3C882 Isdn modem receives a voice call,Receiving Isdn Data Calls Channels ﬂash and then remain litPlacing Voice Calls Using an Analog Phone Port Receiving Voice Calls Using an Analog Phone PortTroubleshooting Checking the BasicsMonitoring LEDs Monitoring the Test LEDMonitoring the D Channel LED Evaluating Symptoms and Solutions Monitoring the B Channel LEDsCannot be sent Upon power up Previous firmware Symptom Possible Cause SolutionLED remains lit Properly configured You receive a Do not remain Or application software orDownloading Firmware to Your 3C882 Isdn Modem Using On-Line HelpFinding More Information Contacting Technical Support Following on-line help is availablePlacing the Isdn Order Through Your Telephone Company Ordering Isdn ServicePlacing the Isdn Order Through 3Com Give the representative the 3C882 Isdn modem Isdn codeTable A-1 Isdn Order Codes Number of Telephone Numbers Package K Package UTelephone company with the information provided SwitchCircuit-switched Data Table A-2Switch Provided in Table A-4 To order Isdn service for the Northern Telecom DMSSwitch, supply the telephone company with the information DynamicEwsd Key System Ekts Flexible Call Offering FCO Yes †AT Commands REGISTERS, and Result Codes AT Command Set\Q0 disables flow control Host computer defaultAnswer mode only Hardware flow control default+++ Enter command state Settings AT \SReset AT Z \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 modemPC 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 World Wide Web Site Call the telephone number nearest youTo use 3ComForum Log on to CompuServe 3ComFacts Automated Fax Service3ComForum on CompuServe Press Return to see the 3ComForum main menuSupport from 3Com U.S. and Canada, call 800 876 3266 for customer serviceSupport from Your Network Supplier Returning Products for RepairGlossary Async-Sync PPP ConversionChannel COM port Isdn LayerPlain old telephone service 120Numerics Analog equipment installation 2-6 analog portIndex Apple macintosh requirements 1-6 Async-Sync PPPDMS 100 A-5 Data Using AT commands 6-2 voiceRegisters B-4 Serial cable installation 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