ABOUT THIS GUIDEIntroductionThis guide describes how to install, operate, andtroubleshoot the 3ComImpact IQ External ISDN Modem,referred to throughout this guide as the 3C882 ISDN modem.Be sure to read the README.TXT or readme files on theapplicable software utility diskette for the latest productinformation.How to Use This GuideThe following table shows where to find specific informationin this guide.If you are looking for: Turn to:General information Chapter 1Instructions for installation Chapter 2Instructions for configuration for an IBM or compatible PC Chapter 3Instructions for configuration for a Macintosh computer Chapter 4Advanced configuration Chapter 5Information on supplementary voice features Chapter 6Instructions for placing and receiving data and voice calls Chapter 7Troubleshooting tips Chapter 8Instructions for ordering ISDN service Appendix ATabular summary of the AT command line set, S registers,and result codesAppendix B3C882 ISDN modem specifications Appendix CInstructions for configuration using DOS Appendix D