3Com DIGITAL MODEM User Manual

Contents

3Com Impact Digital Modem Features 1-3The 3Com Impact digital modem can be connected to anycompatible UL‚-listed IBM AT‚-compatible or Apple Macintoshpersonal computer that includes instructions for the installationof hardware and software options to serial ports.3Com Impact Digital Modem FeaturesThe 3Com Impact digital modem provides the following:n A complete digital network termination (Basic Rate ISDN NT1).n Full ISDN signaling support of National ISDN andpre-National ISDN service offerings.n An asynchronous RS-232-C data port for connectivity to IBMor compatible PC and Apple Macintosh serial ports at rates ofup to 115.2 Kbps.n AT command set dialing.n Interoperability support through standard protocols likePoint-to-Point Protocol (PPP) and V.120. (V.120 is a rateadaption scheme to convert transmission rates from a rangeof 50 bps to 19.2 Kbps to the B channel 64 Kbps rate.)n Multilink PPP support, which allows the two B channels to bevirtually linked, thereby allowing a maximum digitalconnection of 128 Kbps.n Dynamic bandwidth allocation (DBA), which allows you toplace a voice call while a Multilink PPP call is active.n Internal 14.4 Kbps analog fax modem (V.32bis compliant) forconnection to non-ISDN fax machines and modems (appliesto 3C872 and 3C877 models only).n An analog voice port for attaching analog telephones,answering devices, and fax machines to the ISDN line.n A graphical user interface for digital modem configuration.n A comprehensive diagnostic test and LED status display.n One-year limited warranty within the “Other HardwareProducts” category of the 3Com Limited Warranty at the endof this guide.