3Com DIGITAL MODEM User Manual

Contents

Installing the 3Com Impact Digital Modem 2-3Installing the 3Com Impact Digital ModemThis installation procedure assumes that you are familiarwith IBM and IBM-compatible or Apple Macintoshcomputers. If you are not, refer to the user guide thataccompanied your computer for instructions on hardwareinstallation and operating system commands.Installing the Digital Modem in an IBM-compatible PCTo install the 3Com Impact digital modem model 3C870 or3C872 in an IBM or IBM-compatible computer:1 Turn off the computer.2 Ensure that the 3Com Impact digital modem power switchis in the Off position.3 Insert the 9-pin male end of the 3Com Impact digitalmodem-to-PC serial signal cable into the connectorlabeled Computer on the digital modem’s back panel andtighten the connector screws.4 Connect the other end of the 3Com Impact digitalmodem-to-PC serial signal cable to a serialcommunications (COM) port on the back of your PC andtighten the connector screws.Most COM port connectors are labeled COM, SERIAL, orRS-232-C. On an IBM AT PC and most laptops or notebooks,connect the cable to a 9-pin COM port connector.5 Connect the 3Com Impact digital modem power cable to theconnector marked 12V AC on the back panel of the digitalmodem.See Figure 2-1 for the location of the 12V AC connector onthe digital modem’s back panel.6 Plug the transformer end of the power cable into astandard 117V ac wall outlet.