3Com DIGITAL MODEM User Manual

Contents

Computer System Requirements 1-7Computer System Requirements* Two directory numbers are required for Models 3C872 and 3C877. This allows a voice call and acall using the internal analog fax modem to occur at the same time.Connect the model 3C871 or 3C872 3Com Impact digitalmodem to an IBM-compatible computer. Connect the model3C876 or 3C877 3Com Impact digital modem to an AppleMacintosh computer. Connect the digital modem to acomputer that meets UL standards in the United States or iscertified to CSA standards in Canada.Table 1-1 ISDN Ordering Information by Switch TypeISDN Switch TypeISDN LineConfigurationParameterAT&T‚ 5ESSCustomAT&T 5ESSNationalISDN-1NorthernTelecom‚DMS100NationalISDN-1Siemens‚EWSDNationalISDN-1Line Code 2B1Q (no NT1required)2B1Q (no NT1required)2B1Q (no NT1required)2B1Q (no NT1required)DirectoryNumbers1* 1* 2 1*Channels 2B alternatecircuit-switcheddata and voice2B alternatecircuit-switcheddata and voice2B alternatecircuit-switcheddata and voice2B alternatecircuit-switcheddata and voiceTerminal Type A withPoint-to-PointA withPoint-to-PointFunctional PVC 2 FunctionalTEI Dynamic Dynamic Dynamic DynamicCallAppearancesIdle Idle — —SupplementalVoice FeaturesNone None None NoneEKTS Features No No No NoD ChannelPacketNo No No NoB ChannelPacketNo No No No