2 DUAL 56K LAN MODEMFUNCTIONALITY DESCRIPTIONThis chapter explains the Dual 56K LAN Modem’s key functionality for users whowish to gain a fuller understanding of the LAN Modem before attempting toinstall and configure the unit. The following topics are covered: LAN Side Connectivity: Installing an Ethernet Hub Wan Side: The Two 56K Modems Using the Modem Channels Dial-in Functionality Understanding Multilink PPP and Other Line Usage Options The Virtual FAX Modem (Windows 95, 98, NT, and 2000) Support for Virtual Private Networks (VPNs)For a basic understanding of modems and networking, refer to the NetworkingPrimer in Appendix A.LAN Side Connectivity:Installing an EthernetHubOn the Local Area Network (LAN) side of the Dual 56K LAN Modem, you canconnect up to four computers and/or printers directly to the unit’s built-in Ethernethub. This allows you to create a LAN and enable file-, application-, andprinter-sharing among the attached devices. By connecting an external hub (notincluded) to one of the four LAN ports, you can increase the number of users to atotal of 25. An example of a ten-workstation connection is shown in Figure 7.Figure 7 Dual 56K LAN Modem Ten Workstation Connection Example.OfficeConnect ¤Dual 56K LAN ModemOfficeConnect ¤Ethernet Hub 8Alert PowerMessageRDAA CD SD OH RDAA CD SD OHOfficeConnect Dual 56k LAN Modem1TX COLL 2 3 4LAN StatusMODEM 2MODEM 1Alert PWR COLLPKT COAX1 2 3 4green = link OK, off = link fail, yellow = partitionPort Status5 6 7 8 1% 2% 3% 6% 12% 25% 50% 80%Network Utilization
