3Com 3C888 User Guide - Page 21

2 DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION This chapter explains the Dual 56K LAN Modem's key functionality for users who wish to gain a fuller understanding of the LAN Modem before attempting to install and configure the unit. The following topics are covered: s LAN Side Connectivity: Installing an Ethernet Hub s Wan Side: The Two 56K Modems s Using the Modem Channels s Dial-in Functionality s Understanding Multilink PPP and Other Line Usage Options s The Virtual FAX Modem (Windows 95, 98, NT, and 2000) s Support for Virtual Private Networks (VPNs) For a basic understanding of modems and networking, refer to the Networking Primer in Appendix A. LAN Side Connectivity: Installing an Ethernet Hub On the Local Area Network (LAN) side of the Dual 56K LAN Modem, you can connect up to four computers and/or printers directly to the unit's built-in Ethernet hub. This allows you to create a LAN and enable file-, application-, and printer-sharing among the attached devices. By connecting an external hub (not included) to one of the four LAN ports, you can increase the number of users to a total of 25. An example of a ten-workstation connection is shown in Figure 7. Port Status Network Utilization Alert PWR PKTCOLL 1 2 3 4 5 6 7 8 COAX 1% 2% 3% 6% 12% 25% 50% 80% green = link OK, off = link fail, yellow = partition OfficeConnect¤ Ethernet Hub 8 Message MODEM 1 MODEM 2 AA CD RD SD OH AA CD RD SD OH Alert Power LAN Status TX COLL 1 2 3 4 OfficeConnect Dual 56k LAN Modem OfficeConnect¤ Dual 56K LAN Modem Figure 7 Dual 56K LAN Modem Ten Workstation Connection Example.