3Com 3C888 User Guide - Page 22

22 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION Wan Side: The Two 56K Modems Using the Modem Channels On the Wide Area Network (WAN) side of the Dual 56K LAN Modem, up to 25 users can share access to the WAN through use of the LAN Modem's two internal 56K modems. When you configure the Dual 56K LAN Modem, you can choose one of two ways to use two analog lines: s Two separate connections to different locations (one per analog line, or "channel") s One high-speed connection at a time, using Multilink Point-to-Point Protocol (Multilink PPP) to combine the two analog channels into one. For an explanation of Multilink PPP, refer to "Understanding Multilink PPP and Other Line Usage Options" later in this chapter. Once a WAN connection is established, up to 25 users can share the open connection and access the same location simultaneously. When you use the Dual 56K LAN Modem for its most common WAN application, dial-out remote access, you can configure up to four remote destination profiles, referred to as Service Providers. For each Service Provider that you configure, you can choose whether to set up the connection as a single analog "channel" connection, or as a Multilink-enabled connection. If two or more Service Providers are set up in the LAN Modem, each as a single channel connection, the following typical dial-out scenario becomes possible, as shown in Figure 8. Greg's PC Marsha's PC Peter's PC 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 Greg Peter Two analog lines Greg Public telephone network Peter Internet 3 Com From the EodfgtheetoNtehtewoHreka. rt Jan's PC Remote Private Network Figure 8 Two Simultaneous Dial-out Connections to Two Different Remote Locations