3Com Dual 56K User Manual

Also see for 3C888 - OfficeConnect Dual 56K LAN Modem Router: Getting started guide

Contents

3Com Dual 56K User Manual Manual pdf 28 page image

28 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTIONWhen this option is configured, both modem channels are used every time aconnection is made to a remote destination, regardless of the amount of trafficbeing generated. The DBA feature is not utilized, because both channels areused for every call. Make sure that your remote destination supports thisfunctionality. Add Second Channel As Required (recommended)When this option is configured (referred to as bandwidth on demand), initiallyone modem channel is used to connect to a remote destination, and thesecond channel is automatically added when the amount of traffic on the firstchannel reaches a threshold that you define. When you choose Add SecondChannel as Required, you enable both Multilink PPP and DBA. This is therecommended setting for Multilink PPP.In order for you to use Multilink PPP, the destination you are calling must alsosupport Multilink PPP. For example, if you are trying to dial out to the Internet,your ISP must support Multilink PPP in order to successfully place a Multilink PPPcall. If you attempt to place a Multilink PPP call adding a “Second Channel asRequired” and the location you are calling does not support Multilink PPP, then asingle channel PPP connection is established. If you attempt to place a “Use TwoChannels” call and the location you are calling does not support this functionality,a connection may not be established at all.The Virtual FAXModem (Windows 95,98, NT, and 2000)The Dual 56K LAN Modem can be used with the Virtual FAX Modem application(included on the OfficeConnect Dual 56K LAN Modem Companion ProgramsCD-ROM), which enables Windows users on the LAN to access one or both of theinternal 56K modems as if they were directly connected to the user’s workstationthrough an RS-232 serial (COM) port.By installing the Virtual FAX Modem application onto individual workstationsconnected to the LAN, users can run applications that call for a dedicated modem,such as a fax application for sending Class 2.0 faxes (Class 1 or Class 2 faxes arenot supported) or connecting to Online services. Use of the two modems forVirtual FAX calls can be monitored by a network administrator through the Dual56K LAN Modem’s Manual Call Control page.Although both modems can be used at the same time to create two Virtual FAXModem connections, each connection can support only one user at a time. Inother words, a Virtual FAX Modem connection cannot be shared.For instructions on installing and using the Virtual FAX Modem, and forinformation on monitoring Virtual FAX Modem calls through the Manual CallControl page, refer to Appendix B, “Installing and Using the Virtual FAX Modem.”