3Com Dual 56K manual Through an RS-232 serial COM port, 56K LAN Modem’s Manual Call Control

28CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

When this option is configured, both modem channels are used every time a connection is made to a remote destination, regardless of the amount of traffic being generated. The DBA feature is not utilized, because both channels are used for every call. Make sure that your remote destination supports this functionality.

■Add Second Channel As Required (recommended)

When this option is configured (referred to as bandwidth on demand), initially one modem channel is used to connect to a remote destination, and the second channel is automatically added when the amount of traffic on the first channel reaches a threshold that you define. When you choose Add Second Channel as Required, you enable both Multilink PPP and DBA. This is the recommended setting for Multilink PPP.

In order for you to use Multilink PPP, the destination you are calling must also support 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 PPP call. If you attempt to place a Multilink PPP call adding a “Second Channel as Required” and the location you are calling does not support Multilink PPP, then a single channel PPP connection is established. If you attempt to place a “Use Two Channels” call and the location you are calling does not support this functionality, a connection may not be established at all.

The Virtual FAX The Dual 56K LAN Modem can be used with the Virtual FAX Modem application

Modem (Windows 95, (included on the OfficeConnect Dual 56K LAN Modem Companion Programs

98, NT, and 2000)	CD-ROM),which enables Windows users on the LAN to access one or both of the
	internal 56K modems as if they were directly connected to the user’s workstation
	through an RS-232 serial (COM) port.
	By installing the Virtual FAX Modem application onto individual workstations
	connected 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 are
	not supported) or connecting to Online services. Use of the two modems for
	Virtual FAX calls can be monitored by a network administrator through the Dual
	56K LAN Modem’s Manual Call Control page.
	Although both modems can be used at the same time to create two Virtual FAX
	Modem connections, each connection can support only one user at a time. In
	other words, a Virtual FAX Modem connection cannot be shared.
	For instructions on installing and using the Virtual FAX Modem, and for
	information on monitoring Virtual FAX Modem calls through the Manual Call
	Control page, refer to Appendix B, “Installing and Using the Virtual FAX Modem.”