3Com Dual 56K manual Wan Side The Two, 56K Modems, Using the Modem, Channels

22CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

Wan Side: The Two	On the Wide Area Network (WAN) side of the Dual 56K LAN Modem, up to 25
56K Modems	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:
	■ Two separate connections to different locations (one per analog line, or
	“channel”)
	■ 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.
Using the Modem	When you use the Dual 56K LAN Modem for its most common WAN application,
Channels	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		Greg
MODEM 1MODEM 2	LAN Status	Peter
	OfficeConnect Dual 56k LAN Modem

OfficeConnect¤

Dual 56K LAN Modem

Two analog lines

Peter’s PC

Internet

Greg

Public telephone

network

Pet

er

	Remote Private
Jan’s PC	Network

Figure 8 Two Simultaneous Dial-out Connections to Two Different Remote Locations