3Com WL-603 - Manual (Page 79)

Internet Settings 77
Disable
Selecting this option means that you do not want your Router to connect
to the Internet.
Figure 60 Disable Internet Connection Screen
PPPoE
PPP over Ethernet, provides routing for multiple PCs, this mode is often
used for the DSL connection. To configure this function correctly, you
should obtain the information from your ISP.
Figure 61 PPPoE Settings Screen