Can't connect to 3Com Office connect wireless from Apple Mac Pro

I can't connect to 3com network from my laptop.why?

PPPoE connection is set up

1. Control Panel, double-click Network Connections. 2. Click the PPPoE connection under the Broadband group that you want to share, and then click Change settings of this connection under Network Tasks. 3. On the Advanced tab, click to select the Allow other network users to connect through this computer's Internet connection check box. 4. PPPoE connections behave in a similar way as do dial-up networking (DUN) connections, and you may want the connection to be automatically dialed when another computer on your network attempts to connect to the Internet. To do this, click to select the Establish a dial-up connection whenever a computer on my network attempts to access the Internet check box. 5. If you want to allow other network users to enable or disable the shared Internet connection, click to select the Allow other network users to control or disable the shared Internet connection check box. 6. Under Internet Connection Sharing, in Home networking connection, click the LAN (Local Area Network) connection that connects the computer that is sharing its PPPoE Internet connection to the other computers on your network.