If you have an Ethernet card instead of built-in Ethernet, the port or ports will be the same, but may not be identified by an Ethernet icon. It is also possible you may have a different kind of port, such as 10Base-2 Thin Coax, which will look something like a cable TV jack. Once you have located the Ethernet jack on your computer, you need to determine how you are connecting to the network. The usual manner is through a wall data jack or a hub. A wall data jack looks like a phone jack, but the jack is slightly larger.
Hubs come in various shapes and sizes.
The exact method of connecting your Mac OS computer to a hub depends on the kind of hub you are using. You may have to use a transceiver to connect to it, depending on what kinds of ports your computer and the hub have. You can order a transceiver from any of the major Macintosh catalogs. This is document adaz in domain all from the Knowledge Base. No, and I'd like to ask a consultant.