Here three ways to connect a Power Macintosh G3 computer's 10Base-T Ethernet to an existing coaxial Ethernet network:
The second solution can range in price from that of a card to a more expensive hub, and is especially good if multiple 10Base-T systems are to be connected to an existing 10Base-2 coaxial Ethernet network -- or growth is anticipated.
The third solution was once in widespread use. Media adapter transceivers have faded from popularity as Ethernet has standardized more on twisted pair media. These media adapters can join a single RJ-45 connection to coax, and can to join two entire networks or add a single node to an existing network.