Apple PowerBook G3 - Manual (Page 141)

Your Macintosh PowerBook computer came with a card installed in the PCI
expansion slot. The card provides an Ethernet connection or modem and
Ethernet connections.
You can easily determine which type of card your computer has. Open the
cover on the computer’s back panel. On the computer you’ll see a modular
telephone-style connection (a socket) and on the cover is a label that shows
the Ethernet icon (G) or a combined Ethernet and modem icon (G
/W).
The cable or cables you need to use with the card are also supplied with
the computer.
Label showing icon for card
Connector for
Ethernet/modem
or Ethernet card
141
Appendix D Making Modem and Ethernet
Connections to an Internal Expansion Card
Refer to this appendix for
information on connecting Ethernet
and telephone cables to an
expansion card in your computer.