Apple Macintosh PowerBook Internal Modem/Ethernet - Manual (Page 13)

2 Locate the adapter that came with your computer and connect the single end of it to
the card.
3 Attach the telephone cord and Ethernet cable to the appropriate connectors in
the adapter.
The adapter has Ethernet and modem icons that indicate which connector to
use for the cable and cord.
4 Start up the computer (if it is not already on) and set up your software to use the modem
and Ethernet connections.
Y-adapter
W Telephone connector
G Ethernet connector
13