Apple PowerBook (3400 series) - Manual (Page 179)

179 Making Modem and Ethernet Connections
Using Ethernet and a modem at the same time
By using the adapter supplied with your computer if you have a combination
Ethernet/modem card, you can connect both an Ethernet cable and a
telephone line to the card. (In addition, you do not have to use the single-line
(two-wire) phone cord when you use the adapter.)
To use both Ethernet and the modem, follow these steps:
1 Open the cover on the computer’s back panel and verify that your computer has a card
with a modular connector.
You can check the label on the inside of the cover to determine if you have
the combination card.
2 Locate the adapter that came with your computer and connect the single end of it to the
card in your computer.
Y-adapter
W Telephone connector
G
Ethernet connector
Ethernet/modem card label
G W
/