HP Deskjet 6127 Color Inkjet Printer - Manual (Page 169)

cables
Use an unshielded CAT-5 ethernet cable to connect the printer to an ethernet network.
Ethernet cables have an RJ-45 plug.
rj-45 plug
To prevent damaging the printer, do not use a phone
cord to connect the printer to an ethernet network, and
do not connect the printer to a phone jack.
network communication
TCP/IP
Devices on a network communicate with one another using a "language" called a
protocol . The printer is designed to operate on networks that use a popular protocol
called TCP/IP .
The printer's built-in ethernet feature does not support AppleTalk. Only
Macintosh computers running Mac OS 9.04+ or Mac OS X v10.1+ and that
support TCP/IP can communicate with the printer via the built-in ethernet
feature.
IP address
Each device on a network identifies itself with a unique IP address . Most networks use
DHCP or AutoIP to automatically assign IP addresses.
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