Acer Aspire 4739Z - Manual (Page 57)

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Built-in network feature
The built-in network feature allows you to connect your computer to an
Ethernet-based network.
To use the network feature, connect an Ethernet cable from the Ethernet
(RJ-45) port on the chassis of the computer to a network jack or hub on
your network.
Consumer Infrared (CIR) (only for certain models)
The computer’s Consumer Infrared (CIR) port is used to receive signals from your
remote control, or other devices with CIR capability.