Built-In Network Feature; Consumer Infrared (Cir) (Only For Certain Models) - Acer TravelMate Series Generic User Manual

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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.