Built-In Network Feature; Fast Infrared - Acer TravelMate 4100 Series 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
network jack on the rear of the computer to a network jack or hub on
your network.

Fast Infrared

The computer's Fast Infrared (FIR) port allows you to do wireless data
transfer with other IR-aware computers and peripherals such as PDAs,
mobile phones, and infrared printers. The infrared port can transfer
data at speeds of up to 4 Mbps at a distance of up to one metre.