Built-In Network Feature; Fast Infrared (Fir) - Acer Aspire 5100 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.

Fast Infrared (FIR)

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 meter.