Acer TravelMate 4000 - Manual (Page 48)

2 Customizing my computer 40
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Network
Your computer has built-in Ethernet/Fast Ethernet capabilities. To use
the network feature, connect an Ethernet cable from the network jack
to an network jack or hub. Consult your network administrator for
details.
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
(personal digital assistants), mobile phones, and infrared printers. The
infrared port can transfer data at speeds of up to four megabits per
second (Mbps) at a distance of up to one meter.
Note: The Fast Infrared feature is available on certain models only.