Dell TrueMobile 2350 User Manual page 70

Wide Area Network (WAN)
A WAN is a communications network that uses devices such as telephone lines, satellite dishes, or radio waves to span a
larger geographic area than can be covered by a LAN.
Wireless Local Area Network (WLAN)
A WLAN is a type of Local Area Network (LAN) that uses high frequency radio waves rather than wires to communicate and
transmit data among the network clients and devices. It is a flexible data communication system implemented as an extension
to, or as an alternative for, a wired LAN. Just like a LAN, the network lets users at that location share files, printers and other
services.
xDSL Modem
DSL is a type of service that allows people to access the Internet via their telephone lines. This service is typically available via
a telephone company or service provider.
An xDSL connection is a high-speed digital connection to the Internet using standard copper twisted pair telephone wires.
There are several kinds of DSL; the x refers to all of them.