Abstract
This chapter provides an overview of the different types of devices available for wireless networking at the three operating scales—personal, local, and metropolitan. One of the devices is wireless network interface cards (NICs), which turn a device such as a PDA, laptop, or desktop computer into a wireless station and enable the device to communicate with other stations in a peer-to-peer network or with an access point. The access point (AP) is the central device in a wireless local area network (WLAN) that provides the hub for wireless communication with the other stations in the network. The AP is usually connected to a wired network and provides a bridge between wired and wireless devices. ZigBee is an emerging low data rate, very low power, wireless networking technology, which is likely to find a wide range of applications, including a low-cost replacement for Bluetooth in applications that do not require higher data rates.
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