adequate RF coverage. Appreciation of the evolving technologies applied to secure WLANs enables appropriate choices to be made in deciding on the security requirements and on-going management implications for a particular WLAN implementation. A WLAN planned and implemented on the basis of a sound understanding of these underlying concepts and technologies will have the best possible chance of effectively meeting user performance expectations and security requirements. WIRELESS PAN IMPLEMENTATION Introduction A personal area network (PAN) is an interconnection of devices for personal use within the operating space of an individual - usually in the range of 1-10 metres. Wireless PANs aim to achieve this interconnectivity and give greater flexibility, mobility and freedom from the hassle of finding the right cable! WPANs differ from WLANs in that they are not intended to replace Ethernet type local networks, giving neither the range nor, at least at present, the data capacity or variety of services of WLANs. Instead they focus on the specific information and connectivity needs of the individual - synchronising data from a desktop computer to a portable device, exchanging data between portable devices and providing Internet connectivity for portable devices. Implementing successful WPANs is also less technically demanding than a typical wireless LAN implementation. Connections are generally quick to set up and call for little or no specific configuration. Chapter 10 looks at the technical and practical characteristics of a range of different PAN technologies, starting with the current de facto standard Bluetooth and including several emerging generic and niche competitors Part Four such as Wireless USB and ZigBee. The infrared IrDA standard, which has been very widely implemented as a flexible serial port replacement, is also covered. Implementation aspects including technology choices, security and other practical issues are covered in Chapter 11. CHAPTER Wireless PAN Standards Introduction Wires to connect the incr