Wireless LANs can be used for LAN extension between buildings, nomadic access for mobile users, and temporary ad hoc networks. There are several wireless LAN categories including infrared, spread spectrum, and narrowband microwave networks. Infrared networks have an unlimited radio spectrum but are limited by concerns of eye safety and range. Spread spectrum networks use multiple-cell configurations with either peer-to-peer or hub-based topologies. Narrowband microwave networks can be licensed to avoid interference or use unlicensed spectrum at low power over short ranges.

1. Wireless LAN Technology Unit -1

4. Multiple-cell Wireless LAN