HomeRF is a localized wireless technology optimized for the home environment. Its primary use is to provide data networking and dial tones between devices such as PC's, cordless phones, Web Tablets, and a broadband cable or DSL modem. It uses Shared Wireless Access Protocol (SWAP) as the underlying protocol to carry both voice and data traffic and to interoperate with the Public Switched Telephone Network (PSTN) and the Internet; it operates in the 2400MHz band and uses a digital frequency hopping spread spectrum radio. The SWAP technology was derived from extensions of existing cordless telephone (Digital Enhanced Cordless Telephone or DECT) and wireless LAN technology to enable a new class of home cordless services. It supports both a TDMA (Time Division Multiple Access) service to provide delivery of interactive voice and other time-critical services, and a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) service for delivery of high-speed packet data.