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WiFi HomeRF also adds functionality by blending several industry standards, including IEEE 80211 FHSS for data and DECT for voice The standards for HomeRF are addressed by a consortium of vendors called the HomeRF WG Under the HomeRF standard, compliant devices carry both voice and data traffic and interoperate with the Public Switched Telephone Network (PSTN) and the Internet The standard specifies the use of Time Division Multiple Access (TDMA) to provide the delivery of interactive voice and other time-critical services, as well as carrier sense multiple access/collision avoidance (CSMA/CA) for the delivery of high-speed packet data Table 1-3 summarizes the main characteristics of HomeRF
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The HomeRF standard provides the basis for a broad range of home networking applications, including the following:
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Shared access to the Internet from anywhere in the home, enabling a user to browse the Web from a notebook on the deck or have stock quotes delivered to a PC in the den
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Table 1-3 HomeRF characteristics
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Feature/Function Frequency-hopping network Frequency range Transmission power Data rate 50 hops per second 24 GHz ISM band 100 mW
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16 Mbps with HomeRF 10 10 Mbps with HomeRF 20 25 Mbps with HomeRF 30 (future) Covers up to 150 feet for typical home and yard Up to 127 Up to 4 active handsets Blowfish encryption algorithm (over 1 trillion codes) LZRW3-A algorithm Enables concurrent operation of multiple co-located networks
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Range Total network devices Voice connections Data security Data compression 48-bit network ID
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WiFi in Perspective
Automatic intelligent routing of incoming telephone calls to one or more cordless handsets, fax machines, or voice mailboxes of individual family members Cordless handset access to an integrated message system to review stored voice mail, faxes, and e-mail WLANs, enabling users to share files and peripherals between one or more PCs, no matter where they are located within the home Spontaneous control of security, electrical, heating, and air conditioning systems from anywhere in or around the home Multiuser computer games playable in the same room or in multiple rooms throughout the home
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Network Topology
The HomeRF system can operate either as an ad hoc network or as a managed network under the control of a connection point In an ad hoc network, where only data communication is supported, all stations are equal and control of the network is distributed between the stations For time-critical communications such as interactive voice, a connection point is required to coordinate the system The connection point, which provides the gateway to the PSTN, can be connected to a PC via a standard interface that will enable enhanced voice and data services such as the universal serial bus (USB) The HomeRF system also can use the connection point to support power management for prolonged battery life by scheduling device wakeup and polling The network can accommodate a maximum of 127 nodes The nodes consist of four basic types:
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A connection point that supports voice and data services A voice terminal that only uses the TDMA service to communicate with a base station A data node that uses the CSMA/CA service to communicate with a base station and other data nodes An integrated node that can use both TDMA and CSMA/CA services
HomeRF uses intelligent hopping algorithms that detect wideband, static interference from microwave ovens, cordless phones, baby monitors, and WiFi networks Once detected, the HomeRF hop algorithm adapts so no two consecutive hops occur within this interference range This means that, with very high probability, a packet lost due to interference will get through
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when it retries on the next hop Although these algorithms benefit data applications, they are especially important for voice, which requires extremely low bit error rates (BER) and low latency WiFi does not use the frequency-hopping mechanism; instead, it uses DSSS In doing so, however, WiFi does not support real-time applications such as voice, and it is not very resistant to interference from other household devices Standards currently under development for WiFi are addressing these issues
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