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Wireless Networking within a
building is achieved using one of two main types of wireless LAN
- Solutions using Frequency Hopping Spread
Spectrum radio's. IEEE 802.11
- Solutions using Direct Sequence Spread Spectrum radio's. IEEE
802.11b
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FHSS
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DSSS
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Data rate - through the air
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Up to 3Mbps
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Up to 11Mbps
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Net data throughput
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Up to 2.4Mbps
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Up to 5.5Mbps
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Number of co-located cells /
systems
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Maximum 26 in any one hopping
set. There are 3 sets of 26
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Maximum 3. Channels 1,7 & 13
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Ideal for indoor applications
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Yes
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Yes
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Ideal for outdoor applications
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Yes
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No
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FHSS is lower data rate than DSSS
systems but can be installed into virtually any location without fear of
interference interrupting it's operation.
DSSS delivers higher bandwidth
than FHSS systems but cannot always be installed - due to all three available
channels being used in the area. If you are sharing a building where other
people are also using DSSS, you may encounter problems.
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networking 
