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Number of Masters in a Scatternet
Original Post: (eGroups) Date:
- Is it true that only 79 masters can be active in a scatternet, due
to only 79 RF channels (USA/EUROPE) being available?
This is not strictly true. Each piconet in the scatternet will have a
unique hopping sequence based on the Masters BD_ADDR and clock, over all
the channels. Therefore obviously, it is impossible that two Masters will
have the same hopping frequency sequence. It IS possible that one or more
piconets will be using the same channel at the same time. If that happens,
there is a collision, which is handled by retransmission. Therefore the
more piconets in a small location, the greater chance of collisions. If
the scatternet is widely spaced apart, most piconets will not have the
possibility of interfering with each other. Also the access code preceding
each packet will allow the devices to know what packet is from which
piconet.
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