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12 Bluetooth Specifications by Lawrence Cheney
Below, you'll find several specifications for the well
known Bluetooth:
1. Throughout the United States and even Europe, the range of frequency
is 2,400 - 2,483.5 MHZ, with 79 1-MHz RF (radio frequency) channels. The
frequency range in Japan is 2,472 to 2,497 MHz with 23 1-MHz RF
channels.
2. A data channel of Bluetooth randomly hops 1,600 times per second
between the 79 RF channels.
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3. Each Bluetooth channel is divided into time slots, with each one
being 625 microseconds long.
4. A Bluetooth piconet has one master and up to seven slaves. The master
will transmit in even time slots, while the slaves will transmit in odd
time slots.
5. The data in a single packet can be up to 2,745 bits in length.
6. Currently, there are two types of data transfer between devices - SCO
(synchronous connection oriented) and ACL (asynchronous connectionless).
7. In a Bluetooth piconet, there can be up to three SCO links containing
64,000 bits per second with each one. To help avoid collision and timing
problems, the links of the SCO will use reserved slots set up by the
master.
8. A master can support up to three SCO links with either one, two, or
even three slaves.
9. The slots not reserved for the SCO links can be used for ACL links.
10. A single master and slave can have one ACL link.
11. ACL is either master to one slave (point to point) or it broadcasts
to all of the slaves.
12. The ACL slaves will only transmit when it has been requested by the
master. If the master doesn't make the request, the ACL slaves won't
transmit anything at all.
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