An In Depth Look At Bluetooth Specifications
On this page, you will see several of the specifications listed for Bluetooth technology:
1. Not only in the U.S., but also in Europe, the frequency range is from 2,400 to 2,483.5 MHz, with 79 individual 1 MHz RF (radio frequency) channels. In Japan, the frequency range is only from 2,472 to 2,497 MHz with only 23 1 MHz RF channels.
2. A Bluetooth data channel (via frequency hopping) hops randomly 1,600 times between its 79 RF channels within 1 second.
3. Each of the Bluetooth channels are divided into time slots. Each of these time slots are only 625 microseconds long.
4. Bluetooth piconets include a master and can have up to 7 slaves. The masters transmit in even time slots, and the slaves transmit in odd time slots.
5. The data in one single packet of information may be up to 2,745 bits long.
6. Currently there are only two kinds of data transfer between Bluetooth devices. These include SCO or synchronous connection oriented and ACL or asynchronous connectionless.
7. In one single Bluetooth piconet, there may be up to a total of 3 SCO links each containing 64,000 bits/second within each one. To assist in avoiding collisions and problems with timing, the SCO links will then use slots that are reserved (set up by the master).
8. A master may be able to support up to a total of 3 SCO links with 1, 2 or even 3 slaves.
9. Any and all slots that are not reserved for the SCO links may be used for the ACL links.
10. Any single master and slave may have a total of 1 ACL link.
11. An ACL link is either constructed of 1 master to 1 slave (point to point) or it may broadcast to all of the other slaves as well.
12. An ACL slave will transmit, only when request has been made by the master. If the master does not make such a request, the ACL slaves will not transmit any data at all.