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Bluetooth Specifications

Below, you'll find several specifications for thewell known Bluetooth:

1. Throughout the United States and even Europe,the range of frequency is 2,400 - 2,483.5 MHZ, with79 1-MHz RF (radio frequency) channels. The frequency range in Japan is 2,472 to 2,497 MHz with23 1-MHz RF channels.

2. A data channel of Bluetooth randomly hops 1,600times per second between the 79 RF channels.

3. Each Bluetooth channel is divided into timeslots, with each one being 625 microseconds long.

4. A Bluetooth piconet has one master and up toseven slaves. The master will transmit in eventime slots, while the slaves will transmit in oddtime slots.

5. The data in a single packet can be up to 2,745bits in length.

6. Currently, there are two types of data transferbetween devices - SCO (synchronous connectionoriented) and ACL (asynchronous connectionless).

7. In a Bluetooth piconet, there can be up to three SCO links containing 64,000 bits per secondwith each one. To help avoid collision and timingproblems, the links of the SCO will use reservedslots set up by the master.

8. A master can support up to three SCO linkswith either one, two, or even three slaves.

9. The slots not reserved for the SCO links canbe used for ACL links.

10. A single master and slave can have one ACLlink.

11. ACL is either master to one slave (point topoint) or it broadcasts to all of the slaves.

12. The ACL slaves will only transmit when it hasbeen requested by the master. If the master doesn'tmake the request, the ACL slaves won't transmit anything at all.

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