acl-channels-are-normally-used-for L2CAP layer
ACL channels are normally used for
ACL channels are normally used for L2CAP layer

Key Learning Points Of Bluetooth

Bluetooth is easily the best in wireless handheld

technology. When it comes to learning, Bluetooth

can get quite complicated. To help you, you'll find

the key learning points of Bluetooth below:

1. Bluetooth is an energy efficient, low

overhead communication protocol that's ideal for

interdevice communications.

2. Unlike infrared, Bluetooth doesn't require

a line of sight.

3. Depending on the implementation, Bluetooth

can have a range of up to 100 meters.

4. The specification of Bluetooth consists of

a Foundation Profile Document and a Foundation Core

Document.

5. The protocol stack for Bluetooth consists

of core protocols, cable protocols, and even adapted

protocols.

6. The transmitter operates around the 2.4

GHz frequency band.

7. The data channel will change frequency, or

hops, 1,600 times in a second, between the 79 allocated

channels in the ISM band.

8. Bluetooth utilizes a spread spectrum

frequency hopping RF characteristic to ensure that

independant networking operates when the other

devices are in range.

9. A piconet is formed when one or more

devices open up a channel of communication.

10. A piconet can have a master and up to

seven slaves.

11. Communication of the interdevice is

based on the concepts of channels.

12. All Bluetooth devices are capable of

transmitting voice.

13. The channel has a total capacity of

1 MB per second.

14. There are two types of channels with

Bluetooth - SCO (Synchronous Connection Oriented) and

ACL (Asynchronous Connectionless).

15. The SCO channels are time oriented, and

are therefore primarily used for transferring time

critical data such as voice.

16. ACL channels are normally used for

communicating data.

17. Data contained in a packet can be up to

2,745 bits in length.

18. In a single piconet, there can be up

to three SCO links containing 64,000 bits a second

each.

19. To avoid collision and timing problems,

SCO links are reserved slots that are set up by

the master.

20. The masters can support up to three

SCO links with either one, two, or three slaves.

21. The slots that aren't reserved for SCO

links can be used as ACL links.

22. The LMP (Link Management Protocol)

will handle link level security, error corrections,

and the establishment of communications links.

23. The LMP packets will have priority

over user packets that originate and form the

L2CAP layer.

24. The L2CAP layer will ensure an

acceptable quality of service.

25. No more than one ACL link can exist

at the L2CAP layer.

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