Bluetooth as a Solution
The technology of Bluetooth will take small area networking to the next level by removing the need for user intervention and help keep transmission power very low to preserve battery power. Each transmission signal to and from your cellular phone will use just 1 mw of power, giving you plenty of space on your battery to talk.
Bluetooth is a networking standard that will work on two levels:
1. It will provide agreement at the physical level, as Bluetooth is a radio frequency
standard.
2. It will provide agreement at the level of protocol, where products will have to agree
on when bits are sent, how many are sent, and how the parties in conversation can be sure the message recieved is the same one that was sent.
The major draws to Bluetooth is the fact that it’s wireless, inexpensive, and automatic. There are other ways to get around wires, including infrared. Infrared uses light waves of a lower frequency than the human eye can, and is normally used in television remote controls.
The technology of Bluetooth is intended to get around the problems that normally come with infrared systems. The 1.0 older standard of Bluetooth has a max transfer speed of 1 MB a second, while the 2.0 Bluetooth standard can manage up to 3.0 MB a second. To make things better, 2.0 is compatible with 1.0 devices.
As a solution to wireless, Bluetooth will eliminate the need for messy cords, keeping
everything nice and neat. It’s perfect for those who like to talk on cell phones, as you no
longer need to hold the phone next to your ear - which is great for those who travel a
lot.
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How to use Bluetooth?
The amazing technology of Bluetooth presents a great way of exchanging data between two wireless devices. Unlike telephones, there are no wires or messy leads to worry about. You can enjoy wireless communications with short distances of up to thirty
feet.
Bluetooth also offers interoperability, meaning that you can use your portable Bluetooth device to connect with existing Bluetooth points. This way, you won’t have to carry a data lead or CDs of drivers around with you everywhere you go. You can enjoy the best
of wireless without having to worry about installing your software.
With today’s Bluetooth, you can use your PDA and cell phone to surf the net or check emails as you travel. If you are in the business field, this can be very beneficial, especially if you like to check your email throughout the day. Bluetooth will enable you to check your email no matter where you are - which is great news for those who like to travel.
Bluetooth will also enable to you to transfer files as well, such as MP3 and photo to and from your mobile device. Bluetooth dominates the world of short range wireless, enabling you to do more than you may have thought possible.
One of the best things to Bluetooth and something everyone loves is the wireless headset. Bluetooth offers wire free headsets for your cell phone or computer, which is great for those who like to walk around or talk on the phone in the car, without having to worry about your hands getting in the way.
To make things even better, you can use a Bluetooth PS device for satellite navigation on your PDA, aptop, or mobile. If you travel - this can be really great to have.
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Bluetooth Learning Points and concepts
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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