Key Learning Points Of Bluetooth
By Debra Goh
Bluetooth is easily the best in wireless handheld technology. When it comes to learning, Bluetooth can get quite complicated. To help you, youll find the key learning points of Bluetooth below:
1. Bluetooth is an energy efficient, low overhead communication protocol thats ideal for interdevice communications.
2. Unlike infrared, Bluetooth doesnt 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 arent 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.
About The Author
Debra Goh is an internet entrepreneur and a freelance writer. You can visit her at http://free--cell-phone.blogspot.com
Some Bluetooth Info
The world's smallest Bluetooth headset just three weeks ago was Nextlink's Invisio G5. Today's it's a fatty, out-ano'd by the more dwarven AD-HSM10, which looks like a titanium hearing aid. It weighs about a gram less than the G5 and is more squat, but its measly 3 hours of talk time and 100 hours of standby fall short by an hour and 50 hours, respectively.
To learn more go to Bluetooth headsets.
The 'BlueGenie(TM) Voice Interface(1)' uses advanced Voice Recognition and Voice Synthesis technology to allow users to easily control the functions of their headset using their voice rather than multiple button presses.
Get more info at Bluetooth.
While most of the US is just getting their first glimpse of the Neonode N2, we've got the Neonode N2.5 for you dear readers. We were assured that this engineering prototype features a heftier battery to offset complaints raised by N2 owners. The other complaint -- lack of 3G data -- is also solved. It will also feature A2DP-enabled Bluetooth 2.1 (yes, 2.1) when its ships (no time specified) and a big fat 3G radio of unspecified type. Thing is, this time, the N2.5 is specifically targeted at the US market with Neonde already starting to sort through the carrier quagmire in order to bring it to market. WiFi? Maybe, that all depends upon the carrier's demands. Other than those changes, it features the same UI and touch screen technology of the tiny N2 which is fine by us. The only question now is how consumers react to it's new chubby profile.
Get more info at Bluetooth headsets.
All About Bluetooth
Nortel Bets Its Money on WiMAX Short Term; Hopes that LTE Can Be Developed by Next Year
Thu, 12 Jun 2008 00:00:00 EST
This enables Nortel to achieve faster time-to-market with WiMAX , at a lower cost, while accelerating LTE development to meet a demand that is emerging faster than the industry originally predicted.
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