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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 independent 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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Astrobiologists at NASA and elsewhere are now seriously considering the possibility that life on Earth originated outside the planet and was brought into it by space debris impacting its surface over vast stretches of time. Do these space debris only contain ordinary matter? The scope of evolution will be considerably broadened if they also contain dark matter. Were the first cells a composite of dark and ordinary matter? Did dark matter bodies co-evolve with ordinary matter bodies?
Biologists are beginning to realize that co-operation was just as important as competition in the evolution of life's diversity and resilience. Every cell in the human body contains a mitochondrion which is thought to be a bacterial cell which invaded an early eukaryote. Instead of being digested, both cells tolerated each other and began to live with each other - a merger which provided synergies to both.
It seems saving the planet is a big deal, a world-wide goal, but, if we are truly going to save the planet we need to consider a few things first. For instance can 10 Billion people live on the surface of the planet and if so, will the planet sustain them all? How about 15 or 20 Billion? Well, at our current consumption levels most likely not. What if we reduce or consumption; can it be possible then?
Today, although it is somewhat uncommon many are living over 100-years of age. Each year more and more people make it to their centurion years. Have you ever wondered what the high-end of human life span might be in the future? Well, sorry for the delay in the reply to this question of your, I do believe it does deserve a legitimate answer. So, will it be possible for humans to live to be 250, 500 or even 1,000 years old?
What if Humans could live 1,000 years, then we would still have the top scientists of the last 1000 years, but would this help our scientific advancement or hurt our technological achievement? What about Einstein, what if he were still alive today? Would his name, cause folks to follow him to this day, rather than challenge his theories?