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.
411
Video iPod’s package
The trend that the Apple company set for their packages is redefined with every new appearance of a product. Actually, the permanent search in finding the right package and aesthetics and adapting the box to both the product and the customers’ needs is focused on discovering a more compact way of packaging and, at the same time, with an expressive, yet subtle artistic touch. Due to the characteristics of the product, the packaging of the video iPod tries to be both practical and aesthetic, in order to symbolize somehow the visual characteristics and quality of the new product.
The original package of the iPod was a 6″ cube box. The box was supposed to be removed out of the sleeve, after which, it was unfolded as a flower. The first iPod package reflected the image that the company was trying to promote: exuberant style, expressive elements, brisk and intense colors and sounds. After the appearance of the next types of iPods, this image of the product changed into a more mature one, an image which was expressed through the campaigns, the package and the general design of the product.
The main color of the iPod video is plain black, which is rather risky, yet original, considering the fact that the main aspect that the device has is the video, meaning colors, motion and diversion. Still, there are various silver accents on the box, which represent the Apple logo and text. Still, the color of the box fits with the colors of the actual iPods: black and white, just like the iPod nano. By choosing these colors and this style of packaging, Apple wanted to create a more sophisticated and stylish look of the new product; together with this, the ads for the product changed to a more series and mature tone.
The shape of the box differs, as well, from the first flower-like box of the first generation of iPods: this iPod’s video box is rather flat and square, more stylish and more serious looking. Actually, this box works as a sleeve, as well, with one open end, similar to a DVD box set, but it also contains another inner box, which is very well fixed inside. The inner box opens in 2 distinctive parts: one part contains the iPod device and the other contains a monolith.
The package lacks a manual guide still, it has a small Quick Start Guide; instead, it has a CD which contains all the needed usage instructions of the iPod video. Besides these, the box contains a relevant and think copyright statement and a protective sleeve for the actual iPod. The CD which contains the instructions displays an appropriate PDF file that suits any computer, using the languages English, French, German, Japanese and Chinese. Another inside package contains an USB adapter cable and the ear buds; this type of iPod has even smaller ear buds, which need to be protected while opening the box.
The new product iPod video has, besides various improvements in the technical department among which, the video feature is the most relevant one, another package, another image and way of presentation. The new package manages to remain practical, yet it becomes safer. Besides these, the new package offers a more sophisticated and elitist image of the product, concentrating on refined touches and neutral colors.
558
Bluetooth Applications
With Bluetooth being very popular with wireless, it’s
no wonder there are many applications available for
the technology. Below, you’ll find the applications
for Bluetooth.
1. Wireless networking between laptops and desktop
computers, or desktops that are in a confined space
and little bandwidth is needed.
2. Peripherals such as mice, keyboards, and printers.
3. Cell phones with Bluetooth technology have been
sold in large numbers, as they are able to connect to
computers, PDAs (Personal Data Assistant, and various
other devices. The standard also includes the
support for more powerful and longer range devices.
4. The transfer of files, images and MP3, between
mobile phones.
5. Certain MP3 players and digital cameras to
transfer files to and from computers.
6. Bluetooth technology headsets for smart phones
and cell phones.
7. Data logging equipment that transmits data to
a computer via Bluetooth technology.
8. Sony Playstation 3 and Nintendo Revolution will
both use Bluetooth technology for their wireless
controllers.
For Bluetooth, there are literally hundreds of
different applications and devices available for you
to use or purchase. As you may already know,
Bluetooth is the most popular wireless technology
in the world. It’s very reliable, very dependable,
and very hard to crack into.
There are many other applications for Bluetooth in
development now, many of which plan to take the
wireless age to the next level. Video game systems
are using Bluetooth technology as well, for their
wireless controllers. This is great news for gaming
fans, as Bluetooth offers the best in wireless
data transmission.
If your curious about applications for Bluetooth
that are still in development, you can search on
the internet. You can find all sorts of information,
especially when it comes to Bluetooth. As the
future arrives, you can expect Bluetooth to bring
bigger and better things.
300
Comparison between the play station portable and the iPod video
The new iPod video was one of the most surprising products of 2006, due to the fact that iPods didn’t include the video feature, since the launching of the 5th generation of iPods in 2005.
Still, the natural comparison the customers and not only made was the one between the play station portable, also known as the PSP and the new model of the iPod series. PSP is basically a handheld game console which was produced by the company Sony Computer Entertainment, back in 2004. The public’s reactions to this new device which was rather different than almost everything on the market was very good, due to the fact that the small device allowed customers to play famous games, and, at the same time, watch clips.
Comparing the batteries of these 2 devices or, better said, the life of the batteries, it is a fact that the PSP device lasted much longer than the iPod. While playing a movie, the battery of the iPod dies after almost 2 hours and a half, while the PSP battery lasts up to more than 7 hours, which is a big plus.
Comparing the audio quality, it must be said the fact that both the devices provide a good audio quality; still, the iPod video turned out to provide a slightly clearer sound than the play station portable. This is due to the act that the audio in the iPod video file is encoded into AAC audio. On the other hand, the PSP seemed to have more bass in some cases, but overall, the difference was not that relevant and significant. The video quality of the 2 devices is another subject worthy to discuss and debate upon. It is known the fact that the PSP has a much larger screen. Even so, in this case, the large size advantage does not equal a better picture: the iPod manages to show a very sharp picture and sharp and clear text even long ones. On the other hand, when discussing the difference in the video conversation, the fact is that a video iPod takes around 12 hours to encode a video, while the play station portable only needs a bit under 3 hours to do the same thing.
Comparing the 2 devices, it is obvious that they both have advantages and some flaws. Even though the video quality seems better on the iPod video device, the PSP presents a longer life of the battery and faster ways to encode videos. Still, the iPod is a smaller device, so it is natural that some features are not that optimized as in the case of the PSP. Even more, due to the fact that it is smaller, the iPod is much easier to transport and to use in various occasions. The studies even showed the fact that both items are sold mostly in vacation periods, meaning the fact that the customers use them as an entertainment item in their both summer and winter holidays.
The 2 devices, even though they are similar in many ways of their practical usage, present both pros and cons or advantages and disadvantages. Depending on the customer’s needs and desires, they can choose the one that best fits their necessity, available time or quality expectations.
553
Bluetooth Basics
The technology of Bluetooth wireless is a short
range communications method intended to replace
the cables that connect portable or fixed devices
while maintaining the highest levels of security.
The key features offered by Bluetooth include
low power and low cost. The specification in
Bluetooth defines a uniform structure for a wide
range of devices to communicate and connect with
one another.
The technology behind Bluetooth has achieved
global satisfaction such as enabled devices, almost
everywhere in the world. Bluetooth devices will
connect and communicate without wires through
short range and networks known as piconets.
Each device will simultaneously communicate with
up to seven other devices within a single piconet,
meaning that each device can also belong to
several piconets simultaneously. The piconets
are dynamically established as Bluetooth enabled
devices enter and leave the proximity of radio.
A fundamental to Bluetooth strength is the
ability to handle both data and voice transmissions
simultaneously. This will enable users to enjoy
varieties of innovative solutions such as hands
free talking, printing and fax capabilities,
and other applications.
Specifications
Unlike other standards of wireless, the Bluetooth
specification gives product developers both a
link layer and application layer definitions,
which will help support data and voice applications.
Spectrum
The Bluetooth technology operates in the industrial
and scientific band at 2.4 to 2.485 GHz, using a
spread spectrum, frequency hopping signal.
Interference
The adaptive frequency hopping of Bluetooth
technology was designed to reduce interference
between wireless technologies that share the 2.4
GHz spectrum. Adaptive frequency hopping (AFH
works well within the spectrum to take full
advantage of the frequency available.
AFH hopping allows for more efficient transmission
within the spectrum, which provides users with
greater performance even if they are using other
technologies along with Bluetooth.
291
Bluetooth Glossary
Below, you’ll find a list of the most used terms in
Bluetooth technology. They can serve as a look up,
or to help you learn more about Bluetooth terms in
general.
2 in 1 handset
The situation where a subscriber’s handset is acting
as a remote handset to a base unit that provides a
network connection.
3G
Third generation, referring to the next generation
of digital phone technology.
802.11 WLAN
A wireless LAN specification defined by the IEEE.
Access code
Each base band packet will start with an access code,
which can be one of 3 types – CAC, DAC, and IAC.
ACK
Acknowledge.
ACL
Asynchronous Connectionless Link. This is one of the
two types of data links that are defined for Bluetooth.
ACO
Authenticated Ciphering Offset.
Active mode
During the active mode, the unit will actively
participate on the channel. The master will schedule
the transmission based on traffic demands from the
different slaves.
AP
Access point.
Authentification
The process of verifying who is at the opposite end
of the link.
Authentification device
A device whose identity has been verified during the
lifetime of the current link based on the
authentification procedure.
Baseband
This describes the specification of the digital
signal processing aspect of the hardware – the
controller – which carries out the baseband
protocols.
BB
Abreviation of baseband.
BD
Bluetooth device.
BER
Bit Error Rate.
The above is more of an intro to the terms that are
used with Bluetooth. Bluetooth currently has hundreds
of devices, making it the best wireless solution in
the world. With more coming out every day, you can
bet that Bluetooth will be around for many years to
come.
If you are new to Bluetooth, the terms used can be
very helpful. There are hundreds of glossary terms
that apply to Bluetooth, many of which describe
shortcuts to common terms. You can learn a lot by
reading over the meanings, especially if you have
never used Bluetooth technology before.
Those of you who have experience with Bluetooth,
can look over the glossary of terms to brush up
on your knowledge or just check out what an unfamiliar
term actually means. Nothing is complicated with
the meanings, although they make take some getting
used to.
Once you have been around Bluetooth for a while,
you’ll find yourself right at home with the terms
and meanings to the technology. All you need to do
is play around with it, and read books or manuals
whenever you get the chance. Before you know it,
you’ll be a professional in the vast world of
Bluetooth wireless.
430
The style of the new iPod video
Technical devices are, firstly, devices which provide a practical usage. Still, an increased concern in how these devices should look and what their particular style expresses is not insignificant, either.
The design of the new iPod video is rather unique and different from all the other models of the iPod series, which basically includes 4 generations of this device. Firstly, the design of the new iPod had to be adapted to the optimized features of the product. Secondly, the most important factor when designing this item was the fact that it had to have a large and colored screen, in order to provide the video feature at a high level. Even more, even though it is a technical device, the iPod always had a fashion of its own, which made the item, besides a provider of music photos and now, videos, a trendy accessory, which young people preferred to wear. Considering this, the design engineers of the Apple team managed to pay an increased attention to all the aesthetical features of the device and took care of all the tiny details which actually made the iPod look great at the end.
The iPods were found on the market in various colors since their appearance. From the intense and bright pink iPod of the first generation to the elegant and popular white, the iPod managed to keep the same style, even through different colors. Even more, the most famous iPod ads were always focused on bright colors, such as orange, green, intense turquoise and lots of shiny pink. The iPod video is found on the market today in two basic colors: white and black and the choice of these colors is owed to the fact that, on one hand, the previous iPod nano had the same colors and it was a big hit product since it was launched and, on the other hand, the fact that with the new iPod video, the marketers and the advertising team wanted to promote a more serious look of this device, with a subtle and more elegant style. Still, the ear buds for this device are kept in the same color, white, as they have been since the first appearance of the iPod on the market in the year 2001.
The reviews that regard the aspect and design of the new iPod video mention the fact that some black ear buds were expected, as well, in other to fit better with the elegant look of the black iPod video. Even more, regarding the colors of the new iPod video, the reviews mention the fact that, while people expected the white iPod video to require more maintenance than the black one, the reality shows the fact that the dirt is much more visible on the black device. At the same time, Apple offers in the large package which includes the iPpod a protecting sleeve for the video device. This sleeve is colored in light grey and manages to protect the iPod and keep it clean, at the same time.
The new package of the iPod video brings many new aesthetic and stylish features: the text and the Apple logo on the box are embossed with silver, which makes the black package look elegant and elitist, which is exactly what the company wanted.
554
Cell phone plans, choose the best deal.
Cell phone has evolved to be one of the most important part of life. Most businesses require their officers to have a cell phone. Even individuals need cell phones in going about their daily lives. This is why acquiring this important gadget require intelligence to avoid inappropriate expense. Finding the most reasonable cell phone plan is one requirement in choosing cell phones intelligently. Because of the very large number of network services in this country, it may help you to research and assess their offers before deciding on a cell phone plan.
Before you decide to buy a cell phone, you may want to decide first whether you want a prepaid cell phone service or a traditional cell phone plan. If you decide on a prepaid cell phone service, then no problem, no credit check, you just need to pay outright and immediately you have your phone. Some cell phone companies even offer free cellular phone unit when you acquire a prepaid cell phone service from them. However, when you want a cell phone plan, you may need to choose from a by minute charging or by the second charging. Both charging process have positive and negative points. You need to assess your usage frequency and requirements before you decide on a cell phone plan. You may research on the performance like if they have enough towers to reach you wherever you are. There are different cell phone plans for family and national use. There are also cell phone plans for regional use. All of these have their own benefits although there are also their disadvantages. For prepaid cell phone plans, there are cell phone units that may not have the capability for this connection.
Other cell phone plans like family plans, this is advantageous for family use and small businesses. There is free access for emergencies. In addition, for family plans, it is cheaper to call the other cell phones included in one billing. There are also discounts for the airtime usage of family members using this cell phone plan. For national plans, this cell phone plan includes free long-distance charges. There are no roaming charges for this cell phone plan and it is another advantage. For regional use, this cell phone plan may require you to pay long-distance charges but the airtime rates may be cheaper.
Cell phone plans may be beneficial is you can acquire the once that have the benefits you need. The manner of usage is an essential requirement, if you do not need it as much and just for emergencies, prepaid cell phone plan could suit you well than traditional plans where you need to sign a contract with the service provider.
Prepaid cell phone plans are often preferred; however, for travelers the traditional plan with no roaming charges and no long-distance charges might be best.
All of this notwithstanding, in order to make full and effective use of your cell phone, you may want to set some guidelines in your usage. If you want your cell phone for your business, you may need to make sure you turn it off when you need privacy. Being available every time may not do well for you. Reserve sometime for yourself and never allow people to disturb you during this time. If your business partners know they could reach you even late at night and on weekends, they will be annoyed if you suddenly change this behavior. Having a cell phone and being available all the time may not be healthy, thus, you have to be wary not to allow people disturb you when you need to be alone with or without your cell phone.
Cell phone plans, choose the best deal.
Cell phone has evolved to be one of the most important part of life. Most businesses require their officers to have a cell phone. Even individuals need cell phones in going about their daily lives. This is why acquiring this important gadget require intelligence to avoid inappropriate expense. Finding the most reasonable cell phone plan is one requirement in choosing cell phones intelligently. Because of the very large number of network services in this country, it may help you to research and assess their offers before deciding on a cell phone plan.
Before you decide to buy a cell phone, you may want to decide first whether you want a prepaid cell phone service or a traditional cell phone plan. If you decide on a prepaid cell phone service, then no problem, no credit check, you just need to pay outright and immediately you have your phone. Some cell phone companies even offer free cellular phone unit when you acquire a prepaid cell phone service from them. However, when you want a cell phone plan, you may need to choose from a by minute charging or by the second charging. Both charging process have positive and negative points. You need to assess your usage frequency and requirements before you decide on a cell phone plan. You may research on the performance like if they have enough towers to reach you wherever you are. There are different cell phone plans for family and national use. There are also cell phone plans for regional use. All of these have their own benefits although there are also their disadvantages. For prepaid cell phone plans, there are cell phone units that may not have the capability for this connection.
Other cell phone plans like family plans, this is advantageous for family use and small businesses. There is free access for emergencies. In addition, for family plans, it is cheaper to call the other cell phones included in one billing. There are also discounts for the airtime usage of family members using this cell phone plan. For national plans, this cell phone plan includes free long-distance charges. There are no roaming charges for this cell phone plan and it is another advantage. For regional use, this cell phone plan may require you to pay long-distance charges but the airtime rates may be cheaper.
Cell phone plans may be beneficial is you can acquire the once that have the benefits you need. The manner of usage is an essential requirement, if you do not need it as much and just for emergencies, prepaid cell phone plan could suit you well than traditional plans where you need to sign a contract with the service provider.
Prepaid cell phone plans are often preferred; however, for travelers the traditional plan with no roaming charges and no long-distance charges might be best.
All of this notwithstanding, in order to make full and effective use of your cell phone, you may want to set some guidelines in your usage. If you want your cell phone for your business, you may need to make sure you turn it off when you need privacy. Being available every time may not do well for you. Reserve sometime for yourself and never allow people to disturb you during this time. If your business partners know they could reach you even late at night and on weekends, they will be annoyed if you suddenly change this behavior. Having a cell phone and being available all the time may not be healthy, thus, you have to be wary not to allow people disturb you when you need to be alone with or without your cell phone.
Cheap cellular phone, only an alternative
The old concept that cellular phones are merely luxurious toys is now dismissed by the growing need for it. Cellular phones now became a very essential tool for everyone including parents who want to know where their kids are on a real time basis. Business executives do business more effectively with a multi-functional cellular phone. Eve teenagers need cellular phones. Gone are the days when cellular phones are toys to show off, now cellular phones evolve to be a necessity. Thus, cellular phones of various models and designs now flood the market. There are those cellular phones that can perform many different functions but there are also those basic telephones that come in cheap.
Because of this great need and want for cellular phones, manufacturers flood the market from cheap cellular phones to high-tech cellular phones. If you are one of those who are lucky and that you can afford high-tech cellular phones, then that is good for you, however, if you want or need a cellular phone but cannot afford high-tech cellular phones, then you may acquire a cheap cellular phone. Knowing what you need and how you need it may help you find a cellular phone with reasonable and useful features. If you are to buy a cheap cellular phone, you should never expect it to perform tasks a high tech cellular phone can give. Merely being able to send and receive calls may be enough for you to expect from your cheap cellular phone. Because you cannot afford the high definition performance of high tech cellular phone, having reasonable expectation may help you avoid throwing your cellular phone out of your window. Cellular phones especially cheap cellular phones may only give you basic communication capabilities. Having to send and receive call which is the basic function of a cellular phone may be the only functions if can offer. Thus, you need to check the reception of your cheap cellular phone, since this is the only thing it is good for, it has to perform well enough for this basic function. Sending and receiving text messages may be available for cheap cellular phone however, only on a limited basis. If your can find a cheap cellular phone that has text messaging capacity, it will be better for you. Sending and receiving internet communication may not be available for cheap cellular phone; you do not need it as much anyway. However, if you do need to be able to send and receive message in your cellular phone from internet sites, cheap cellular phone is not going to be any good.
Cheap cellular phones notwithstanding, if you can afford cellular phone plan that provide free cellular phones, you may choose a cellular phone plan that will provide free cellular phone with reasonable and advanced features. Not the high-tech cellular phone but definitely not very limited features like what you will find in cheap cellular phones. Various network companies offer this wonderful promotion and thus you may take advantage of owning a good quality cellular phone. If you can find a neat deal from a cellular phone plan, you may not need to content yourself with cheap cellular phones.
Even a simple as buying a cellular phone, one need to research a bit in order to get enough and reasonable benefit even form a meager budget, thus you may not need to settle for a cheap cellular phone.
