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Bluetooth Operation
The networking standards of Bluetooth will transmit
data via low power radio frequency. Bluetooth
communicates on a 2.45 GHz frequency. This very
band of frequency has been set aside by international
agreement for the use of industrial and medical
devices.
Many bluetooth phones devices that you already known and use take
advantage of this frequency band. Garage door
openers, baby monitors, and the next generation of
mobile phones all use this frequency within the ISM
band. Ensuring that Bluetooth and the other
devices don't interfere with each other is a crucial
part of the design process.
One of the ways Bluetooth will avoid interfering
with other electronic devices is by sending out
weak signals of around 1 mw. In comparison, even
the most powerful of cell phones can transmit a
signal of 3 watts.
The low power signals will limit the range of a
Bluetooth device to around 32 feet, which cut the
chances of interference between your computer and
other electronic devices. Even though it has low
power, Bluetooth doesn't require a line of sight
between bluetooth wireless the communicating devices. The walls in
your home won't stop bluetooth printer the signal, making it great
for rooms throughout the house.
Bluetooth can connect 8 devices at the same time.
With each of those devices on the same radius bluetooth printer,
you may think they would interfere with each
other, although it's very unlikely. Bluetooth
utilizes a technique known as low frequency
hopping, which makes it harder for more than
one device to transmit on the same frequency
at the same time.
With this technique, a device will use 79
individual, randomly chosen frequencies within
a designated range, which change from one another
on a regular basis.
In the case of Bluetooth bluetooth phones, the transmitters will
change frequency 1,600 times or more every
second, meaning that more devices can make full
use of the radio spectrum. Since every
transmitter of Bluetooth will use spread spectrum
automatically bluetooth phones bluetooth phones, it's very unlikely that two
transmitters will be on the same frequency at the
exact same time.
When the Bluetooth devices come within close range
of each other, an electronic conversation will
occur to determine whether or not they have
data to share or whether one needs to take total
control. The user doesn't have any buttons to
press or commands to give - as the conversation
will occur automatically.
Once the conversation has occured, the devices
will form a network. Bluetooth bluetooth devices will
create a bluetooth PAN (Personal Area Network) or piconet
that may fill a room. Once the piconet has been
established, the devices will randomly hop in
frequencies.
alltel wireless Products we recommend
Apple PowerBook Notebook 15.2" M8981LL/A (1.25-GHz PowerPC G4, 512 MB RAM, 80 GB Hard Drive, DVD-R/CD-RW Drive)
Apple PowerBook Notebook 15.2" M8981LL/A (1.25-GHz PowerPC G4, 512 MB RAM, 80 GB Hard Drive, DVD-R/CD-RW Drive)
If you're one of those people who simply want it all, look no further than the new 15-inch PowerBook G4. Just over an inch thin, weighing only 5.6 pounds, and sporting a 15.2-inch (diagonal) widescreen display, this system incorporates all the best performance features of the PowerBook line tucked neatly into a sleek aluminum design.Built-in antennas make wireless networking a snap. With an AirPort Extreme Card, you can connect to an 802.11g wireless network at speeds up to five times faster than conventional Wi-Fi networks. Integrated Bluetooth technology extends your wireless capabilities with cable-free connections to the ever-growing roster of Bluetooth-enabled devices, including Apple's new wireless mouse and keyboard. The wired world is easily accommodated by a suite of high-speed digital connections, including Gigabit Ethernet, DVI, FireWire 800, and USB 2.0.With its intelligent combination of features, the 15-inch PowerBook gives you the freedom to edit video, deliver presentations, or analyze data on the go - in short, to get your work done, anywhere.
USB Bluetooth Adapter Class I
USB Bluetooth Adapter Class I
The HBTC2 Bluetooth Class 1 USB Adapter allows users to make quick and effortless connections between notebooks, mobile phones, portable and handheld devices. It transmits voice and data through radio waves at fast Bluetooth speeds up to 723Kpbs and distances of up to 100 meters, while the Bluetooth specification ensures protection from interference and seeks to ensure security of data.
Troy WNDPT-001 WindPort Bluetooth PC Card for Laptop Computers
Troy WNDPT-001 WindPort Bluetooth PC Card for Laptop Computers
The TROY WindPort is a PC adapter card that enables laptop PCs to send data across a Bluetooth wireless communications link at distances up to 10 meters using many existing application programs. With WindPort, you can work wherever it is convenient, and you'll never need to find a cable when you need to communicate with other devices like printers. The WindPort plugs into any free PCMCIA slot on virtually any kind of Windows compatible laptop computer. It works with Windows 98, ME, and 2000, and supports most of the major Bluetooth protocols and profiles, as well as Bluetooth authentication and encryption.
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Sun, 24 Feb 2008 08:31:37 GMT
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