Bluetooth is a simple type of wireless networking that can allow
up to eight devices to be connected together in a mini-network. It is very
short range in operation, and so is considered to be for 'personal' networking.
Bluetooth uses the 2.4 GHz spectrum to communicate a 1 megabit connection
between 2 devices for both a voice channel and a 768k data channel. The
Bluetooth specification calls for different profiles such as voice and serial
emulation to be used by devices to communicate.
However interoperability needs to be tested to confirm compatibility of the
higher level protocols that use Bluetooth to communicate between devices.
Version 1.1 allows a Bluetooth device to communicate with up to 8 devices (1
host and 7 slaves).
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Why Bluetooth?
[Q]
While there are many differences, key among them are range, power
consumption and intended use. Bluetooth wireless technology in its most common
implementations has a range of 30 feet (10m), is low-power consuming, designed
for battery operated mobile devices and provides voice, data and audio
connections between devices.
A Bluetooth enabled headset would mean that you can leave your cellphone in
your pocket or briefcase, but still receive incoming phone calls.
It is probably better from a health point of view to have a very low powered
headset close to your head than it is to have a phone that might be generating
100 or even 300 times as much radio energy close to your head.
Bluetooth wireless technology has, from its inception, put great emphasis on
wireless security so that users of this global standard can feel secure while
making their connections.
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Who is SIG?
[Q]
The Bluetooth Special Interest Group (SIG) is a trade association
comprised of leaders in the telecommunications, computing, automotive,
industrial automation and network industries that is driving the development of
Bluetooth wireless technology, a low cost short-range wireless specification
for connecting mobile devices and bringing them to market.
In July of 2002, the Bluetooth SIG established its global headquarter in
Overland Park, Kansas, USA.
When you buy a Bluetooth enabled product, you're not buying it from a company,
or manufacturer, called 'Bluetooth' - you're buying it from a member of a
Bluetooth community.
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Who is BQB?
[Q]
A Bluetooth Qualification Body (BQB) is a person authorized by the
BQRB (Bluetooth Qualification Review Board) to provide services to a Member
seeking Bluetooth product qualification. Members contract directly with a BQB
for qualification services. A BQB is responsible for checking declarations and
documents against requirements, reviewing product test reports, and listing
products on the official database of Bluetooth qualified products. A BQB must
be a Bluetooth SIG Member or employed by a Bluetooth SIG Member. The BQB is an
individual, and is not necessarily affiliated with a test facility or a product
manufacturer.
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What is Class 1 vs. Class 2 ?
[Q]
Depend on Bluetooth Software utilized. Typically,
1 st pairing:10~13 secs
After: Less than 5 secs Class 2 devices have a max output of 4dBm (I think),
which is good for 10m. This is what most headsets and phones are. It makes
sense that Class 2 devices would need less battery power to run, which is why
you see them used for phones and headsets.
Class 1 devices have an output of up to 20dBm, which is good for about 100
meters in transmission range. But a Class 1 dongle can only connect with other
Class 1 devices at long ranges, because the class determines how strong a
signal they transmit, not how weak a signal they can receive.
