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1.Why is Bluetooth called a cable
replacement technology? - Bluetooth
technology allows the creation of
Personal Area Networks without cables or
wires that are usual in home networks.
2.Give a generic description of
Bluetooth? - Bluetooth is a low-cost,
short-range (RF) links between mobile
PCs, mobile phones and other portable
devices. Bluetooth can transmit through
solid, non-metal objects.
3.Why can Bluetooth equipment integrate
easily in TCP/IP network? - Because
Bluetooth uses wireless LAN standards
IEEE for data transmission.
4.Is it possible to connect multiple
Bluetooth hubs? - No, only one hub can
be used at a time with a computer. USB
or Serial devices can be added.
5.What is FCC and how does it relate to
Bluetooth? - FCC is Federal
Communication Commission, which issues
licenses to the stations for specific
frequencies. It also decides who is able
to use which frequency for what purpose.
Since Bluetooth is using unlicensed
spectrum, FCC has no direct involvement
with Bluetooth
6.Under what frequency range does
Bluetooth work? - 2.45 GHz is the
frequency range.
7.Do Bluetooth devices need line of
sight to connect to one another? - No.
8.Which technology is used in Bluetooth
for avoiding interference? - Frequency
hopping is the technology used in
Bluetooth.
9.Bluetooth signals do not interfere
with our PCs or cordless phones or
portables. Why? - Bluetooth uses
low-power signals, it plays around in
2.45 GHz range, while most of consumer
devices would be using 900 MHz.
10.What is Airport? - Airport is a
wireless communications system, like
Bluetooth. It is based on the IEEE
802.11 recommendation. It also uses 2.4
GHz frequency band, but its range is
about 45 meters and it boasts a
transmission speed of 11 Mbit/second. It
is developed by Lucent Technologies.
11.What is Piconet? - A collection of
devices connected through Bluetooth
technology in an ad hoc fashion.
What are the three main types of
connection used by Bluetooth? - Single
slave, Master slave, Scatternet .
12.What is FEC in Bluetooth? - Forward
Error Correction is a method by which
Bluetooth increases its noise immunity.
FEC is a method that enables a receiver
to not only detect, but also correct
errors in a transmission.
13.Which method is primarily used for
Voice transfer? - Synchronous Connection
Oriented (SCO) is a method primarily
used for Voice transfer.
14.What is the frequency range used for
Bluetooth in Europe and United States? -
2402 MHz to 2480 MHz are the frequency
ranges used in USA and Europe.
15.List some Technology characteristic
of Bluetooth? - Omni directional,
Adaptive output power to minimize
interference, Support Synchronous &
asynchronous services, Fast Frequency
Hopping to avoid interference, Short
data packets to maximize capacity during
interface.
16.Which company originally conceived
and developed Bluetooth? - Ericsson.
17.How does Bluetooth use frequency
hopping for security? - Bluetooth picks
a random frequency out of 79 and then
hops around the range about 1600 times
per second.
18.What is a Bluetooth dongle? - A
device that hangs outside of a computer,
or phone to provide Bluetooth
connection.
What are the other (competing or not)
wireless technologies? - Wi-Fi, IrDa,
EDGE, UWB (Ultra Wide Band)
19.Which Bluetooth version uses adaptive
frequency hopping? Why? - In Version 1.2
Adaptive frequency hopping method is
used, which improves resistance to radio
interference, and provides higher
transmission speed.
20.How many SCO links are there in a
piconet? - In a piconet, there can be up
to three SCO links of 64,000 bits per
second each.
what is the total number of masters and
slaves in a piconet? - 1 Master and 7
Slaves.
21.Which method is used for Data
transfer? - Asynchronous Connectionless
(ACL) is Data transfer method in
Bluetooth
22.What is the frequency range used for
Bluetooth in Japan? - 2472 to 2497 MHz
is the frequency range used for
Bluetooth in Japan.
23.What is the strength of the signal
transmitted by powerful cell phones? -
The powerful cell phones can transmit a
signal of 3 watts. |
