Latest Technical Interview Answers - 12

Latest Technical Interview Answers - 12

What is the strength of the signal transmitted by powerful cell phones?
Posted:
The powerful cell phones can transmit a signal of 3 watts.

What is the frequency range used for Bluetooth in Japan?
Posted:
2472 to 2497 MHz is the frequency range used for Bluetooth in Japan.

Which method is used for Data transfer?
Posted:
Asynchronous Connectionless (ACL) is Data transfer method in Bluetooth

what is the total number of masters and slaves in a piconet?
Posted:
1 Master and 7 Slaves.

How many SCO links are there in a piconet?
Posted:
In a piconet, there can be up to three SCO links of 64,000 bits per second each.

Which Bluetooth version uses adaptive frequency hopping? Why?
Posted:
In Version 1.2 Adaptive frequency hopping method is used, which improves resistance to radio interference, and provides higher transmission speed.

What are the other (competing or not) wireless technologies?
Posted:
Wi-Fi, IrDa, EDGE, UWB (Ultra Wide Band)

What is a Bluetooth dongle?
Posted:
A device that hangs outside of a computer, or phone to provide Bluetooth connection.

How does Bluetooth use frequency hopping for security? Posted:
Bluetooth picks a random frequency out of 79 and then hops around the range about 1600 times per second.

List some Technology characteristic of Bluetooth?
Posted:
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.

What is the frequency range used for Bluetooth in Europe and United States?
Posted:
2402 MHz to 2480 MHz are the frequency ranges used in USA and Europe.

Which method is primarily used for Voice transfer?
Posted:
Synchronous Connection Oriented (SCO) is a method primarily used for Voice transfer.

What is FEC in Bluetooth?
Posted:
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.

What are the three main types of connection used by Bluetooth?
Posted:
Single slave, Master slave, Scatternet .

What is Piconet? - Posted:
A collection of devices connected through Bluetooth technology in an ad hoc fashion.

What is Airport?
Posted:
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.

Bluetooth signals do not interfere with our PCs or cordless phones or portables. Why?
Posted:
Bluetooth uses low-power signals, it plays around in 2.45 GHz range, while most of consumer devices would be using 900 MHz.

Which technology is used in Bluetooth for avoiding interference?
Posted:
Frequency hopping is the technology used in Bluetooth.

Under what frequency range does Bluetooth work?
Posted:
2.45 GHz is the frequency range.

What is FCC and how does it relate to Bluetooth?
Posted:
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.