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Test your basic knowledge |
CWNA Radio Frequency Components Measurements And Mathematics
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 23 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The final component in a wireless medium. It takes the carrier signal that is received from the antenna and translates the modulated signals into 1s and 0s. it then takes this data and passes it to the computer to be processed
received signal strength indicator (RSSI)
receiver
dBd
6 dB rule
2. Gain or increase of power from an antenna when compared to what an isotropic radiator would generate. Another way of phrasing this is 'decibel gain relative to an isotropic radiator'
receive sensitivity
Newton's Inverse Square Law
dBi
decibel (dB)
3. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
link budget
unit of power
isotropic radiator
milliwatt
4. Used by a wireless device to determine if another device is transmitting - also known as a clear channel assessment. An optional 802.11 parameter with a value of 0 to 255. It is designed by the hardware manufacturer as a relative measurement of the R
link budget
dBi
received signal strength indicator (RSSI)
dBm
5. This law states that the change in power is equal to 1 divided by the square of the change in distance
6. Provides approximate values when performing RF math calculations. 4 rules
intentional radiator (IR)
rule of 10s and 3s
milliwatt
decibel (dB)
7. A level of desired signal above What is required
fade margin
isotropic radiator
dBi
antenna
8. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
receiver
isotropic radiator
decibel (dB)
9. The increase in gain of an antenna - conmpared to the signal of a dipole antenna. Another way of phrasing this is 'decibel gain relative to a dipole antenna'
receive sensitivity
dBd
unit of comparison
received signal strength indicator (RSSI)
10. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
system operating margin (SOM)
milliwatt
received signal strength indicator (RSSI)
receiver
11. A point that radiates signal equally in all directions. e.g. sun
point source
dBd
equivalent isotropically radiated power (EIRP)
decibel (dB)
12. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
receive sensitivity
rule of 10s and 3s
transmitter
antenna
13. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
fade margin
isotropic radiator
unit of power
antenna
14. The highest RF signal strength that is transmitted from a particular antenna
unit of comparison
milliwatt
Newton's Inverse Square Law
equivalent isotropically radiated power (EIRP)
15. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
link budget
dBm
antenna
equivalent isotropically radiated power (EIRP)
16. Provides two functions in a communication system. When connected to the transmitter - it collects the AC signal that it receives from the trasmitter and directs - or radiates - the RF waves away from the antenna in a pattern specific to the antenna t
antenna
system operating margin (SOM)
unit of comparison
Newton's Inverse Square Law
17. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
watt
antenna
milliwatt
decibel (dB)
18. A device that intentionally generates and emits radio frequency energy by radiation or induction
fade margin
intentional radiator (IR)
equivalent isotropically radiated power (EIRP)
unit of comparison
19. Doubling the distance between a transmitter and receiver will decrease the received signal by 6 dB. Halving the distance between a transmitter and receiver will increase the received signal by 6 dB
6 dB rule
Newton's Inverse Square Law
watt
unit of comparison
20. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
isotropic radiator
system operating margin (SOM)
watt
dBd
21. A point source that radiates signal equally in all directions. e.g. sun
unit of power
isotropic radiator
dBd
fade margin
22. A unit of power equal to 1/1000 of a watt
fade margin
received signal strength indicator (RSSI)
link budget
milliwatt
23. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
6 dB rule
system operating margin (SOM)
unit of comparison
link budget