Question

QUESTION 1

1. Optical frequencies are not part of the electromagnetic (EM) spectrum.

True

False

QUESTION 2

1. In order to communicate with satellites, frequencies below 30MHz must be used in order to penetrate the ionosphere.

True

False

QUESTION 3

1. Select the correct statement(s) regarding FDM.

		a. Guard bands are used to separate frequency channels
		b. FDM is the only multiplexing method used to combine analog frequency channels
		c.   The bandwidth of the FDM aggregate is equal to the sum of all bandwidth channels plus guard bands
		d. All of the above are correct

QUESTION 4

1. What is true regarding synchronous TDM?

		a. With TDM, time slots for each source are transmitted whether or not the source has data to send. This leads to inefficiencies.
		b. Byte-interleaving is used with synchronous TDM
		c. Time slots are preassigned to sources
		d. All are true

Answer 1

Answer)
QUESTION 1

False - Optical or visible part is also the part of the electromagnetic (EM) spectrum.

QUESTION 2

True - frequencies below 30MHz in the range 3-30 MHz are used to penetrate the ionosphere.

QUESTION 3

d. All of the above are correct - This is because the guard bands separate the frequency channels, DFM is used to combine the analog frequencies, and FDM aggregate is the sum of all bandwidth and also guard bands.

QUESTION 4

d. All are true - As time slots are reserved even when there is no data to send, time slots are assigned already to the source, and also TDM uses byte-interleaving.