Transmission Questions

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21.

A _________ digital signal includes timing information in the data being transmitted.

A

self-synchronizing

B

self-modulated

C

self-transmitted

D

none of the above

Correct Answer: A

None.

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22.

In decoding a digital signal, the receiver calculates a running average of the received signal power, called the _______

A

baseline

B

base

C

line

D

none of the above

Correct Answer: A

None.

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23.

The most common technique to change an analog signal to digital data is called __________.

A

PAL

B

PCM

C

sampling

D

none of the above

Correct Answer: B

None.

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24.

The first step in PCM is ________

A

quantization

B

modulation

C

sampling

D

none of the above

Correct Answer: C

None.

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25.

There are three sampling methods: __________

A

quantized, sampled, and ideal

B

ideal, sampled, and flat-top

C

ideal, natural, and flat-top

D

none of the above

Correct Answer: C

None.

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26.

In ______ transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte.

A

synchronous

B

asynchronous

C

isochronous

D

none of the above

Correct Answer: B

None.

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27.

. In _________ transmission, we send bits one after another without start or stop bits or gaps. It is the responsibility of the receiver to group the bits.

A

synchronous

B

asynchronous

C

isochronous

D

none of the above

Correct Answer: A

None.

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28.

The signal rate is sometimes called the ____ rate

A

baud

B

bit

C

signal

D

none of the above

Correct Answer: A

None.

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29.

The data rate is sometimes called the ___ rate

A

baud

B

bit

C

signal

D

none of the above

Correct Answer: B

None.

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30.

In a _____ scheme, all the signal levels are on one side of the time axis, either above or below.

A

polar

B

bipolar

C

unipolar

D

all of the above

Correct Answer: C

None.

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