Data Questions

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231.

_______ is a standard developed by ITU-T.

A

SONET

B

SDH

C

either (a) or (b

D

neither (a) nor (b

Correct Answer: B

None.

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232.

SONET has defined a hierarchy of signals called ________

A

STSs

B

STMs

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: A

None.

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233.

SDH has defined a hierarchy of signals called ________.

A

STSs

B

STMs

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: B

None.

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234.

An ______ signal is the optical modulation of an STS-n (or STM-n) signal.

A

OC-n

B

TDM-n

C

FDM-n

D

none of the above

Correct Answer: A

None.

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235.

SONET defines _______ layers.

A

two

B

three

C

four

D

five

Correct Answer: C

None.

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236.

SONET is a _______ TDM system

A

asynchronous

B

synchronous

C

statistical

D

none of the above

Correct Answer: B

None.

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237.

A SONET system can use _________

A

STS multiplexers

B

regenerators

C

add/drop multiplexers

D

all of the above

Correct Answer: D

None.

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238.

SONET sends ________ frames per second

A

1000

B

2000

C

4000

D

8000

Correct Answer: D

None.

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239.

. In SONET each frame lasts _______ microseconds

A

20

B

64

C

128

D

none of the above

Correct Answer: D

None.

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240.

An STS-1 frame is made of ________ rows

A

1

B

9

C

90

D

none of the above

Correct Answer: B

None.

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