Question 1.
Which of the following is a TE1 Device?

a) ISDN Switch
b) NT1
c) PSTN phone
d) ISDN phone or workstation

Answer

Question 2.
Which reference point is the R reference point in the following diagram?

a) 1
b) 2
c) 3
d) 4

Answer

Question 3.
Which of the following reference points is the U reference point, relevant only in North America?

a) 1
b) 2 and 5
c) 3 and 6
d) 4 and 7

Answer

Answers

Question 1.
Which of the following is a TE1 Device?

*** should be no graphic here? -- Ken

a) ISDN Switch
b) NT1
c) PSTN phone
d) ISDN phone or workstation

Answer
d) ISDN phone or workstation

Explanation
A TE1 device is an ISDN-enabled device.

Choices A and B are wrong because they are just meant to distract from the correct answer. Choice C is incorrect because a PSTN phone is a TE2 device.
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Question 2.
Which reference point is the R reference point in the following diagram?

a) 1
b) 2
c) 3
d) 4

Answer
a) 1

Explanation
The R reference point will only be seen with a TE2 device, requiring a terminal adaptor (TA).
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Question 3.
Which of the following reference points is the U reference point, relevant only in North America?

a) 1
b) 2 and 5
c) 3 and 6
d) 4 and 7

Answer
d) 4 and 7

Explanation
Choice D is the correct answer because the U reference point is defined as the reference point between NT1 devices and line-termination equipment in the carrier network. The U reference point is generally only relevant in the United States because in Europe and the rest of the world, the carrier provides the NT1 function.
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