Question 1.
Which of the following from the illustration is a TE1 device?

a) The ISDN switch
b) The NT1
c) The PSTN phone
d) The 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
e) 5

Answer

Question 3.
Which of the reference points in the illustration is a 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 from the illustration is a TE1 device?

a) The ISDN switch
b) The NT1
c) The PSTN phone
d) The ISDN phone or workstation

Answer
d) The ISDN phone or workstation

Explanation
A TE1 (Terminal Equipment type 1) device is an ISDN enabled device like an ISDN phone or workstation. A PSTN phone is a TE2 (Terminal Equipment type 2) device. ISDN switches and NT1s are not ISDN terminal equipment of any type.
[3835]

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

a) 1
b) 2
c) 3
d) 4
e) 5

Answer
a) 1

Explanation
The R reference point is seen only with a TE2 (Terminal Equipment type 2) device requiring a terminal adaptor (TA).
[3836]

Question 3.
Which of the reference points in the illustration is a 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
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.
[3837]