MCQs in Synchronous Optical Network (SONET) / Synchronous Digital Hierarchy (SDH)

MCQs in SONET/SDH from the book Data Communications and Networking 4th Edition by Behrouz A. Forouzan. Reviewer in Electronics Systems and Technologies (Communications Engineering).

Multiple choice questions for SONET/SDH

This is the MCQs in SONET/SDH from book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.

The topic discuss the Synchronous Optical Network (SONET) which is a standard developed by ANSI for fiber-optic networks while the Synchronous Digital Hierarchy (SDH) is a similar standard developed by ITU-T. If you skip the summary and important terminology visit SONET/SDH .

Begin and Good luck!

Choose the letter of the best answer in each questions.

1. In SONET each frame lasts _______ microseconds.

  • A)   20
  • B)   64
  • C)   125
  • D)   none of the above

2. A linear SONET network can be __________.

  • A)   multipoint
  • B)   point-to-point
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

3. The path overhead consists of ______ bytes.

  • A)   18
  • B)   9
  • C)   6
  • D)   1

4. _______ is a standard developed by ITU-T.

  • A)   SONET
  • B)   SDH
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

5. A ______ is the portion of the network between two multiplexers.

  • A)   line
  • B)   path
  • C)   section
  • D)   none of the above

6. A ________ is a repeater.

  • A)   ADM
  • B)   regenerator
  • C)   STS multiplexer/demultiplexer
  • D)   none of the above

7. The ______ layer is responsible for the movement of a signal across a physical section.

  • A)   path
  • B)   section
  • C)   photonic
  • D)   line

8. In ______ APS, there is one working line and one protection line. The data are normally sent on the working line until it fails.

  • A)   one-to-one
  • B)   one-plus-one
  • C)   one-to-many
  • D)   none of the above

9. Line overhead consists of ________ bytes.

  • A)   18
  • B)   9
  • C)   6
  • D)   1

10. In SONET, for each frame, the bytes are transmitted __________.

  • A)   from left to the right, bottom to top
  • B)   from left to the right, top to bottom
  • C)   from right to the left, top to bottom
  • D)   from right to the left, bottom to top

11. Each ________in a SONET frame can carry a digitized voice channel.

  • A)   frame
  • B)   bit
  • C)   byte
  • D)   none of the above

12. An STS-1 frame is made ______columns.

  • A)   90
  • B)   9
  • C)   1
  • D)   none of the above

13. The ______ layer is responsible for the movement of a signal from its optical source to its optical destination.

  • A)   line
  • B)   path
  • C)   photonic
  • D)   section

14. The ____ layer is responsible for the movement of a signal across a physical line.

  • A)   line
  • B)   path
  • C)   photonic
  • D)   section

15. An STS multiplexer is a ______ device.

  • A)   four-layer
  • B)   three-layer
  • C)   two-layer
  • D)   one-layer

16. A ring SONET network can be _________.

  • A)   bidirectional
  • B)   unidirectional
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

17. _______ is a standard developed by ANSI for fiber-optic networks.

  • A)   SDH
  • B)   SONET
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

18. An add/drop multiplexer is a ______ device.

  • A)   four-layer
  • B)   three-layer
  • C)   two-layer
  • D)   one-layer

19. In SONET, for each byte, the bits are transmitted ____________.

  • A)   from most significant to the least significant
  • B)   from least significant to the most significant
  • C)   three at a time
  • D)   two at a time

20. A _______ is the optical link connecting two neighbor devices.

  • A)   path
  • B)   line
  • C)   section
  • D)   none of the above

21. A ______is the end-to-end portion of the network between two STS multiplexers.

  • A)   line
  • B)   path
  • C)   section
  • D)   none of the above

22. The _______ layer corresponds to the physical layer of the OSI model.

  • A)   photonic
  • B)   path
  • C)   line
  • D)   section

23. SONET is a _______ TDM system.

  • A)   statistical
  • B)   asynchronous
  • C)   synchronous
  • D)   none of the above

24. An STS-3 frame is made of ______ rows.

  • A)   27
  • B)   9
  • C)   1
  • D)   none of the above

25. SONET defines _______ layers.

  • A)   five
  • B)   four
  • C)   three
  • D)   two

26. In ________ APS, there are normally two lines: one working line and one protection line. Both lines are active all the time.

  • A)   one-to-one
  • B)   one-to-many
  • C)   one-plus-one
  • D)   none of the above

27. __________ allow insertion and extraction of signals.

  • A)   STS multiplexer/demultiplexers
  • B)   regenerators
  • C)   ADMs
  • D)   none of the above

28. An STS-3 frame is made of ________ columns.

  • A)   270
  • B)   90
  • C)   9
  • D)   none of the above

29. SONET has defined a hierarchy of signals called ________.

  • A)   STMs
  • B)   STSs
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

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

  • A)   FDM-n
  • B)   OC-n
  • C)   TDM-n
  • D)   none of the above

31. A regenerator is a ________ device.

  • A)   three-layer
  • B)   one-layer
  • C)   two-layer
  • D)   four-layer

32. An STS-1 frame is made of ________ rows

  • A)   90
  • B)   9
  • C)   1
  • D)   none of the above

33. SDH has defined a hierarchy of signals called ________.

  • A)   STMs
  • B)   STSs
  • C)   either (a) or (b)
  • D)   neither (a) nor (b)

34. To make SONET backward-compatible with the current hierarchy, its frame design includes a system of ____.

  • A)   VTs
  • B)   STSs
  • C)   STMs
  • D)   OCs

35. SONET network topologies can be __________.

  • A)   ring
  • B)   mesh
  • C)   linear
  • D)   all of the above

36. SONET sends ________ frames per second.

  • A)   8000
  • B)   4000
  • C)   2000
  • D)   1000

37. A SONET system can use _________.

  • A)   regenerators
  • B)   add/drop multiplexers
  • C)   STS multiplexers
  • D)   all of the above

38. In ________APS, there is only one protection line for many working lines. When a failure occurs in one of the working lines, the protection line takes control until the failed line is repaired.

  • A)   one-to-one
  • B)   one-plus-one
  • C)   one-to-many
  • D)   none of the above

39. The section overhead consists of ______octets.

  • A)   18
  • B)   9
  • C)   6
  • D)   1

Check your work.

Complete List of Chapter Quiz in Data Communications and Networking

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credit: Behrouz A. Forouzan© www.PinoyBIX.org

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