SWITCHING AND TRANSMISSION FUNDAMENTALS

1. Select the true statements i. One who initiates the call is referred to as “Called Subscriber” ii. One for whom the call is destined is called as “Calling Subscriber” iii. One who initiates the call is referred to as “Calling Subscriber” iv. One for whom the call is destined is called as “Called Subscriber” a. iii, iv b. i, ii c. i, iii d. i, iv

2. Universal Connectivity in telecommunication networks is achieved by the use of a. Switches b. Switching Systems c. Systems d. Switching signals

3. One who demonstrated point-to-point telephone connection a. Gaham Bell b. Graham Bell c. Alex Bell d. None

4. Networks with point-to-point links among all the entities are known as a. Networks b. Complete Network c. Fully Connected Network d. None

5. Switching Systems can be classified as a. Manual b. Automatic c. Electromechanical d. Both a & b

6. Match the following a. CI b. ES c. SC d. OEC

i. Optical to electrical converter ii. Electrical Signal iii. Channel Interface

iv. Signal Conditioner

a. a-ii, b-iii, c-iv, d-ib. a-iii, b-ii, c-i, d-ivc. a-iii, b-ii, c-iv, d-id. a-iii, b-ii, c-i, d-iv

7. Human speech signals are converted to electrical or optical signals before they can be carried by a communication systems by a. Transponders b. Transducers c. Transmitters d. Modulators

8. In Full-duplex communication a. Information transfer takes place in unidirectional b. Information transfer takes place in both the direction c. Both a & b d. None

9. The probability that a user may get blocked is called a. Blocking Network b. Blocking Probability c. Non-blocking Network d. None

10. The traffic in a telecommunication network is measured in a. Erlang b. Elang c. Egang d. None

11. A Switching system provides for a. Subscriber loop signaling b. Inter-exchange signaling c. Intra-exchange or register signaling d. All the above

12. The uniselector was invented by a. Alexander Keith b. Alexander Kith c. Alexander Kier d. None

13. A subscriber may be barred from making certain calls is called as a. Call Priority b. Call Barring c. Call charging d. Origin based routing

14. The important function of Common control subsystem is a. Controlling Network b. Controlling the operation of switching network. c. Controlling Switchesd. None

15. Due to the limitations of the manual Switching Systems ______ systems were introduced a. Automatic Switching b. Automatic signal c. Automatic selection d. None

16. A modern digital telephone contains a. CODEC b. PCM c. SPC d. DEC

17. Nyquist’s Sample theorem states that a. A Waveform must be sampled at a rate greater than twice its bandwidth . b. A Waveform must be sampled at a rate half its bandwidth. c. A Waveform must be sampled at rate same as its bandwidth. d. Both a & b

18. The bit rate for a digital voice channel is a. 46 kb/s b. 64 kb/s c. 66 kb/s d. 50kb/s

19. Select true statements i. Multiplexing is the process where multiple channels are combined for transmission over a common transmission path ii. Two predominant ways of multiplexing are FDM & ADM iii. In ADM each signal will be having a very short duration.

iv. SPC stands for Stored program control.

a. i, iii, iv b. i,ii,iiic. i, iv d. None

20. Given that MTBF=2000hours and MTTR=4 hours, calculate the unavailability for single and dual processor system a. 2 x 10-3 & 8 x 10-6 b. 2x10-6 & 8 x 10-3

c. 2x10-3 & 8x10-5

d. None

21. The application software of a switching system may be divided into a. 4 types b. 3 types c. 2 types d. 5 types

22. Broad categories of Services are a. Services associated with the calling subscriber b. Services associated with the called subscriber c. Miscellaneous services. d. All the above

23. Match the following i. Call Forwarding ii. Automatic redialingiii. Call back when freeiv. Recorded number calls

a. Ring him back when it becomes free.b. Call a predetermined number by simply lifting the handset without dialing any digit whatsoever.c. Most recently dialed number is automatically redialedd. Forward all his calls to another number.

a. i-d, ii-c, iii-a, iv-bb. i-a, ii-b, iii-c, iv-dc. i-d, ii-c, iii-b, iv-bd. i-c, ii-d, iii-a, iv-b

24. _____is an extension of the consultation hold feature. a. Consultation hold

b. Call waiting featurec. Conference call facilityd. None

25. The period 17.00-18.00 hours is characterized by a. Heavy Traffic b. Low Traffic c. Both a & b d. None

26. The ratio of the number of call attempts in busy hour is called as a. BHCA b. BCHA c. CCR d. CRC

27. A subscriber makes three phone calls of three minutes, four minutes and two minutes duration in a one-hour period. Calculate the subscriber traffic Erlangs. a. 0.15E b. 5.4E c. 9E d. 1.5E

28. The traffic models used for studying los systems are known a. Congestion Models b. Queuing Models c. Blocking d. a or c

29. The five-step process of traffic engineering the telephone traffic over a network is i. Collecting the existing voice traffic data ii. Categorizing the traffic by groups iii. Determining the number of physical trunks required to meet the traffic. iv. Determining the proper mix of trunks v. Converting the number of Erlangs of traffic to packets or cells per second.

a. i, ii, iii b. i, iii & iv c. i, ii & v d. All the above

30. VAD stands for a. Voice activity detection b. Voice activity detector c. Voice action detection d. None

31. Short delay echoes are controlled by

using_____ a. Amplifiers b. Attenuators c. Echo Suppressors d. None

32. The long delay echoes are controlled by a. Echo suppressors b. Echo amplifiers c. Echo attenuators d. None

34. The amount by which the reflected signal is attenuated is known as a. Reflection loss b. Return loss c. Reflection gain d. Return gain

35. Select the true statements i. In Inchannel signaling trunks are held up during signaling.ii. In Common channel signaling trunks are not required for signalingiii. In Inchannel signaling, signaling is relatively slow.iv. In Common channel signaling, signaling is significantly fast.

a. i, ii, iii b. i, iiic. All the above d. Only iii

36.Intercity,Intercountry and Intercontinental networks are known as a. LANs b. WANs c. MANs d. All the above

37. PSTN stands for a. Public switched telephone networks. b. Public switched telegraphic networks c. Public switched telephone net d. None

38.Fiber optic networks are suitable for a. LANs and MANs b. Only MANs c. LANs and WANs d. Only LAN

39. Select the true statements i. Microprogrammed Control is Flexible. ii. Hard-wired Control is not flexible. iii. Hard-wired Control is Slower. iv. Hard-wired Control is Faster.

a. i, ii, iii, iv b. i, iii, iic. i, ii d. All the above

40. MDF stands for a. Main Document Frame b. Main Distribution Frame c. Main Distribution Function d. None

41. Subscriber pairs and exchange pairs are interconnected at the MDF by means of a. Jumps b. Connectors c. Jumpers d. Either a or c

42. The two factors limit the Subscriber loop length a. Signaling Limits b. Attenuation Limits c. Amplification Limits d. Both a & b

43. Match the following i. Party Line ii. Concentratorsiii. Carrier Systems

a. Two or more subscribers are connected to one line.b. A concentrator expander is used near the cluster of users and another one at the exchange end.c. Carrier systems employ multiplexing techniques.

a. i-b, ii-a, iii-c b. i-a, ii-b, iii-cc. i-a, ii-c, iii-b d. i-c, ii-b, iii-a

44. In BORSCHT, “B” and “T” stands for a. Battery feed, Test b. Battery fuse, Test c. Battery feed, Testing d. Battery fuse, Time

45. The circuit that performs the 2-wire to 4-wire conversion is called as a. Coding b. Supervision c. Hybrid d. Ringing

46. _______groups are required between

Any two exchanges.a. Two trunk b. Three trunkc. One trunk d. Five trunk

47. Three basic topologies adopted for inter connecting exchanges a. Mesh, & Star b. Mesh, Star & Hierarchy c. Mesh, Star & Delta d. Mesh, Star, Hierarchy & Delta

48. Select the true statements i. The maximum number of circuits to be used in an International calls is 15 ii. The maximum number of circuits to be used in an International calls is 12 iii. The transmission loss is defined in terms of reference equivalents TRE, RRE and ORE. iv. Hierarchical networks are capable of handling heavy traffic.

a. ii, iii & iv b. All the abovec. i, ii, iii d. Only iv

49. Voice traffic is _______ a. Half Duplex b. Full Duplex c. Half or Full Duplex d. None

50. Select the true statements. a. Voice traffic is continuous and Data traffic is Bursty. b. Voice traffic is Error unacceptable and Data traffic is tolerable.c. Voice traffic is Half duplex and Data traffic is Half or Full Duplex.d. In Voice traffic typical line utilization is 85%-95%

a. TTTT b. FFFFc. TFTT d. TFTF

51. S & F switching ay be classified as a. Message Switching b. Packet Switching c. Both a & b d. None

52. Voice circuit service follows the on ______ a. FCFS b. FCLS c. LCFS d. Both a & b

53. Datagram service is normally used for Transmittinga. Short messages of one or two

packet lengths.b. Long messages of one or two packet

lengths.c. Either a or b.d. None.

54. SNA stands for a. System Network Architecture b. System New Architecture c. Systematic Network Architecture d. None

55. In Data Communication Architecture heterogeneity covers a. Systems of different vendors b. Systems under different managements c. Systems of different complexities d. Systems of different technologies

a. Only a & b b. Only d c. All the above d. Only b

56. OSI stands for a. Open Standards Interconnection b. Open System Integrity c. Open Style Interconnection d. Open System Interconnection

57. In protocol hierarchies The session layer is a. 1st Layer b. 4th Layer c. 5th Layer d. 3rd Layer

58. Arrange the Layers in their hierarchies i. The Application Layer ii. The Presentation Layer iii. The Transport Layer iv. The Network Layer v. The Physical Layer vi. The Data Link Layervii. The Session Layer

a. i, ii, iii, iv, v, vi, viib. v, vi, iv, iii, vii, ii, ic. i, iii, iv, ii, v, vid. None

57. The Parent random access protocol used in communication networks is a. AOLHA b. ALOHA c. S-ALOHA d. DAMA

58. ISDN stands for a. Integrated Servicing Digital Network b. Integrated Services Digital Net c. Integrated Services Digital Network d. Integrated Services Digital Norms

59. The factors responsible for the development towards ISDN are a. Sociological or societal needs b. Economic necessities c. Technological developments d. All the above

60. An important advantage of electronic mail is a. To reduce consumption of paper in the office. b. It reduces electricity c. Privacy is ensured as the mail is delivered to individual’s mail box d. Only a, c, d

61. _____is an upgrade to conventional telex service. a. Teletext b. Telex c. Teletex d. None

62. The elements of “Search and Retrieval” service are a. SR-ABORT b. RESULT SET c. SR-RELEASE d. All the above

63. The process of construction of an expert system is known as a. Expert System b. Engineering c. Knowledge Engineering d. None

64. Distribution services are classified as a. Broadcast Services b. Cyclic Services

c. Message services d. Both a & b

65. The voice data integration schemes may be placed under two broad classes. a. Random allocation of BBUs b. Contiguous allocation of BBUs c. Both a & b d. None