Comms 8 - Wirecom & Cellular- Answers

MITRC REFRESHER COURSE

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ANSWER KEY

When was the first complete sentence ever transmitted by the telephone? a. 1860 b. 1876 c. 1892 d. 1905

a. b. c. d.

13. Dial tone, busy tone and ring back tone are examples of _____ signal. a. Supervision b. Address c. Musical d. Digital

What part of the conventional telephone set the transmitter and receiver unit are located? a. Dial b. Base c. Keypad d. Handset

14. Request for service from the telephone is detected at the Central Office as a. Dial pulses b. Ringing signal c. Flow of loop current d. Battery reversal

The type of transmitter widely used in the conventional telephone set a. Carbon b. Ceramic c. Piezoelectric d. Electromagnetic

15. The maximum length for 1300-ohm signaling or loop resistance using AWG 26 wire with 133.9 ohms per kilometer a. 5.2 km b. 4.7 km c. 7.5 km d. 9.7 km

Who invented the first carbon type transmitter? a. Bell b. Watson c. Gray d. Edison The type of receiver widely used in the conventional telephone set a. Electromagnetic b. Ceramic c. Carbon d. Piezoelectric

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How many unique tones are used for the 12-key dial-tone multi frequency keypad? a. 2 b. 4 c. 7 d. 12

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In the telephone unit, what is produced when the balancing network in a hybrid circuit is intentionally unbalanced slightly so that the small amount of transmitted signal is fed to the receiver of the talking phone? a. Dial tone b. Side tone c. Echo d. Singing

Dial tone Ringing tone Busy tone Congestion tone

12. The signal heard on the telephone line which indicates that the called subscriber sets is in use a. Dial tone b. Ringing tone c. Busy tone d. Congestion tone

Who invented the first practical system for the electrical switching of calls installed in 1892? a. Bell b. Watson c. Edison d. Strowger

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Wirecom & Cellular Telephony

16. With attenuation loss limits at 6 dB, what it the length of cable using gauge 26 with attenuation loss of 1.61 dB per kilometer? a. 1.3 km b. 2.5 km c. 3.7 km d. 4.9 km 17. The attenuation loss limit of the subscriber loop is set at 6dB. What is the maximum length if a 26H88 loading coil with an attenuation of 0.80 dB per kilometer is added? a. 1.5 km b. 3.5 km c. 5.5 km d. 7.5 km 18. The first number of the loaded cable designation 19H44 indicates a. Spacing b. Coil inductance c. Wire gauge d. Attenuation 19. The letter of the loaded cable designation 24B88 indicates a. Spacing b. Coil inductance c. Wire gauge d. Attenuation

The type of dialing possible for telephone set with rotary dial. a. Tone dialing b. Pulse dialing c. Loop dialing d. e&m dialing

20. The last two digit of the loaded cable designation 22E66 indicates a. Spacing b. Coil inductance c. Wire gauge d. Attenuation

10. DTMF stands for a. Digital telephone multimode function b. Dual tone multifrequency c. Dialing time made faster d. Data transmission multiplex filter

21. The Strowger or step-by-step system falls under what type of switching control system? a. Manual b. Progressive

11. The signal heard on the telephone line that indicates readiness of the central office in receiving address or telephone number 1


c. d.


Common Automatic

32. The three digits following the area code a. Zip code b. Bar code c. Exchange code d. Country code

22. What type of control system Crossbar switches are operating? a. Manual b. Progressive c. Common d. Automatic

33. Generically refers to any switching system owner or leased by a business or organization to provide both internal switching function and access to the PSTN a. Private branch exchange b. Public telephone carrier c. Local exchange carrier d. Inter-exchange carrier

23. The kind of telephone system that require the incoming analog signals to be converted to PCM words before being switched a. Analog system b. Digital system c. Step-by-step d. Crossbar system

34. The point where signals are conveyed from one telecommunication network of a telecom operator to another a. Point of interconnection b. Signal transfer point c. Originating point d. Point-to-point

24. A switching network capable of providing a path from every inlet link to every outlet link in the absence of traffic a. Concentration b. Blocking c. Full availability switch d. Crosspoint

35. A private line communications channel of the type provided by communication common carrier for linking two or more points together a. Party line b. Tie line c. DID line d. Trunk line

25. The inability to interconnect two idle lines connected to a switching network due to all possible paths are in use a. Concentration b. Blocking c. Full availability d. Crosspoint 26. Line finder switches are found in what kind of telephone system? a. Step-by-step b. Crossbar c. Digital exchange d. Mobile telephone system

36. The class of exchange with the primary function is to connect between central offices when a direct trunk is not available a. Local b. Gate way c. Toll d. Tandem

27. In the telephone industry, BORSCHT functions are performed by a. Subscriber line interface b. Crosspoint matrix c. Switching network d. Connector switch

37. That part of central office or local exchange which refers to all cables and wires extending outward including supporting structures and associated apparatus connected to the subscriber telephone a. Outside plant b. Power plant c. Inside plant d. Tandem

28. BORSCHT stands for a. Battery, over-voltage protection, ringing, supervision, coding, hybrid and testing b. Battery, on-hook, regulator, surge protect, circuit, hybrid and test c. Name of a leading manufacturer of telephone system d. Acronym for the developers of computer

38. Trunk signaling within the operative voice-band spectrum a. In band b. Out of band c. Channel associated d. Common channel

29. The location where all subscriber lines are terminated and switching equipment facility is installed a. Central office b. Toll office c. Gate way d. Tandem

39. Type of channel signaling where signal travels with the voice channel a. In band b. Out of band c. Channel associated d. Common channel

30. A series of numbers dialed from the telephone in order to use the telecom service such as direct distance dialing a. Zip code b. Access code c. Address d. Exchange code

40. Type of channel signaling where a completely independent channel carry signals of many traffic channels a. In band b. Out band c. Channel associated d. Common channel

31. The three-digit code used in long distance dialing that is assigned to toll center a. Zip code b. Area code c. Exchange code d. Country code

41. Transmission term corresponding to E & M signals a. 2 wire b. 4 wire c. 8 wire d. 16 wire 2


ANSWER KEY


42. E & M stands for a. Ear and mouth b. Encode and match c. Electricity and magnetism d. Expander and multiplexer

52. Geographic area in which telephone services, numbering assignments and rates are the same a. Exchange area b. City block c. Regional area d. Country

43. E & M is for interoffice trunk while _____ is for subscriber line a. Loop b. 4 wire c. Tone d. Data

53. When a modulation signal is periodically sampled, a _____ wave is produced a. TDM b. PCM c. PAM d. PPM

44. It is the means of transferring line or network related control information between telephone and central office or between central office a. Signaling b. Dialing c. Switching d. Multiplexing

54. What is the sampling rate used in PCM a. 3.4 kHz b. 4.0 kHz c. 8.0 kHz d. 64 kHz

45. A common channel signaling system for use between stored program controlled exchanges, designed for use in digital environment a. Signaling system no. 4 b. Signaling system no. 5 c. Signaling system no. 6 d. Signaling system no. 7

55. The process of assigning discrete value to a PAM signals in PCM a. Sampling b. Quantization c. Equalization d. Multiplexing 56. Continuous one hour period which has the maximum average traffic intensity a. Busy hour b. Traffic quantity c. Grade of service d. Erlang

46. To interconnect system of different characteristics by resolving their incompatibilities a. Boundary b. Interface c. Converter d. End office

57. The aggregate engagement time or occupancy time of one or more traffic paths a. Busy hour b. Traffic quantity c. Grade of service d. Erlang

47. Sampling theorem states that the rate of sampling must at least be _____ the highest frequency component a. Half b. Twice c. Equal d. Ten times

58. A measure of the probability that a call offered to a group of trunks or circuits will fail to find idle circuit at the first attempt a. Busy hour b. Traffic quantity c. Grade of service d. Erlang

48. Sampling theorem is also known as a. Shannon b. Nyquist c. Norton d. Thevenin 49. A process in which more than one signal at a time is translated over a signal link, route or channel a. Synchronization b. Multiplexing c. Concentration d. Encoding

59. The consultative body with the primary purpose of promoting compatibility between communications practices and performance standards of various nations in the field of telephony and telegraphy a. CCITT b. CCIR c. FCC d. IEEE

50. The modulation technique where signals are sampled periodically and each sample is quantized and transmitted as a digital binary code a. TDM b. PCM c. PAM d. PPM

60. Using a cellular phone outside your home service area a. Long Distance Communications b. Roaming c. Global Communications d. Jamming 61. What is the meaning of AMPS which is the standard for analog cellular telephones? a. Advanced Mobile Phone Service b. Automatic Mobile Phone System c. Analog Mobile Passband System d. Amplitude Mixing Phone Standard

51. What multiplexing technique is used in PCM? a. TDM b. PCM c. PAM d. PPM

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62. The time spent on a cellular phone which is usually billed to the subscriber on a per minute system. a. Time division system b. Airtime c. Duration d. Interval

c. d.

Personal Handy Phone Nationwide Communication Services

71. A special fee that local telephone companies are allowed to charge all telephone customers for the right to connect with the local phone network. a. Airtime fee b. Access fee c. Connection fee d. Mandatory fee

63. Channel is known as the width of the spectrum band taken up by a radio signal which is measured in kilohertz (kHz). What is the width of the channel used by most analog cellular phones? a. 50 kHz b. 60 kHz c. 40 kHz d. 30 kHz

72. A means of increasing the capacity of a cellular system by subdividing or splitting cells into two or more smaller cells. a. Spectrum allocation b. Cell allocation c. Channel splitting d. Cell splitting

64. A digital technology that uses a low power signal spread across a wide bandwidth. With this technology, a phone call is assigned a code instead of a certain frequency. Using the identifying code and a low power signal, a large number of callers can use the same group of channels. a. Time Division Multiple Access b. Pulse Code Division Multiplexing c. Pulse Multiple Access d. Code Division Multiple Access

73. A process that provides security for wireless information. Information is encoded so that it can be ready by a device with a matching decoding procedure. a. Wireless decoder b. Cellular decoder c. Encryption d. Decoder

65. A central computer that connects a cellular phone call to the public telephone network. It controls the entire system’s operation, including monitoring calls, billing and handoffs. a. Personal Communications Services b. Wide Area Network Computer c. Mobile Telephone Switching Office d. International Standards Organization

74. An important safety feature that’s included with most of today’s car phones. It permits the driver to use his cellular car phone without lifting or holding the handset to his ear. a. Hands-free b. Hands-off c. Handy phone d. Safety phone

66. What is the meaning of IS-54 which is the dual mode (analog and digital cellular standard in North America? In the analog mode, this conforms to the Advanced Mobile Phone Service. a. Interim Standard Number 54 b. International Standard Number 54 c. Integrated Systems Number 54 d. Industry Standard Number 54

75. A cellular phone feature that automatically blows the car’s horn if a call comes in, alerting the recipient standing nearby. a. Alert mode b. Warning horn c. Call horn d. Alert mode 76. An important feature of a cellular phone subscribing of a voice mail which indicates a light or other indicator announcing that a phone call came in. a. Alert mode b. Call alert c. Message alert d. Voice mail alert

67. A phone that operates on both analog and digital networks. a. Dual system b. Coupled system c. Paired-mode system d. Dual-mode system 68. The geographic area by a single low-power transmitter/receiver. It categorizes a cellular system’s service area. a. Channel b. Service area c. Site d. Cell

77. A sophisticated service provided by a cellular carrier that automatically transfers an incoming cellular call to another phone number if the cellular subscriber is unable to answer. a. Call forwarding b. Call transfer c. Call waiting d. No-answer transfer

69. Radio frequencies assigned in one channel in a cellular system are limited to boundaries of a signal cell because of their low power. The carrier is free to use the frequencies again in other cells in the system without causing interference. What do you call this method? a. Frequency assignment b. Channel utilization c. Frequency reuse d. Optimum frequency assignment

78. The periods of time during which the carriers offer discounted airtime charges, usually available after 10 p.m. and before 6 a.m., on weekends and holidays. a. Night time b. Lean time c. Off-peak d. peak

70. A loosely defined future universal telecommunications service that will allow “anytime, anywhere” voice and data communication with personal communication devices. a. Personal Communications System b. Universal Telephone Service

79. The standard cellular antenna for a car which prefers to the springlike section in the lower third of the antenna known as a phasing coil. a. Pigtail antenna b. Omnidirectional antenna 4


c. d.

ANSWER KEY


Whip antenna Flexible antenna

90. A special signal tone that is transmitted to the cell site to free the voice channel when the mobile terminates a cell. a. 10 KHz b. 20 KHz c. 30 KHz d. 25 KHz 91. In the CDMA Cellular technology, the signal meant for a given user is tagged with a distinctive _____ pattern that only the user’s receiver can recognize. a. PIN Code b. PN Code c. SIM d. IMSI 92. In a Cellular network, if you split a cell originally containing a maximum of 20 channels into two cells, the theoretical total channel capacity is a. 10 b. 20 c. 30 d. 40 93. In wireless communications, a radio channel consists of _____ frequencies within the RF spectrum, which allow a cell site and a wireless phone to transmit and receive signals simultaneously. a. 2 b. 3 c. 4 d. 5 94. A GSM security measure which is designed to prevent eavesdropping of user data on the radio path a. IMSI b. TMSI c. IMEI d. MSRN 95. The uplink frequency range for GSM900 a. 935 – 960 MHZ b. 890 – 915 MHz c. 935 – 960 MHz d. 890 – 915 MHz 96. The geographic area served a single-power transmitter/receiver. It categorizes a cellular system’s service area. a. Channel b. Service area c. Site d. cell 97. Best described as an amplifier used in radio telephony. a. Class A b. Class B c. Class C d. Magnifier 98. This is the Nordic analog mobile radio telephone system originally used in Scandinavia. a. NMT b. GSM c. PCN d. PCS 99. It is a one-way wireless messaging which allows continuous accessibility to someone away from the wired communications network. a. Paging b. Trunked Radio c. Cellular Telephony d. Text Messaging 100. The following are parts of the Trunked Radio System except a. Channels b. Central controller c. Antenna and tower d. 48 volts power supply

80. The type of cellular phone which is installed in a car or truck. This unit is attached to the vehicle, draws its power from the vehicle’s battery and has an external antenna. a. Mobile or car phone b. Portable c. Electronic phone d. Enhanced cellular phone 81. A protected database that holds a copy of the secret key stored in each subscriber’s SIM card a. HLR b. VLR c. AuC d. EIR 82. The time which a cellular subscriber uses a carrier’s service charged per unit time of call a. Talk time b. Air time c. Stand-by time d. Hand off time 83. The Subscriber’s Identity Module (SIM) Card for GSM contains a/n _____ number that identifies the user to the network along with other user and security information. a. IMEI b. IMSI c. ESN d. MIN 84. The modulation technique in cellular communications wherein each message is assigned with a frequency, which is unique to a particular cell. a. NBFM b. NBDT c. PCM d. Modem 85. A channel used for the transmission of supervisory information from a cell site to a mobile station or vice versa. a. Speech b. Control c. Common d. Voice 86. The database for good and known IMEI’s a. White b. Black c. Grey d. red 87. A means of increasing the capacity of a cellular system by subdividing cells into two or more smaller cells. a. Spectrum allocation b. Cell allocation c. Channel splitting d. Cell splitting 88. A database used for management of mobile subscriber. a. HLR b. VLR c. MSC d. EIR 89. The following are the supervisory audio tones used in cellular phones except a. 5970 Hz b. 6000 Hz c. 6030 Hz d. 3925 Hz 5

Comms 8 - Wirecom & Cellular- Answers

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