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If the input signal power to a communication system is 1 W and the output power is 1 mW, the system attenuation is: A. 3 dB B. 20 dB C. 30 dB D. 40 dB E. 1000 dB - ✔✔C. 30 dB The signal at the input to a balanced twisted pair cable is 10 mW. The cable is 1000 feet long and has an attenuation of 1 dB per 100 feet. This cable is connected to the input of a receiver. The noise level at the input to the receiver is 1 microwatt. What is the signal-to- noise ratio (SNR) (dB) at the receiver input? A. 10 dB B. 30 dB C. 40 dB D. 60 dB E. 100 dB - ✔✔B. 30 dB A SONET OC-1 channel can carry 672 voice signals and has a data rate of 51.84 Mbps. ASONET OC- 48 channel can carry 32,256 voice channels. What MINIMUM data rate is required for the OC-48 channel? A. 155 Mbps B. 622 Mbps C. 2.5 Gbps D. 5 Gbps
E. 10 Gbps - ✔✔C. 2.5 Gbps All of the following are nominal wavelengths for laser light sources EXCEPT: A. 700 nm B. 850 nm C. 1300 nm D. 1310 nm E. 1550 nm - ✔✔A. 700 nm A video camera has a coaxial cable output. The video signal is to be distributed to devices that have balanced twisted pair inputs. The transition between these two different transmission media can be accomplished by using a: A. Balun B. Converter C. Modulator D. Cross connect E. Transceiver - ✔✔A. Balun The public telephone system is an example of a __________ system. A. Simplex B. Half-duplex C. Full-duplex D. Purely analog E. Purely digital - ✔✔C. Full-duplex Wave division multiplexing (WDM) is most similar to:
B. 0.707A and a frequency of f C. A and a frequency of 2f D. 2A and a frequency of f E. 2A and a frequency of 2f - ✔✔A. Zero Composite conductors, although not generally recommended, may be used in special circumstances because they provide all of the following advantages EXCEPT: A. Have good digital transmission characteristics B. Lightweight C. Inexpensive D. Easy to produce E. Easily embedded into other materials - ✔✔A. Have good digital transmission characteristics Which is an advantage of stranded conductors over solid conductors? A. Less costly B. Simpler terminations C. Better high frequency performance D. More flexible - ✔✔D. More flexible The conversion of an analog speech signal to a pulse code modulation (PCM) digital signal involves all of the following steps EXCEPT: A. Low pass filtering B. Periodic sampling C. Quantizing D. Companding E. Amplitude modulation - ✔✔E. Amplitude modulation
Assume that the optical power transmitted by a 62.5/125 multimode fiber is distributed uniformly across its core. If this fiber is perfectly coupled (i.e., the two fibers are aligned and abutted) to a 50/125 fiber, what is the percent of power that is lost? A. 0 percent B. 36 percent C. 50 percent D. 80 percent E. 100 percent - ✔✔B. 36 percent Which of the following correctly lists the lowest frequency band to the highest frequency band? A. MF, HF, VHF, UHF B. UHF, VHF, HF, MF C. HF, MF, UHF, VHF D. VHF, UHF, MF, HF E. HF, MF, UHF, VHF - ✔✔A. MF, HF, VHF, UHF Time division multiplexing (TDM) systems are designed to transport ________ between end point systems. A. Only analog signals B. Only digital signals C. A mix of both analog and digital signals D. Both analog and digital signals, but only one type at a time - ✔✔B. Only digital signals A reasonable approximation for the signal speed in 100 ohm balanced twisted pair cable is__________, where c is the velocity of light in free space.
You are placing Category 6 unshielded twisted-pair (UTP) in cable tray down a hallway past the elevator mechanical room. What action should you take to avoid effects of electromagnetic interference (EMI)? A. Provide a minimum separation of 1194 mm (47 in) B. Provide a minimum separation of 2060 mm (81 in) C. Require the architect to install metallic foil shielding on the mechanical room walls D. Provide RMC/IMC (rigid metallic conduit/intermediate metal conduit) through all areas within 4.6 m (15 ft) of the mechanical room - ✔✔A. Provide a minimum separation of 1194 mm (47 in) You have discovered a common mode current on the metallic cable sheaths of your building riser cables. What is the MOST likely cause for you to investigate? A. Lack of cable protection B. Two separate and distinct ground references C. Improper secondary protection D. Improper physical protection of cable E. Improper placement and/or termination of cables - ✔✔B. Two separate and distinct ground references What is the recommended MINIMUM separation of unshielded twisted-pair (UTP) cables from fluorescent light fixtures? A. 77 mm (3 in) B. 30 mm (5.12 in) C. 203 mm (8 in) D. 324 mm (12.75 in) E. 483 mm (19 in) - ✔✔B. 30 mm (5.12 in) You are required by architectural design to place UTP cables in the same space as unshielded power lines. How should you proceed with the placement of your cables?
A. Require the architect/electrical engineer to place shielding in the space before your UTP is placed. B. You should provide a minimum separation of 610 mm (24 in). C. You should provide a minimum separation of 229 mm (9 in). D. You should provide a minimum of two 101 mm (4 in) RMC. - ✔✔B. You should provide a minimum separation of 610 mm (24 in). Which of the following is NOT a form of signal coupling between two (2) circuits? A. Conductive B. Inductive C. Reactive D. Capacitive E. Electromagnetic - ✔✔C. Reactive A common mode (CM) signal can be converted to a differential mode (DM) signal as a result of a(n): A. Unbalanced circuit B. Grounded circuit C. Poorly timed signal D. Improper dielectric material - ✔✔A. Unbalanced circuit The electromagnetic spectrum of visible light lies in the ___________ frequency range of the spectrum. A. 1 GHz B. 100 GHz C. 10 THz D. 1 PHz E. 100 PHz - ✔✔D. 1 PHz
A. Electromagnetic interference (EMI) B. Radio Frequency Interference (RFI) C. (EMC) D. Fast transients E. Electrostatic Discharge (ESD) - ✔✔C. (EMC) Which of the following is NOT a source of electromagnetic interference (EMI)? A. Copiers - B. Transformers - C. Incandescent lights - D. Fluorescent lights - E. Electrical power supply cable - ✔✔C. Incandescent lights - If looking to specify an optical fiber backbone within a building going 275 m (902 ft) between the equipment room (ER) and the telecommunications room (TR), what type of fiber should be specified to support a 10 GB ethernet application? A. OM B. 50 micron multimode C. 50 micron laser optimized multimode D. 62.5 micron multimode - ✔✔C. 50 micron laser optimized multimode What type of optical fiber is used primarily for outside plant (OSP) applications? A. Tight-buffer B. Loose-tube C. Breakout style D. Duplex zip cord
E. Ribbon - ✔✔B. Loose-tube What is the insertion loss guideline for a multimode mechanical splice? A. 0.05 dB B. 0.1 dB C. 0.3 dB D. 0.5 dB E. 1.0 dB - ✔✔C. 0.3 dB What is the International Organization for Standardization/International ElectrotechnicalCommission ISO/IEC class rating for American National StandardsInstitute/Telecommunication Industry Association (ANSI/TIA) Category 5e cable? A. Class B B. Class C C. Class D D. Class E E. Class F - ✔✔C. Class D There are three buildings approximately 400 meters apart and the customer wants to use10 Gig Ethernet. What fiber should be specified for this application? A. 8 - 9 micron singlemode B. 50 micron multimode C. 50 micron laser optimized multimode D. 62.5 micron multimode - ✔✔A. 8 - 9 micron singlemode Which of the following is true about screened twisted pair cable assemblies?
C. N-Style D. SMA E. Ultra high frequency (UHF) - ✔✔A. F-Style You must extend a video systems backbone coax cable that was recently installed. Which of the following coaxial cable types would provide the best performance for both analog and digital video? A. Series 6 B. Series 11 C. RG 16 D. RG 59 E. RG 62 - ✔✔B. Series 11 The RJ-45 is now known as the 8P8C style connector, per the Telecommunications Industry Association (TIA) standard. What does the P and C stand for? A. Plug and connector B. Position and connector C. Position and contact D. Plug and contact - ✔✔C. Position and contact What is the testing frequency of a Category 6/Class E cable? A. 100 MHz B. 200 MHz C. 250 MHz D. 500 MHz E. 600 MHz - ✔✔C. 250 MHz
What type of fiber optic cable is manufactured to protect individual glass strands and is primarily designed for use inside buildings? A. Ribbon B. Tight buffered C. Loose tube D. Air blown - ✔✔B. Tight buffered The ability of a conductors insulation to transmit an electric field is called: A. Conductivity B. Transmitability C. Permittivity D. Capacitance E. Reactance - ✔✔C. Permittivity This type of cable is an unbalanced system: A. Unshielded twisted-pair (UTP) B. Shielded twisted-pair (STP) C. Screened twisted-pair (ScTP) D. Coaxial - ✔✔D. Coaxial What is the frequency rating of an International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) Category 7/Class F cable? A. 100 MHz - B. 250 MHz - C. 500 MHz -
Which of the following is NOT a type of connector for optical fiber? A. LC B. ST C. SFF D. S/FTP E. SC - ✔✔D. S/FTP When specifying telecommunications outlet boxes, all of the following should be considered EXCEPT: A. Outlet box shall be a minimum of 100 mm (4 in) x 100 mm (4 in) x 76 mm (3 in) B. Outlet boxes should be installed near an electric outlet at the same height C. Different outlet boxes have different support requirements D. Floor mounted telecom outlet boxes should be coordinated with furniture to minimize the potential trip hazard E. Outlet boxes must be of adequate size so that minimum cable bend radius requirements are not exceeded - ✔✔A. Outlet box shall be a minimum of 100 mm (4 in) x 100 mm (4 in) x 76 mm (3 in) Assuming the total fill capacity of a pathway is 100 cables (all of the same cable type and size), the MAXIMUM number of cables to be installed during the initial installation, without exceeding the fill ratio is: A. 25 B. 40 C. 50 D. 60 - ✔✔B. 40 When installing outlet boxes in ten private offices in an area which may prove to be difficult to install future additional telecommunications outlets, the MINIMUM quantity of outlet boxes that should be installed is:
A. 10
B. 20
C. 30
D. Based on the type of cabling specified - ✔✔B. 20 Important considerations when designing telecommunications distribution within modular furniture include all of the following EXCEPT: A. How the furniture pathways will be connected to horizontal building pathways B. Separation of telecommunications cabling and electrical power C. Diameter of cable to be installed D. Maximum initial fill ratio of 40 percent when derated because of corners - ✔✔D. Maximum initial fill ratio of 40 percent when derated because of corners Which of the following is NOT true about consolidation points? A. They are not to be used for direct connections to active equipment. B. They allow horizontal cables to be extended into work area pathways. C. They are to be terminated on separate connectors for each individual user. D. The maximum length of cable from the consolidation point (CP) to the outlet varies by media type. - ✔✔D. The maximum length of cable from the consolidation point (CP) to the outlet varies by media type. In a run requiring 15 m (50 ft) of cable between the floor distributor and the consolidation point, the MAXIMUM length of cable allowed between the CP and the telecommunications outlet is: A. 27.4 m (90 ft) B. 36.5 m (120 ft) C. 45.8 m (150 ft) D. 75 m (242 ft)
A. 9.3 m 2 (100 ft 2) B. 23 m 2 (250 ft 2) C. 31 m 2 (330 ft 2) D. 56 m 2 (600 ft 2) E. 84 m 2 (904 ft 2) - ✔✔B. 23 m 2 (250 ft 2) The standard floor space coverage area for each building automation system (BAS) is a BAS outlet or device for every ________ of floor space. A. 9.3 sq m (100 sq ft) B. 23 sq m (250 sq ft) C. 31 sq m (330 sq ft) D. 56 sq m (600 sq ft) E. 84 sq m (904 sq ft) - ✔✔B. 23 sq m (250 sq ft) Cables are installed in a ceiling in a straight line. The ceiling run is 60 m (200 ft) in length. What is the MINIMUM number of J-hooks required to support the cables? A. 20 B. 30 C. 40 D. 50 E. 60 - ✔✔C. 40 You are designing a horizontal distribution system that will have a zone box located 71.6 m(235 ft) away from the telecommunications room (TR). A 50 mm (2 in) conduit is designed from the TR to a pull box located 36.6 m (120 ft) away from the TR. A 1 1/2 inch conduit is designed from the pull box to the zone box located 35.1 m (115 ft) beyond the pull box. Assuming no conduit bends, and excluding the TR and zone box, what is the total number of pull boxes/pull points required in this horizontal conduit system between the telecommunications room (TR) and zone box?
A. 2
B. 3
C. 4
D. 5 - ✔✔B. 3
The MINIMUM finished height of access flooring in a general office area is: A. 50 mm (2 in) B. 150 mm (6 in) C. 200 mm (8 in) D. 250 mm (10 in) E. 300 mm (12 in) - ✔✔C. 200 mm (8 in) Using the "pathway design" for horizontal cable distribution, how many cable runs are placed to serve 15 individual? A. 15 B. 30 C. 45 D. 60 - ✔✔C. 45 In the ceiling zone method of distribution, the usable floor area should be divided into zones each measuring: A. 9.3 sq m (100 sq ft) to 23 sq m (250 sq ft) B. 23 sq m (250 sq ft) to 56 sq m (600 sq ft) C. 23 sq m (250 sq ft) to 84 sq m (904 sq ft) D. 56 sq m (600 sq ft) to 84 sq m (904 sq ft)
