BICSI-TDMM-Chapter 1:Optical fiber: Detail View

1)

307. All of the following are optical fiber media commonly used in structured cabling systems, except: a. Twisted-pair copper b. Optical fiber c. Balanced twisted-pair

C. Balanced twisted-pair(Chapter 1: Pg.79)

2)

308. A simple model of a telecommunication system would include all of the following except: a. Transmitter b. Receiver c. Medium d. Converter

D. Converter(Chapter 1: Pg.79)

3)

309. Which of the following converts electrical signals to optical signals for transmission over an optical fiber cable? a. Optical transmitter b. Optical receiver c. Optical medium

A. Optical medium(Chapter 1: Pg.79)

4)

310. All of the following are can be found in optical transmitters except: a. Light emitting diode b. Short wavelength laser compact disc c. Vertical cavity surface emitting laser d. Laser diode e. Modulation frequency

E. Modulation frequency(Chapter 1: Pg.80)

5)

311. Converting the modulated electrical signal into a modulated optical signal is the function of which of the following? a. Transmitter b. Receiver c. Medium

A. Transmitter(Chapter 1: Pg.80)

6)

312. All of the following are characteristics of the light pulses emitted by an optical transmitter and can influence the optical fiber selection, except: a. Center wavelength b. Spectral width c. Emission pattern d. Average power e. Modulation frequency f. Transmitter

F. Transmitter(Chapter 1: Pg.80)

7)

313. Any light source emits light within some range of wavelengths. True or False

True(Chapter 1: Pg.80)

8)

314. Glass optical fibers usually emit light at or near all of the following except: a. 850 nm b. 1300 nm c. 1310 nm d. 1550 nm e. 1610 nm

E. 1610 nm(Chapter 1: Pg.80)

9)

315. Which of the following is the description of (nm)? a. Nominal measurement b. Nanometers c. Normal measurement

B. Nanometers(Chapter 1: Pg.80)

10)

316. Which of the four nominal wavelengths is also known as the center wavelength? a. 850 nm b. 1300 nm c. 1310 nm d. 1550 nm e. All the above f. None of the above

E. All the above(Chapter 1: Pg.80)

11)

317. The recurrence at regular intervals of the EM radiation emitted by optical transmitters could be specified using either frequency or wavelength. True or False

True(Chapter 1: Pg.80)

12)

318. The total power emitted by a transmitter is distributed over a range of wavelengths around a center wavelength. What is this range referred to as? a. Center wavelength b. Average power c. Spectral width

C. Spectral width(Chapter 1: Pg.81)

13)

319. Usually given as the range of wavelengths emitted with an intensity level greater than or equal to one half of the peak intensity level, and is referred to as which of the following? a. Full width half maximum b. Fractional width half maximum c. Fractional width half minimum

A. Full width half maximum(Chapter 1: Pg.82)

14)

320. Wide spectral widths lead to increased dispersion of light pulses as the light pulses propagate through an optical fiber. True or False

True(Chapter 1: Pg.82)

15)

321. The average power of the transmitter is the mean level of power output of a given light source during: a. Measurement b. Modulation c. Mediation

B. Modulation (Chapter 1: Pg.82)

16)

323. The more power a transmitter launches into an optical fiber, the more optical power is available for the loss budget. True or False

True(Chapter 1: Pg.82)

17)

324. Short wavelength lasers and VCSELs launch a much smaller spot size of light, typically ______ μm. a. 10 μm b. 25 μm c. 40 μm

B. 25 μm(Chapter 1: Pg.82)

18)

325. Variations of 1% to 5% in numerical aperture specifications among different optical fiber and suppliers does not usually result in different measurement results. True or False

False(Chapter 1: Pg.83)

19)

326. LEDs have a relatively low modulation frequency and are limited to data rates of ________ Mb/s. a. 226 Mb/s b. 262 Mb/s c. 622 Mb/s

C. 622 Mb/s(Chapter 1: Pg.84)

20)

327. Lasers have a much higher modulation frequency and can support data rates in excess of _______ Gb/s. a. 5 Gb/s b. 10 Gb/s c. 20 Gb/s

B. 10 Gb/s(Chapter 1: Pg.84)

21)

328. All of the following are major types of transmitter light sources except: a. Light-emitting diodes b. Short wavelength lasers c. Vertical cavity surface emitting laser d. Laser diodes e. Long wavelength lasers

E. Long wavelength lasers(Chapter 1: Pg.84)

22)

329. The modulation frequency of LEDs is usually under 200 MHz, but can be as high as ___________ MHz. a. 600 MHz b. 800 MHz c. 850 MHz

A. 600 MHz(Chapter 1: Pg.84)

23)

330. Allowing them to operate at higher data rates, the short wavelength laser, commonly referred to as a CD laser, can exceed _____ GHz. a. 1 GHz b. 3 GHz c. 4 GHz

A. 1 GHz(Chapter 1: Pg.85)

24)

331. CD lasers were the first laser sources introduced for multimode optical fiber. True or False

True(Chapter 1: Pg.85)

25)

332. VCSELs were introduced as a cost effective multimode transmitter for which of the following? a. Gigabit Ethernet b. Fibre Channel c. Multimode d. Both A and B e. All three

D. Both A and B(Chapter 1: Pg.86)

26)

333. One of the characteristics of typical VCSELs is that the spectral width is very a=narrow at _____ to _____ nm root mean square. a. 1 to 3 nm b. 1 to 6 nm c. 1 to 9 nm

B. 1 to 6 nm(Chapter 1: Pg.86)

27)

334. VCSELs launch their full power into 50/125 μm and 62.5/125 μm multimode optical fiber. True or False

True(Chapter 1: Pg.86)

28)

335. Laser diodes are typically more expensive than LEDs and CDs, but the modulation frequencies can exceed _____ GHz. a. 1 GHz b. 3 GHz c. 5 GHz

C. 5 GHz(Chapter 1: Pg.87)

29)

336. The average launched power levels of laser diodes is much higher than LEDs with common values of +1 to -3 dBm into singlemode optical fibers, and these power levels may present a safety hazard if viewed directly. True or False

True(Chapter 1: Pg.87)

30)

337. In a comparison of transmitters, which of the following is considered to be the most expensive? a. LEDs b. CDs c. VCSEL d. Laser

D. Laser (Chapter 1: Pg.88)

31)

338. In a comparison of transmitters, which as an average launched power level of +1.0 to -5 dBm? a. LEDs b. CDs c. VCSEL d. Laser

B. CDs(Chapter 1: Pg.88)

32)

339. Almost all types of optical fiver receivers incorporate a ________ to convert the incoming optical signal to an electrical signal. a. Photo detector b. Optical detector c. Signal detector

A. Photo detector(Chapter 1: Pg.89)

33)

340. All of the following are characteristic parameters of optical fiber receivers except: a. Sensitivity b. Bit error rate c. Dynamic Range d. All the above

D. All the above(Chapter 1: Pg.89)

34)

341. The sensitivity of a receiver specifies the maximum power level an incoming signal must have to achieve and acceptable level of performance. True or False

False(Chapter 1: Pg.89)

35)

342. The fractional number of errors allowed to occur between the transmitter and receiver is known as which of the following? a. Sensitivity b. Bit error rate c. Dynamic Range

B. Bit error rate(Chapter 1: Pg.89)

36)

If the power of the incoming signal falls below the receiver sensitivity, the number of bit errors increases beyond the maximum BER specified for that receiver. True or False

True(Chapter 1: Pg.89)

37)

344. Too much received signal power can compromise the receivers operation and the results can be all of the following except: a. Higher than accepted BER b. Possible physical damage to the receiver c. No signal detection

C. No signal detection(Chapter 1: Pg.89)

38)

345. All of the following are key factors when determining which optical fiber to use in a given application except: a. Active equipment b. Bandwidth c. All the above d. Distance

C. All the above(Chapter 1: Pg.90)

39)

346. When considering the active equipment for a new installation, the heart of the design should be the application to be serviced. True or False

True(Chapter 1: Pg.90)

40)

347. The characteristics of the optical fiber and the capability of the equipment determine how far apart the end points can be. True or False

True(Chapter 1: Pg.90)

41)

348. The end-to-end length of the longest link in the system is a minor consideration in the selection of an optical fiber type or size, even considering the active components. True or False

False(Chapter 1: Pg.90)

42)

349. Increasing the length of a link in active equipment can result in all of the following except: a. Increase in the total attenuation b. Reduced system bandwidth due to dispersion c. Signal distortion caused by DMD where multimode fiber is used d. Increased loss budget

D. Increased loss budget(Chapter 1: Pg.90)

43)

350. If the active equipment las LEDs or VCSELs, then multimode optical fiber of either __________ μm or __________ μm must be used. a. 8/125 μm or 125 μm b. 50/125 μm or 62.5/125 μm c. 62.5/125 μm or 8/125 μm

B. 50/125 μm or 62.5/125 μm(Chapter 1: Pg.91)

44)

If the active equipment has standard laser technology, then singlemode optical fiber 8/125 μm must be used nominally. True or False

True(Chapter 1: Pg.91)

45)

352. All of the following are classes of multimode optical fiber cabling except: a. OM1 b. OM2 c. OM3 d. OM4

D. OM4(Chapter 1: Pg.91)

46)

353. All of the following are classes of singlemode optical fiber cabling except: a. OS1 b. OS2 c. OS3

C. OS3(Chapter 1: Pg.91)

47)

354. Which of the following optical fiber multimode classifications has a minimum bandwidth of 200 and 500 MHz●km at 850 and 1300 nm respectively? a. OM1 b. OM2 c. OM3

A. OM1(Chapter 1: Pg.91)

48)

356. Which of the following optical fiber singlemode classifications has a low water-peak suitable for coarse wavelength division multiplexing specified for 1310, 1383, and 1550 nm? a. OS1 b. OS2 c. OS3

B. OS2(Chapter 1: Pg.91)

49)

357. Balanced twisted-pair cable performance is described using scale based on all of the following except: a. Installed systems b. Individual components c. Applications supported

C. Applications supported(Chapter 1: Pg.92)

50)

358. Which of the following defines installed systems and individual components by categories? a. TIA b. EIA c. EFM

A. TIA(Chapter 1: Pg.92)

51)

359. Which of the following ISO classes/categories is recommended for 600 MHz? a. Class E/Category 6 b. Class F/Category 7 c. Class Fᴀ/category 7ᴀ

B. Class F/Category 7(Chapter 1: Pg.92)

52)

361. The ISDN Primary access (physical layer) is supported using 100-ohm balanced twisted-pair cabling under the ITU-T recommendation X.21. True or False

False(Chapter 1: Pg.93)

53)

360. Which of the following ISO classes/categories is recommended for 250 MHz? a. Class E/Category 6 b. Class F/Category 7 c. Class Fᴀ/category 7ᴀ

A. Class E/Category 6(Chapter 1: Pg.92)

54)

362. Which of the following is the information-carrying capacity of a system? a. Bandwidth b. Distance c. Disperion

A. Bandwidth(Chapter 1: Pg.95)

55)

363. For an optical fiber system, which of the following are not deemed essential determinants of the end-to-end bandwidth? a. Transmitter b. Application c. Optical fiber

B. Application(Chapter 1: Pg.95)

56)

364. Installation techniques cannot adversely affect optical fiber bandwidth or dispersion and therefore field measurements are not required. True or False

True(Chapter 1: Pg.95)

57)

365. Transmitters have bandwidth limitations as they take time to change from a low power to a high power state. This is known as the ___________. a. Augment time b. Expand time c. Rise time

C. Rise time(Chapter 1: Pg.96)

58)

366. Rise time is usually measured from ______ to ______ percent power level. a. 5 to 10 percent b. 10 to 90 percent c. 20 to 100 percent

B. 10 to 90 percent(Chapter 1: Pg.96)

59)

367. In simplified terms, the rise time is assumed to be _________, and at higher data rates it becomes significant. a. Zero b. Zilch c. Zip

A. Zero(Chapter 1: Pg.96)

60)

368. As data is doubled and then doubled again, the effect of nonperfect actual pulse results in more and more distortion. True or False

True(Chapter 1: Pg.96)

61)

369. Which of the following causes a light pulse to broaden in duration as it travels through the optical fiber? a. Scattering b. Distribution c. Dispersion

C. Dispersion(Chapter 1: Pg.98)

62)

370. Instead of bandwidth, the maximum pulse dispersion is frequently used to define system capacity in singlemode systems. True or False

True(Chapter 1: Pg.98)

63)

371. Singlemode dispersion is often a concern in premises applications. True or False

False(Chapter 1: Pg.98)

64)

372. The maximum optical fiber dispersion is usually expressed in ___________. a. Picoseconds b. Nanoseconds c. Seconds

A. Picoseconds(Chapter 1: Pg.98)

65)

373. To calculate _____________, multiply the optical fiber dispersion specification by the source spectral width and the length of the optical fiber link. a. Wavelength b. Link dispersion c. Spectral width

B. Link dispersion(Chapter 1: Pg.98)

66)

374. Dispersion in singlemode systems is a function of _____________. a. Wavelength b. Link dispersion c. Spectral width

A. Wavelength(Chapter 1: Pg.98)

67)

375. Calculating the bandwidth requirements of a multimode system is much less complex than determining the dispersion of a singlemode system. True or False

False(Chapter 1: Pg.98)

68)

376. All of the following are used when calculating and predicting bandwidth in multimode systems, except: a. Transmitter rise time b. Optical fiber modal dispersion c. Chromatic dispersion d. All the above

D. All the above(Chapter 1: Pg.98)

69)

377. The application standards or original equipment manufacturer typically determine the maximum optical fiber bandwidth necessary to support a given system. True or False

False(Chapter 1: Pg.98)

70)

378. The majority of premises applications used today are less than several kilometers, typically optical fiber electronics used an LED transmitter and multimode optical fiber for data rates of ___________ or less. a. 125 Mb/s b. 145 Mb/s c. 155 Mb/s

C. 155 Mb/s(Chapter 1: Pg.98)

71)

379. For data rates of ______ or greater, the VCSEL transmitter is used. a. 155 Mb/s b. 1 Gb/s c. 3 Gb/s

B. 1 Gb/s(Chapter 1: Pg.98)

72)

380. Over short distances, using multimode optical fiber with a minimum modal bandwidth of 160 MHz/km at 850 nm supports data rates above ________ for 2 km (1.2 mi). a. 10 Mb/s b. 15 Mb/s c. 20 Mb/s

C. 20 Mb/s(Chapter 1: Pg.99)

73)

381. The same optical fiber above can support data rates of up to 1Gb/s for distances of up to ___________ when utilizing VCSELs. a. 100 m (328 ft) b. 200 m (656 ft) c. 300 m (984 ft)

C. 300 m (984 ft)(Chapter 1: Pg.99)

74)

382. Modal bandwidth is measured with an overfilled launch condition directly related to LED systems. True or False

True(Chapter 1: Pg.99)

75)

383. The bandwidth of a multimode system is a function of all of the below except: a. Chromatic dispersion b. Modal dispersion c. Spectral width d. Length

C. Spectral width(Chapter 1: Pg.99)

76)

384. Chromatic dispersion occurs when the wider range of wavelengths in each pulse travels at a narrower range of individual speeds. True or False

False(Chapter 1: Pg.99)

77)

385. The amount of chromatic dispersion that occurs depends entirely on the center wavelength of the link. True or False

False(Chapter 1: Pg.99)

78)

386. Most glass optical fibers have minimal chromatic dispersion characteristics near ____________ nm. a. 850 nm b. 1300 nm c. 1550 nm

B. 1300 nm(Chapter 1: Pg.99)

79)

387. The modes following the longest paths arrive at the end of the optical fiber before modes following the shorter paths. True or False

False(Chapter 1: Pg.99)

80)

388. A pulse of light, consisting of hundreds of modes in a multimode optical fiber, widens in time as it travels through the optical fiber. True or False

True(Chapter 1: Pg.99)

81)

389. The bandwidth value as stated by the supplier only represents the effect of modal dispersion because the spectral width of a typical laser source is so small it makes chromatic dispersion insignificant. True or False

True(Chapter 1: Pg.99)

82)

390. As bandwidth reported by the optical fiber and cable supplier is the result of a measurement made with an LD source, this measurement is not really applied to LED system designs. True or False

True(Chapter 1: Pg.100)

83)

391. Multimode optical fiber is best suited for premises applications where links are less than all of the following except: a. 1000m (3281 ft) for data rates of 125 Mb/s or less b. 2000m (6560 ft) for data rates of 155 Mb/s or less c. 550m (1804 ft) for data rates of 1 Gb/s or less d. 300m (984 ft) for data rates of 10 Gb/s or less

A. 1000m (3281 ft) for data rates of 125 Mb/s or less(Chapter 1: Pg.102)

84)

392. The use of multimode optical fibers higher NA allows the use of all of the following except: a. LEDs b. VCSELs c. SW laser d. All the above

D. All the above(Chapter 1: Pg.102)

85)

393. Singlemode optical fiber is best suited for all of the following except: a. Bandwidth requirements exceeding multimode's capability b. Distances exceeding multimode's capability c. Spectral widths exceeding multimode's capability d. When the application requires singlemode

C. Spectral widths exceeding multimode's capability(Chapter 1: Pg.103)

86)

394. Even though the cost of multimode optical fiber cable is more expensive than singlemode, the installed system is less expensive. True or False

True(Chapter 1: Pg.103)

87)

395. One of the characteristics of 50/125 μm multimode optical fiber is the low attenuation at _______ nm and _______ nm wavelength regions. a. 650 nm and 1250 nm b. 850 nm and 1300 nm c. 1300 nm and 1500 nm

B. 850 nm and 1300 nm(Chapter 1: Pg.105)

88)

396. The 50/125 μm multimode optical fiber has mechanical compatibility with the 62.5/125 μm multimode and singlemode optical fiber connector parts because of the common diameters. True or False

True(Chapter 1: Pg.105)

89)

397. One of the characteristics of the 62.5/125 μm multimode optical fiber is that the attenuation is slightly higher than the 50/125 μm optical fiber. True or False

True(Chapter 1: Pg.105)

90)

398. Optical fibers do not transmit all wavelengths of light with the same efficiency. True or False

True(Chapter 1: Pg.106)

91)

399. The attenuation of light signals is much higher for visible light in the 400 nm to 700 nm region than for light in the near infrared region of wavelengths of ______ nm to ______ nm. a. 925 nm to 1550 nm b. 850 nm to 1300 nm c. 700 nm to 1600 nm

C. 700 nm to 1600 nm(Chapter 1: Pg.106)

92)

400. Wavelengths that are most suitable for optical communications are called _____________, the most common of which are found near 850 nm, 1300 nm and 1550 nm. a. Windows b. Regions c. Portals

A. Windows(Chapter 1: Pg.106)

93)

401. A typical upgradability characteristic of the dual window multimode optical fiber for data telecommunications installations is that a fiber installed to meet ethernet in the first window can also support an upgrade to a FDDI, ATM and Fast Ethernet system operating in the second window. True or False

True(Chapter 1: Pg.106)

94)

402. Singlemode optical fiber is dissimilar to multimode optical fiber in that the performance characteristics differ by orders of magnitude from those of multimode optical fibers. True or False

False (Chapter 1: Pg.107)

95)

403. A typical distance characteristic of singlemode optical fiber is that it can be used in unrepeated spans in excess of _____ km (_____ mi) with state of the art equipment. a. 40 km (25 mi) b. 60 km (37 mi) c. 80 km (50 mi)

C. 80 km (50 mi)(Chapter 1: Pg.107)

96)

404. A typical operating wavelength of singlemode optical fiber is _____ nm and _____ nm. a. 850 nm and 1300 nm b. 1310 nm and 1550 nm c. 1500 nm and 1800 nm

B. 1310 nm and 1550 nm(Chapter 1: Pg.107)

97)

405. Singlemode optical fiber cable with a maximum attenuation value of 0.5 dB/km at 1310 nm and 1550 nm would be generally considered for: a. Outside cable b. Inside cable c. Both

A. Outside cable(Chapter 1: Pg.107)

98)

406. All of the following are primary factors to consider in optical fiber selection and system design, except: a. Maximum supportable distance b. Application requirements c. Operating wavelength d. Maximum channel attenuation

C. Operating wavelength(Chapter 1: Pg.108)

99)

407. Which of the following is based on bandwidth, transmitter and receiver specifications, propagation delay, jitter and numerous other factors as established by the application standards? a. Maximum supportable distance b. Application requirements c. Maximum channel attenuation

A. Maximum supportable distance(Chapter 1: Pg.108)

100)

408. Which of the following is established by the difference between the minimum transmitter output power coupled into the optical fiber and the receiver sensitivity, less any power penalties established? a. Maximum supportable distance b. Application requirements c. Maximum channel attenuation

C. Maximum channel attenuation (Chapter 1: Pg.108)

101)

409. The following is the correct equation to use to determine the maximum length for a particular system design:Maximum=(Max. channel attenuation - [#of connector pairs x 0.75dB] - [#of splices x 0.3dB]length Cable attenuation coefficient True or False

True(Chapter 1: Pg.109)

102)

410. The maximum cable attenuation coefficient for single mode outside plant cable at both 1310 nm and 1550 nm is: a. 3.5 dB/km b. 1.5 dB/km c. 0.5 dB/km

C. 0.5 dB/km(Chapter 1: Pg.109)

103)

411. It is critical to ensure the installed link meets requirements of a generic cabling system, independent of a specific application or electronic product. True or False

True(Chapter 1: Pg.110)

104)

412. The overall system should be verified whenever new components are installed whether it is an optical fiber cabling system for active components that have already been chosen or an active component system that is retrofitted to a previously installed optical fiber cabling. True or False

True(Chapter 1: Pg.110)

105)

413. On short or basic systems, performance requirements have often already been considered by the manufacturer and translated into system specifications for all of the following except: a. Optical cable lengths b. Number of splices and connectors c. Optical cable performance d. More complex systems

D. More complex systems(Chapter 1: Pg.110)

106)

414. Which of the following are the two key parameters in optical fiber cabling performance that must be verified for compatibility with the proposed electronics? a. Bandwidth and active components b. Attenuation and bandwidth c. Distance and attenuation

B. Attenuation and bandwidth(Chapter 1: Pg.111)

107)

415. The theory and methodology used to verify appropriate optical fiber performance are the same for both singlemode and multimode optical fibers at any wavelength. True or False

True(Chapter 1: Pg.111)

108)

416. For telecommunications networks that have more than one optical fiber link, selecting a specific optical fiber grade for each individual link is generally recommended. True or False

False(Chapter 1: Pg.112)

109)

417. The bandwidth for an optical fiber cannot be tested or validated in the field. True or False

True(Chapter 1: Pg.112)

110)

418. For laser enhanced 50/125 μm or OM3 optical fiber, the bandwidth performance for each glass element of the end-to-end optical fiber, including all of the following, except ______________ should always be of the same specification. a. Channel b. Cords c. Aperture d. Cable e. Pigtails

C. Aperture(Chapter 1: Pg.112)

111)

419. Which of the following illuminates a smaller number of modes in the optical fiber? a. VCSELs b. LEDs c. SW

A. VCSELs(Chapter 1: Pg.112)

112)

420. Optical fibers suitable for medium distance delivery of high-speed applications have two bandwidths in the ______ nm window, one for an LED source overfill launch, and the other for the VCSEL restricted modal launch. a. 850 nm b. 1300 nm c. 1550 nm

A. 850 nm(Chapter 1: Pg.112)

113)

421. The maximum permissible end-to-end system attenuation in a given link is determined by all of the following except: a. Average transmitter power b. Receiver sensitivity c. Link loss budget

C. Link loss budget(Chapter 1: Pg.113)

114)

422. When calculating optical fiber performance the passive cable system attenuation loss should be calculated utilizing all of the following except: a. Optical fiber loss b. Connector loss c. Splice loss d. Component losses e. All of the above

E. All of the above(Chapter 1: Pg.113)

115)

423. When verifying optical fiber performance, subtract the passive cable system attenuation from the link loss budget, if the result is a negative number the system will not operate. True or False

True (Chapter 1: Pg.113)

116)

424. When calculating the link loss budget, you must calculate the system gain and power penalties. Which of the following would be the "system gain"? a. Difference between the transmitter average power and the receiver sensitivity b. Difference between the system gain and the link loss budget c. Difference between the operating margin and the receiver power penalty

A. Difference between the transmitter average power and the receiver sensitivity(Chapter 1: Pg.115)

117)

425. When calculating the power penalties, add the loss values for all of the following except: a. Repair margin b. Receiver power penalty c. Operating margin d. Transmitter power penalty

D. Transmitter power penalty(Chapter 1: Pg.116)

118)

426. Which of the following loss values would account for variations in the transmitter center wavelength? a. Repair margin b. Receiver power penalty c. Operating margin

C. Operating margin(Chapter 1: Pg.116)

119)

427. Which of the following losses would not be used to calculate the passive cable system attenuation? a. Optical fiber loss b. Power loss c. Connector loss d. Splice loss e. Other component loss

B. Power loss(Chapter 1: Pg.117)

120)

428. When working with existing cable plant, passive cable system attenuation can be measured directly. True or False

True(Chapter 1: Pg.117)

121)

429. To calculate optical fiber loss values multiply the length of the proposed link by the normalized cable attenuation for the optical fiber at the operating system wavelength. Temperature does not affect the loss of the optical fiber cable. True or False

False(Chapter 1: Pg.117)

122)

430. When planning for connector losses, selecting the lowest loss connector may be important to stay within the loss budget. True or False

True (Chapter 1: Pg.117)

123)

431. Loss variations due to temperature changes can sometimes be as high as _____ dB/km. a. 7 dB/km b. 5 dB/km c. 2 dB/km

C. 2 dB/km(Chapter 1: Pg.118)

124)

432. Add an additional margin in dB/km to the normalized optical fiber attenuation if the cable's specifications are for room temperature only, or based on an average of several optical fibers. True or False

True(Chapter 1: Pg.118)

125)

433. When designing links with five or more connector pairs, use the _________ value. a. Typical b. Maximum c. Minimum

A. Typical(Chapter 1: Pg.118)

126)

434. When designing links with 0 to 4 connector pairs, use the _________ value. a. Typical b. Maximum c. Minimum

B. Maximum(Chapter 1: Pg.118)

127)

435. Which of the following is the maximum connection loss recommended for optical fiber? a. 0.25 dB b. 0.50 dB c. 0.75 dB

C. 0.75 dB(Chapter 1: Pg.118)

128)

436. Which of the following is the maximum splice loss recommended for optical fiber? a. 0.1 dB b. 0.2 dB c. 0.3 dB

C. 0.3 dB(Chapter 1: Pg.118)

129)

437. When splicing using mechanical means rather than fusion, what is the average in decibels for singlemode? a. 0.3 dB b. 0.05 dB c. 0.10 dB

C. 0.10 dB(Chapter 1: Pg.118)

130)

438. When verifying performance, if the passive cable system attenuation is more than the link loss budget, the system has enough power to operate over the passive portion of the link. True or False

False(Chapter 1: Pg.119)

131)

439. If the result of verifying performance is below zero, and the system has not yet been installed, it may be necessary to add active components with greater system gains. True or False

True(Chapter 1: Pg.119)

132)

440. After verifying that the electronics have enough power to operate, compare the link attenuation with the receiver's dynamic range to ensure that there is ____________ in the link. a. Not too little loss b. Not too much loss

A. Not too little loss(Chapter 1: Pg.119)

133)

441. When determining minimum system loss, if the result is less than zero, no further checking is necessary. True or False

True(Chapter 1: Pg.120)

134)

442. If the minimum system loss is greater than zero, the resulting number represents the minimum loss that must be introduced into the link between the transmitter and receiver to maintain the specified ____________. a. Optical fiber loss b. Bit error rate c. Connector loss

B. Bit error rate(Chapter 1: Pg.120)

135)

443. Attenuators are devices that can be inserted into optical fiber transmission systems to introduce additional loss. Of the two types, fixed and variable, which can be tuned to a given link? a. Fixed b. Variable

B. Variable(Chapter 1: Pg.120)

136)

444. Determine whether the minimum loss criteria are met by measuring the attenuation of each link prior to installation. True or False

False(Chapter 1: Pg.120)

137)

445. Deviations from the original equipment manufacturers recommendations may be justified in the following circumstances, except: a. Fiber selection is made during design process, and before selection of active components b. Systems design for potential upgrades for which the active elements are not yet available c. Characteristics of the application and active equipment are justified by lengths and data rates. d. Existing installed optical fibers are used whether or not they are the recommended type for that particular end equipment

C. Characteristics of the application and active equipment are justified by lengths and data rates.(Chapter 1: Pg.121)

138)

446. Which of the following is the standard for North America when using synchronous optical networks? a. Synchronous digital hierarchy (SDH) b. Synchronous optical network (SONET) c. Synchronous transport signal (STS)

B. Synchronous optical network (SONET)(Chapter 1: Pg.122)

139)

447. The synchronous standards above organize transmission into _____-byte frames that include bits related to signal routing and destination as well as the data being transported. a. 810 b. 764 c. 672

A. 810(Chapter 1: Pg.122)

140)

448. The term synchronous means that all network nodes derive their timing signals from: a. A single master clock b. Different master clocks c. A designated master clock

A. A single master clock (Chapter 1: Pg.122)

141)

449. Unlike T and E multiplex formats, which of the following allows single channels to be extracted from the signal at any of the data rates, making it far more flexible and cost effective? a. STS b. SONET c. SDH

C. SDH(Chapter 1: Pg.122)

142)

450. An advantage of _____________ is that the line-side transmission format and alarm format are identical between all vendors, allowing for greater equipment choices. a. STS b. SONET c. SDH

C. SDH(Chapter 1: Pg.122)

143)

451. Which of the following concepts are based around the ability that any signal from a lower order multiplex stage can be inserted directly into a higher order signal? a. STS b. SONET c. SDH

C. SDH(Chapter 1: Pg.122)

144)

452. Prior to the optical transmitter receiving the electrical signal, there may be some conditioning or multiplexing of the electrical signal for use on the optical network. True or False

True(Chapter 1: Pg.123)

145)

453. For synchronous transmissions such as the following, the individual channels are often multiplexed prior to being sent to an optical receiver. Which of the following should not be in this group? a. SONET b. DSX c. STS

C. STS(Chapter 1: Pg.123)

146)

454. Which of the following is used as an alternative means of multiplexing signals onto an optical fiber system? a. Wavelength division multiplexing b. Digital-signal cross-connect c. Synchronous digital hierarchy

A. Wavelength division multiplexing(Chapter 1: Pg.124)

147)

455. Most commonly used in long haul, high bandwidth data transmissions, which of the following is also used to enable a single optical fiber to both transmit and receive? a. WDM b. DSX c. SDH

A. WDM(Chapter 1: Pg.124)

148)

456. All of the following are levels of multiplexing used in North America except: a. DS0 d. DS2 b. DS1 e. DS3 c. DS1C f. DS2C

F. DS2C(Chapter 1: Pg.127)

149)

457. The lowest level of digital carrier, DS0, contains _____ kb/s of information in PCM systems. a. 32 b. 64 c. 96

B. 64(Chapter 1: Pg.127)

150)

458. Which of the following is the first level of time division multiplexing? a. DS0 b. DS1 c. DS3 d. DS1C

B. DS1(Chapter 1: Pg.127)