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designer
Cards in this deck (83)
- 1Radiating cables, or ...................... coax, are sometimes used to enhance in-building wireless and are specially popular in traffic tunnlelsLeaky
page 22-94 - 2—
- 3CT3-DECT Systems facilities cell hand-off because the handset talks and listens only during .......................specific time slots.
page 22-93 - 4Name the four categories used within the USA to rate productsListed
Classified.
Recognized
Verified.
Page 1-51 - 5An electrical conductor is any substance that carries.................. from one point to anotherCurrent.
page 2-3 - 6What is the biggest advantage aluminum has over copper when used as an electrical conductorIt is much lighter
Page 2-4 - 7What do codes pertain to?Electrical codes
building codes
fire codes
and all other safety codes
page 1-2 - 8What institute accredits the TIA/EIA standards, which govern telecommunications cabling infrastructure?American National Standards Institute
(ANSI)
page 1-3 - 9The purpose of the standard is to ensure a minimal..................Level of performance
Page 1-4 - 10What is the name of the organization responsible for the Open System Interconnection Model?International Organization for Standardization (OSI)
page 1-16 - 11The purpose of codes, in general, is for the practical safeguarding of........ and........ from hazards, and to ensure the quality of construction.Person and Property.
Page 1-2 - 12T or F Codes are requirement for the performance of a given telecommunications systems?False
Standards, No codes, establish performance guidelines and criteria for telecommunications systems.
page 1-3 - 13What do standards quantify, compare, measure, or specify?Capacity, quantity, content, extent, value, and quality.
page 1-4 - 14How often is the Canadian electrical code (CEC), part 1 revised?Every 4 years.
page 1-21 - 15What does the CEC part 1, Section 2, Titled "General Rules" provide information on?Permits, marking of cables, and flame spread requirements for electrical wiring and cables.
page 1-21 - 16What type of cable's installation requirements is addressed in section 56 of CEC?Optical fiber cabling.
page 1-22 - 17What ANSI/TIA/EIA standard contains information regarding commercial building standards for telecommunications pathways and spacesANSI/TIA/EIA 569-B
page 1-25 - 18What subject is contained in FCC part 15?Radiated Emission Limits.
page 1-28 - 19What does Section 12 of the CEC, Titled Wiring Methods address?The requirements for installing cabling systems.
page 1-22 - 20Which ANSI/TIA/EIA standard is titled Commercial Building Telecommunications Cabling Standard, Part 1 General requirements?ANSI/TIA/EIA 568-B.1
- 21Which ANSI standard could a telecommunications distribution designer refer to for questions about commercial building grounding (earthing) and bonding requirements for telecommunications?ANSI J-STD 607-A
page 1-26 - 22What is the full name of the institute that publishes the National Electric Safety Code?Institute of Electrical and Electronics Engineers, inc (IEEE)
page 1-29 - 23What is the formal name of the IEEE committee that oversees the development of the IEEE 802 family of standards?IEEE 802 Local and Metropolitan Area network standards committee (LMSC)
page 1-30 - 24What document addresses the accessibility of telecommunications devices by disabled person?American with Disability Act (ADA) 1992
page 1-29 - 25Which IEEE working group has developed standards fro Token bus networks?IEEE working group 802.4
page 1-33 - 26Which IEEE working group has developed standards for broadband wireless metropolitan networks?IEEE working group 802.16
page 1-36 - 27what does CSMA/CD stand for?Carrier sense multiple access with collision detection
page 1 32 - 28which IEEE. working group has developed standards for wireless local area networks?IEEE working group 802.11
page 1 35 - 29what does the NESC (IEEE C2.2002) cover?Basic provisions for the safeguarding of persons from the hazard that arise during the installation operation or maintenance of outside plant (OSP) overhead and undergroung communications lines and electrical supply lines.
page 1 40 - 30What NFPA code is titled. National Electric Code?NFPA 70
page 1 43 - 31What NFPA code is titled recomended practice for the fire protection of telecomunications. facilities?NFPA 76.
page 1 43 - 32How often is the NEC revised?Every 3 years
page 1 43 - 33Which NEC article defines and identifies three classes and two divisions of hazardous locations?Article 500
page 1 45 - 34What NFPA code is titled National fire alarm code?NFPA 72
page 1 43 - 35What NFPA code is titled life safety code?NFPA 101.
page 1 43 - 36Which NEC article addresses grounding?Article 250
page 1 44 - 37What are three advantage of using solid conductors iver strandes conductors?Less costly.
Better transmision performance at high frecuencies.
Less complex termination systems.
page 2 4 - 38What is dielectric strenght?A measure of the maximun voltage that a conductor's insulation can withstand without breakdown.
page 2 9 - 39Name the most common electrical coductors that wire and cable are made ofCopper.
Copper covered steel
hugh strenght copper alloy.
Aluminum.
page 2 3 - 40Identify the problems found when using aluminun conductors.Galvanic corrosion.
heat related connections
Low conductivity.
Special connection techniques that are required for terminations.
page 2-4 - 41What wire sizing systems is genarally accepted as the North America standard?American Wire Gauge.
(AWG).
page 2-6 - 42Why does a smaller AWG number represent a larger diameter wire?Because fewer drawing steps are involved.
page 2-6. - 43What is another word used to describe a dialectric?Insulation.
page 2-7. - 44With respect to electrical characteristics describe the dielectric constantThe ratio of tha capacitance of an insulated conductor to the capacitance of the same coductor uninsulated in the air.
page 2-9 - 45Identify the main reason for twisying pair of conductors i balanced, twisted pair cables.To minimize crosstalk and noise by decreasi g capacitance unbalance and mutual iductance coupling between pairs.
page 2-10 - 46T or F A clockwise twist os used in the construction of balanced twisted-pair cables.False.
A counter clockwise twist is used.
page 2-10 - 47Nsme the two items that are incersely propotio al to the electrical performance of balanced twisted pair cables.Insulation's dielectric constant.
Dissipation factor.
page 2-7 - 48What is isulation resistence?The insulatuon ability to resist the flow os the curret through it.
page 2-9 - 49What is mutual inductance?A measure of the magnetic field coupling between two pairs if a differential current is applied on one pair and differential noise curret is measured on another pair close proximity.
page 2-10 - 50T or F In balanced twisted pair cable construction, tight twists tend to preserve their shape better than loger twists in a cable.True.
page 2-10 - 51Electromagnetic interference (EMI) is stray ............. ........... radianted from electronic equipment and electrinic systems (including cables)..Elextrical energy.
page 2-11 - 52Name the three reasons insertion loss increases with temperature.Conductor resistence.
Insulatuon dielectric constant.
Dissipatiin factor.
page 2-16 - 53What are xable shields made of?Foil.
Wire strands.
Braided metal.
page 2-16 - 54Describe cable shoeldingA shield of metallic covering or envelope enclosing an insulated conductor, an individual group of conductors within a core, or a cable core.
page 2-16 - 55T or F. hogh temp above 20 c. can increase insertion loss on a balanced twisted pair cable?True.
page 2-11 - 56Name the four functions of cable shields.Reduce radianted signal from the cable to acceptable level
Reduce the effects of electrical hazzards when properly grounded and bonded.
Minimize the efect of external EMI on the circuits.
Increase the capacitance per unit length of cable. - 57What factor is electromagnetic wave shielded egfectiveness dependent upon?Type and thickness.of the material used.
Number ans size of the openings in the shied.
page 2-16. - 58T or F. Grounding does not affect the performance of the cable shield.False.
If a shield is not properly grounded, its effectiveness is reduced.
page 2-19. - 59What unit indicates cycles per seconds.Hertz. Hz.
page 2-20 - 60Decibels are logarithmic factor. what does a us 3 dB. change rest in?Doubling the power.
page 2-23. - 61Decibels are a logarithmic factor. what does a minus 3 dB. change resumt in?Reduction of pawer by a half.
page 2-23. - 62How does loading improve voice transmissions?Comoensates for the capictance of a cable pair.
Reduce the capcitive current laoding through a range of audio frecuencies.
page 2-26. - 63Where are drain wires usually applied?Longitudinal, next to the metallic part of the shield for the entire length of the cable.
page 2-19 - 64What causes echoes?Discontinuites in the medium that carries the sound.
page 2-23 - 65Name the three components of a communications transmissions systems.Energy.
Medium.
Receiving device.
page 2-24 - 66Name the most common distances between loading points for D and H loadings.D 1.3 km. 4500 feet.
H 1.8 km. 6000 feet.
page 2-26 - 67Name the 2 interface options available for use with IP telephony.An IP phone. looks like phone but it is like computer.
APersonal computer with IP software mifrophone speakers or USB. handset.
page 2-28 - 68List the five steps involved in the conversion of the analog signal into digital signal.Sampling.
Quantizing.companding.
Pulse code modulation.PCM.
Time division multiexing TDM.
Line coding
page 2-31 - 69Regarding transmission principles define characteristic impedence.The input impedance of a uniform transmission line of infinite length.
page 2-44. - 70What is crosstlak?Signal inyerference between pairs,picking up u wanted signals from other pairs or conductors nearby cables.
page 2-45 - 71What is one drawback of digital transmission compared to analog transmission?The increased bandwidth require for digital transmission.
page 2-37 - 72What does insertion loss correspond to?The ratio of input power to the output power when load and source impedance are matched to the caracteristics of the cable.
page 2-44 - 73Define delay skew?The difference in propagation delay between any pairs within the same cable sheath
- 74How are transmission circuits classifed?Simplex.
Half duplex.
full duplex.
page 2-49 - 75T or F. There are currently three different types of ISND services availabe on north america.False.
there are 2. ISND.
Basic rate and Primary rate.
page 2-54 - 76What IEEE 802.3ah task force currently developing?Ethernet in the first mile EFM.
page 2-60 - 77What three nominal wavelengths do optical fiber transmiters, for glass optical fiber normally emit ligth at o near.?850 nm.
1300 nm.
1550 nm.
page 2-102 - 78What is the maximun number of carrier transission channels that can be used for a DSI digital signal?24.
page 2-53 - 79What is the data rate for circuits using STS-3/OC3 transmission?155.52 Mb/s
page 2-59 - 80What does an optical transitter contain?Ligth emitting diode LED
Short wavelength compat disk CD.
Vertical cavity surface emitting laser VCSEL.
laser diode LD.
page 2-101 - 81What is the center wavelength of an LED transmitter?800 to 900 nm.
1250 to 1350 nm.
page 2-106 - 82What is the characteristics wavelength of a short wavelength laser transmitter?780 nm.
page 2-107 - 83What should the deaigner consider to determine required system bandwidth?Curretn needs.
possible future needs.
page 2-113.
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- Flashcards on designer, created by Rodrigo Chacon on 26/10/2015.
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