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41 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is a LAN? |
Local area network- where the cable radiates from the suppliers connections (Telus, Shaw, etc.) through a series of points and equipment, ending at the work-area devices (computers) |
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What are 3 categories of telecommunications? |
Voice, data, video |
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What is an example of data? |
LAN, MAN, WAN, PC’s |
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What name is given to the vertical or horizontal cables that run from the equipment room to the telecommunications room? |
Back bone cables |
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What name is given to cables that run from the telecommunications closet to the work area? |
Horizontal cables |
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What is the purpose of the telecommunications closet? |
Interconnect horizontal cables and backbone cables |
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What is the maximum length of a horizontal cable? |
90m or 295ft |
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What is the maximum length of patch cord cables? |
10m |
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What CEC section refers to communication cables? |
Section 60 |
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Why is UTP cable twisted? |
To eliminate interfering crosstalk between pairs |
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What is the difference between shielded and screened? |
Shielded: has a shield on each pair Screened: one overall shield around all conductors |
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What are 3 uses of Coaxial cable? |
Computer networks, cat V, video systems |
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What is the difference between RG-6 and RG-59 coax? What is RG-6 used for? |
The distance limitation: RG-59: 61m (200ft) RG-6: 152m (500ft) Home security, cat V cables, video |
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What are the 3 LAN topologies And which is most common? |
Star: central hub with all other network devices connected to the one point. Bus: one length of cable connect all network devices Ring: connects all network devices in a circle |
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What is the main standard in the telecommunications industry? |
ANSI/EIA/TIA-568-C |
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What is EMI? |
Electrical interference induced onto adjacent cables |
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What are 3 types of twisted-pair cables? |
-unshielded twisted-pair (UTP) -screened twisted-pair (ScTP) -shielded twisted-pair (STP) |
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What is the difference between UTP and ScTP cables? |
UTP protects against EMI, ScTP protects against EMI and and high frequency |
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What is the difference between cat 5, 5e and 6 cables |
Higher category can handle higher frequencies, cat 5e is higher performance than cat 5. |
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What is the purpose of codes and standards? |
Protection of life, health and property |
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What two things must always be done when using conduit to run cables? |
Ream the conduit, always instal a pull string for future |
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What are 5 cable management systems? |
Conduit, cable trays, underfloor systems, ceiling pathway, plywood back boards |
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What are underfloor duct systems? |
Pathways for telecommunication cables that are embedded in concrete |
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What is an attenuation test? |
Measurement of signal loss from one end of the link to the other |
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What is cross talk? |
Unplanned transfer of info from 1 circuit to another |
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What are 3 main layers of a basic optical fibre construction |
Core: glass or plastic Cladding: slightly more opaque than core Buffer (coating): for mechanical protection |
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What are 3 advantages of fibre optic? |
-wide band width -low loss -electromagnetic immunity -light weight -small size
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What are 5 layers of a fibre optic cable? |
Core, cladding, primary coating, buffer, strength members, outer jacket |
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For fire ratings, what is the description of FT1, FT4 and FT6? |
Ft1: buildings of combustible construction FT4: buildings of either combustible or not combustible construction FT6: same as FT 4 plus spaces that may be used as a plenum |
CEC 2-130 app b |
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What is the term “attenuation”? |
Power loss in a signal as it travels over a distance |
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What important safety precaution must be considered when working with fibre optics? |
Infrared can cause permanent eye damage |
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What are 3 categories of fibre optic cables? |
Non conductive, conductive and hybrid |
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What are 4 main parts of a fibre optic system? What does each one do? |
transmitter: converts electrical signal into light signal fibre optic cable: transmits light between transmitter and receiver optical connectors: termination point for fibre optic cable receiver: converts light signal into electrical signal |
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What is the recommended distance to keep cables away from motors and fluorescent lights? |
Fluorescent lights- 12” Motors, transformers- 40” |
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What are 2 main advantages of fibre optic? |
-wide band width -low loss -electromagnetic immunity -light weight -small size
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Name three underfloor systems for distributing cable |
-Underfloor duct -cellular floor -raised access floor |
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Which layer is the “primary coating” of the fibre optic cable above? |
B (3rd layer from core) |
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If we straighten out a kinked cable, will it regain normal function? |
No, because when it kinks it can cause small breaks in the insulation or damage the conductor which will cause major interference |
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What is the pulling tension of cat 5 horizontal distribution cable? |
25 ft/lb or 110 N•M |
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What is the best way to protect cables against EMI sources interference? |
Space the conductors away from the source of EMI |
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What is the standard pin out connection in Canada? |
T568A 12345678 AABCCBDD |
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