K2 Stuctured cabling and K8 Flashcards Preview

Year 4 Electrical > K2 Stuctured cabling and K8 > Flashcards

Flashcards in K2 Stuctured cabling and K8 Deck (37)
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1
Q

point of demarcation

A

the point at which the service provider terminates

2
Q

List three network topologies

A

Bus
Star
Ring

3
Q

UTP

A

Unshielded twisted pair

4
Q

STP

A

Shielded twisted-pair

5
Q

ScTP

A

Screened twisted-pair

6
Q

Two types of Coaxial cable

A

RG-6 limited to 152 m

RG-59 limited to 61 m

7
Q

What is the max length of horizontal cable?

A

90m

8
Q

What is the max length of patch cords or jumpers?

A

10m

9
Q

What is the difference between a code and a standard?

A

Code governs install practices and Standards are guidelines to install practices

10
Q

Three types of LAN cables

A

twisted pair, coaxial, fiber-optic

11
Q

Why is UTP cable twisted?

A

to shield against electromagnetic interference between wires. the twisting cancels each other out

12
Q

what is the pulling tension of Cat 5 horizontal distribution cable?

A

25 lbs

13
Q

Describe Wire Mapping

A

this test confirms whether or not there is proper connection of all four pairs of UTP cabling

14
Q

Describe Attenuation test

A

is a measure of the signal loss from one end of the link to the other. Is expressed in dB: the lower the number the better

15
Q

Describe Crosstalk

A

the unplanned transfer of information from one cct to another cct

16
Q

what does FEXT mean

A

Far-end crosstalk

17
Q

what does NEXT mean

A

near-end crosstalk

18
Q

what does ANEXT

A

alien crosstalk

19
Q

Return Loss

A

a ratio in dB of the outgoing signal’s power compared to the power of the signal reflected back

20
Q

ACR attenuation to crosstalk ratio

A

measure of how much more signal than noise exists in the link

21
Q

Decibel

A

the bel is a measure of analogue signal strength

22
Q

Noise

A

an unwanted electrical activity that interferes with the desired signal transmission

23
Q

basic link

A

permanent portion of the cable from the patch panel to the work-area outlet

24
Q

two possible causes of attenuation

A

high temp, too long cable

25
Q

List three actions that can reduce noise

A

maintain cable separation
no split pairs
maintain cable twisting

26
Q

Four components of a fibre-optic installation

A

transmitter
fibre-optic cable
optical connectors
receiver

27
Q

VIsible light is from

A

380 to 760 nm

28
Q

Advantages of fibre-optic

A
Wide bandwidth
Low loss
Electro-magnetic immunity
Light weight
Small size
More safe
29
Q

List the parts of a fibre-optic cable

A
core
cladding
primary coating
buffer
strength members
outer jacket
30
Q

CEC list what three types of fibre-optic cables?

A

nonconductive
conductive
hybrid

31
Q

What type of light is used in fibre-optic cable

A

infared light

32
Q

As the Hz of a waveform increases its wavelength

A

decreases

33
Q

List five purposes of security systems

A
Deterrence
Prevention
Detection
Response
Apprehension
34
Q

onion skin principle

A

provides layers of protection

35
Q

List the three layers of protection

A

Perimeter
Space
Spot

36
Q

The three main cct in a basic alarm system

A

Detection
Control
Output

37
Q

What does a PIR detector detect

A

changes in the levels of infrared energy