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Low Voltage Year 2 > Test 3 - all sets > Flashcards

Test 3 - all sets Flashcards

1
Q

What is the purpose of the camera lens

A

reflect light and refocus it into the camera sensor

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2
Q

power over ethernet is ______ volts DC

A

48 VDC

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3
Q

The purpose of a network is to

A

share data

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4
Q

what communication protocol is used by most computer networks

A

TCP/IP

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5
Q

what at the two memory types network cameras use to store images locally

A

built in or via memory card

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6
Q

NIC

A

network interface card

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7
Q

What is the most common type of BNC connector

A

compression

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8
Q

What makes a camera a “network Camera”?

A

it has an ethernet connection and a NIC

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9
Q

how is an IP address constructed

A

4 sets or numbers separated by decimal points

a network manager determines IP address

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10
Q

What is a SAN

A

a whole network set up solely to store data

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11
Q

what do you do if the existing network does not have sufficient bandwidth to support the addition of network video

A

install a parallel network

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12
Q

the term bandwidth is used to describe what

A

amount of information a network can transmit

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13
Q

what are the distance limitations for passive baluns

A

under 1000 feet

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14
Q

what is the most common voltage for full body cameras

A

24 VAC

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15
Q

What are advantages of using fiber optic cable

A

smaller and lighter
immune to lightning, RFI, EMI
can be in same cable tray as High voltage
no ground loop issues - electrically isolatedmost secure

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16
Q

What is the purpose of surge protection

A

Provide supplemental protection to CCTV equipment

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17
Q

what is the benefit for powering cameras via POE

A

one cable

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18
Q

EMI

A

electromagnetic interferance

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19
Q

what type of additional storage would you recommend to a customer that insists on a very large storage requirement with expansion capabilities in the future

A

SAN - Storage area network

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20
Q

What type of camera is more sensitive in low light condition

A

Black and white - more light is required to produce an accurate color image

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21
Q

the connection from a network device to a network jack is done using a _______

A

patch cable

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22
Q

how do day/night cameras work

A

switch to blk/white when less than favorable light conditions occur

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23
Q

what is the advantage of using a tinted dome

A

disguise the direction a camera is pointing

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24
Q

BLC

A

Back Light Compensation - dim light behind target increase light of target

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25
Q

what is the transmission speed of 100 base T

A

100 MBPS

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26
Q

POE

A

power over ethernet

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27
Q

how are devices protected to prevent unauthorized access

A

a password and User ID

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28
Q

List some common sources of EMI

A

Florescent lights
motors
antennas
cable

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29
Q

How do you eliminate lighting bloom

A

reposition camera or add more light in a different direction to even out lighting

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30
Q

what protocol is used for transferring data between computers on a network

A

TCP/IP

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31
Q

the five factors that determine the amount of recording time you will get out of your DVR/NVR are

A 
Image record rate
picture size
image quality
scene activity
storage space
32
Q

TCP/IP

A

transmission control protocol/internet protocol

33
Q

what is the purpose of camera housing/domes

A

protect cameras from: tampering, the environment, and damage

34
Q

How many splices are allowed in a run of coaxial video surveillance cabling
what is industry standard

A

5 max

industry standard is two

35
Q

RAID

A

redundant array of independent disks

36
Q

How does a NVR receive its images

A

through a network connection

it can be a ethernet network or internet

37
Q

List three alternate methods for video transmission

A

twisted (STP, UTP)
fiber
wireless

38
Q

NVR

A

network video recorder

39
Q

what affects can be expected if the network video equipment consumes too much of the available network bandwidth

A

slowing of network speed and crashes

40
Q

What are two main methods for controlling PTZ cameras

A

digital and hardwire

keyboard and joystick

41
Q

another name for network transmitter is a

A

video server

42
Q

list the three common sixes and distance limitations for coax cable

A

RG-59: 500 FT
RG-6: 750 FT
RG-11: 1,500 FT

43
Q

What is the process for viewing network video on a computer

A

type the IP address into a web browser

44
Q

what are firewalls designed to do

A

protect a network

45
Q

What connector is industry standard for cctv Coax

A

BNC - Bayonet Neill–Concelman

46
Q

SAN (acronym meaning)

A

storage area network

47
Q

how are dynamic and static ip addresses different

A

dynamic IP address are assigned at random unlike static IP addresses which cant be changed

48
Q

why would you connect a RAID array to a HVR

A

to increase the amount of video storage

49
Q

PTZ

A

Pan-Tilt-Zoom Camera

50
Q

the RAID array connects directly to the ______ to increase the amount of video storage

A

NVR/HVR

51
Q

periphereals

A

devices that are shared on a network eg printers fax machines

52
Q

is all network based video equipment compatible

A

NO

53
Q

node

A

fax machine, printers……..

54
Q

what are 5 common camera types

A 
Full body cam
Bullet Cam
Dome Cam
Board Cam
Covert Cam
55
Q

what is the unit of measure for light sensitivity

A

lux or foot candle

56
Q

what is the purpose of the subnet mask

A

used to divide the network

57
Q

How does network video differ from standard CCTV

A

standard video systems are hardwired to a image store/management system while network video systems connect to the network hub and can be viewed by multiple devices

58
Q

what piece of equipment is the physical connection between the node and the network

A

NIC - Network interface card

59
Q

who assigns the IP address to a device

A

network manager

60
Q

what is the difference between a hub and a router

A

the hub is a switching/ control point where as the router allows a network to access the internet

61
Q

how are inputs and outputs on a camera used

A

allow network transmitters to send signals to other locations over the network
allow transmitter to receive control signals from remote locations
can control auxiliary devices (EG motion detection, speakers)

62
Q

how is internet IP address different from IP address

A

Internet IP address are generated by the service provider and always stay the same while dynamic IP address change

63
Q

AGC

A

automatic gain control - increase image sensitivity in low light situations

64
Q

why is it important to limit the amount of bandwidth you are using on the customers network

A

to prevent slowdowns and network crashes

65
Q

what is a disadvantage of using a tinted dome

A

less light is let in

66
Q

when selecting a transformer, be sure that it has sufficient ___________ to power all devices

A

wattage: current and voltage

67
Q

what is the difference between general coverage and detail coverage

A

general covers a wide area while detail has a smaller coverage but more detail

68
Q

what information is contained it the MAC address

A

hardware manufacture
model number
devices individual ID number

69
Q

1 candle foot equals _____ lux

A

10 lux

70
Q

What are 4 types of BNC connectors

A

twist on
two piece crimp
three piece crimp
compression

71
Q

what is the main difference between a standard DVR and a hybrid DVR

A

a DVR only has the ability to record a digital signal while a HDVR has the ability to record digital and analog signals

72
Q

when is it safe to look down a fiber optic cable

A

when it is powered down or not connected to a lazer

73
Q

list two type of firewall programs that mask the internal IP addressees of devices on a network when those devices are connected to the internet

A

DHCP - dynamic host configuration protocol

NAT - network address translation

74
Q

ALC

A

automatic lens control - allows the camera to control auto iris lens

75
Q

Can devices share an IP address

A

no, it would confuse the system

Low Voltage Year 2 (6 decks)

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