Test 3 - all sets Flashcards
What is the purpose of the camera lens
reflect light and refocus it into the camera sensor
power over ethernet is ______ volts DC
48 VDC
The purpose of a network is to
share data
what communication protocol is used by most computer networks
TCP/IP
what at the two memory types network cameras use to store images locally
built in or via memory card
NIC
network interface card
What is the most common type of BNC connector
compression
What makes a camera a “network Camera”?
it has an ethernet connection and a NIC
how is an IP address constructed
4 sets or numbers separated by decimal points
a network manager determines IP address
What is a SAN
a whole network set up solely to store data
what do you do if the existing network does not have sufficient bandwidth to support the addition of network video
install a parallel network
the term bandwidth is used to describe what
amount of information a network can transmit
what are the distance limitations for passive baluns
under 1000 feet
what is the most common voltage for full body cameras
24 VAC
What are advantages of using fiber optic cable
smaller and lighter
immune to lightning, RFI, EMI
can be in same cable tray as High voltage
no ground loop issues - electrically isolatedmost secure
What is the purpose of surge protection
Provide supplemental protection to CCTV equipment
what is the benefit for powering cameras via POE
one cable
EMI
electromagnetic interferance
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
SAN - Storage area network
What type of camera is more sensitive in low light condition
Black and white - more light is required to produce an accurate color image
the connection from a network device to a network jack is done using a _______
patch cable
how do day/night cameras work
switch to blk/white when less than favorable light conditions occur
what is the advantage of using a tinted dome
disguise the direction a camera is pointing
BLC
Back Light Compensation - dim light behind target increase light of target
what is the transmission speed of 100 base T
100 MBPS
POE
power over ethernet
how are devices protected to prevent unauthorized access
a password and User ID
List some common sources of EMI
Florescent lights
motors
antennas
cable
How do you eliminate lighting bloom
reposition camera or add more light in a different direction to even out lighting
what protocol is used for transferring data between computers on a network
TCP/IP
the five factors that determine the amount of recording time you will get out of your DVR/NVR are
Image record rate picture size image quality scene activity storage space
TCP/IP
transmission control protocol/internet protocol
what is the purpose of camera housing/domes
protect cameras from: tampering, the environment, and damage
How many splices are allowed in a run of coaxial video surveillance cabling
what is industry standard
5 max
industry standard is two
RAID
redundant array of independent disks
How does a NVR receive its images
through a network connection
it can be a ethernet network or internet
List three alternate methods for video transmission
twisted (STP, UTP)
fiber
wireless
NVR
network video recorder
what affects can be expected if the network video equipment consumes too much of the available network bandwidth
slowing of network speed and crashes
What are two main methods for controlling PTZ cameras
digital and hardwire
keyboard and joystick
another name for network transmitter is a
video server
list the three common sixes and distance limitations for coax cable
RG-59: 500 FT
RG-6: 750 FT
RG-11: 1,500 FT
What is the process for viewing network video on a computer
type the IP address into a web browser
what are firewalls designed to do
protect a network
What connector is industry standard for cctv Coax
BNC - Bayonet Neill–Concelman
SAN (acronym meaning)
storage area network
how are dynamic and static ip addresses different
dynamic IP address are assigned at random unlike static IP addresses which cant be changed
why would you connect a RAID array to a HVR
to increase the amount of video storage
PTZ
Pan-Tilt-Zoom Camera
the RAID array connects directly to the ______ to increase the amount of video storage
NVR/HVR
periphereals
devices that are shared on a network eg printers fax machines
is all network based video equipment compatible
NO
node
fax machine, printers……..
what are 5 common camera types
Full body cam Bullet Cam Dome Cam Board Cam Covert Cam
what is the unit of measure for light sensitivity
lux or foot candle
what is the purpose of the subnet mask
used to divide the network
How does network video differ from standard CCTV
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
what piece of equipment is the physical connection between the node and the network
NIC - Network interface card
who assigns the IP address to a device
network manager
what is the difference between a hub and a router
the hub is a switching/ control point where as the router allows a network to access the internet
how are inputs and outputs on a camera used
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)
how is internet IP address different from IP address
Internet IP address are generated by the service provider and always stay the same while dynamic IP address change
AGC
automatic gain control - increase image sensitivity in low light situations
why is it important to limit the amount of bandwidth you are using on the customers network
to prevent slowdowns and network crashes
what is a disadvantage of using a tinted dome
less light is let in
when selecting a transformer, be sure that it has sufficient ___________ to power all devices
wattage: current and voltage
what is the difference between general coverage and detail coverage
general covers a wide area while detail has a smaller coverage but more detail
what information is contained it the MAC address
hardware manufacture
model number
devices individual ID number
1 candle foot equals _____ lux
10 lux
What are 4 types of BNC connectors
twist on
two piece crimp
three piece crimp
compression
what is the main difference between a standard DVR and a hybrid DVR
a DVR only has the ability to record a digital signal while a HDVR has the ability to record digital and analog signals
when is it safe to look down a fiber optic cable
when it is powered down or not connected to a lazer
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
DHCP - dynamic host configuration protocol
NAT - network address translation
ALC
automatic lens control - allows the camera to control auto iris lens
Can devices share an IP address
no, it would confuse the system
