CCTB Test 2 Review

Question 1

what are the three most common types of CCTV power sources?

Answer 1

POE, 24v AC, 12v DC

Question 2

What is the importance of uniformly lighting a scene?

Answer 2

uniform picture quality

Question 3

Why is video compression necessary?

Answer 3

consumes more storage space, bandwidth, reduces upload/download time

Question 4

Define the four network categories that make up Quality of Service (QoS).

Answer 4

Bandwidth, latency, jitter, and traffic loss

Question 5

Why is it necessary to have the power supply for an outdoor PTZ located near it?

Answer 5

Power consumption; long runs = high power drops

Question 6

How does an IP/POE camera differ from a non IP/POE camera?

Answer 6

How they connect; BNC 2-wire, transmission distance and power all over with one cable, mini-chip

Question 7

What are some of the issues with power that affect a CCTV system and what can you do to help reduce them? Issues:

Answer 7

Burn out, black out, faulty power supplies/cables. You can correct by installing a UPS

Question 8

Define point-to-point wireless transmission

Answer 8

RF signal transmitted via line of sight point to point. Single camera to single monitor. Simple system.

Question 9

What are the three most common mounting options for a TRZ camera? Describe how each mount can affect the field of view.

Answer 9

Pandant - Wall mount 180°
Dome - Corner mount 270°
Pole - Pole mount 360°

Question 10

What reference is used for the standardization of the CCTV industry?

Answer 10

NTSC = none

Question 11

What does the term “scaleable pan” mean?

Answer 11

it won’t give you motion sickness - slows the pan rate when zoomed in.

Question 12

What are the recommended maximum distances for the following communication protocols?
RS-232
RS-422
RS-485
AD Manchester 18awg and 22awg

Answer 12

RS-232 - 50'
RS-422 - 4000'
RS-485 - 4000'
AD Manchester 
   18awg - 5000'
   22awg - 3200'

Question 13

What is a Gimbal mount and where are they used?

Answer 13

It’s a camera mount for a helicopter (non-stable platform)

Question 14

What is used to fill an explosion-proof housing?

Answer 14

Nitrogen 15psi

Question 15

Describe how DVMD (Digital Video Motion Detector) works.

Answer 15

It compares sequential images from video and if enough of the pixels have changed between frames, the camera software determines something moved and will send an alert

Question 16

Why is PTZ preset a useful tool for the security officer/operator?

Answer 16

Remote eyes/fast monitoring of activities in preset locations

Question 17

Describe the difference between conventional radio transmission and MIMO

Answer 17

MIMO uses at least two antenna - 2 in/2 out

Conventional is 1 in/1 out

Question 18

What are the two basic components of WiFi networks?

Answer 18

Wifi Radios Access points/gates. two basic modes of operation: infrastructure and ad hoc mode. In ad hoc mode, mobile units transmit directly peer-to-peer. In infrastructure mode, mobile units communicate through an access point that serves as a bridge to other networks

Question 19

Why is video compression not required for fiber-optic transmission?

Answer 19

Fiber has a very large bandwidth.

Question 20

What are the different types of communication media used for control of PTZ cameras?

Answer 20

wireless, VTP, coax, network, STP