CCTV CCTV Power and Cabling Infrastructure

Question 1

What does PoE stand for in the context of IP CCTV systems?

Accepted Answer

Power over Ethernet

Answer

PoE (Power over Ethernet) allows electrical power to be transmitted along with data over standard Ethernet cabling, eliminating the need for separate power supplies at each camera.

Question 2

Which PoE standard provides up to 30W of power per port to connected devices?

Accepted Answer

IEEE 802.3at (PoE+)

Answer

IEEE 802.3at (PoE+) provides up to 30W of power per port, compared to the 15.4W limit of the original 802.3af standard.

Question 3

What type of cable is most commonly used for analog CCTV camera installations?

Accepted Answer

RG-59 coaxial cable

Answer

RG-59 coaxial cable is the industry standard for analog CCTV video signal transmission, providing shielding against electromagnetic interference.

Question 4

What is the maximum recommended cable run length for an analog CCTV camera using RG-59 coax without amplification?

Accepted Answer

300 meters

Answer

RG-59 coaxial cable is typically recommended for runs up to 300 meters (approximately 1,000 feet) before signal degradation requires a video amplifier.

Question 5

What is the primary purpose of a UPS (Uninterruptible Power Supply) in a CCTV system?

Accepted Answer

To maintain system operation during power outages

Answer

A UPS provides battery backup power to keep the CCTV system operational during electrical outages, ensuring continuous surveillance coverage.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV CCTV Power and Cabling Infrastructure