CCTV Power and Cabling Infrastructure Flashcards
6 cards from real CCTV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCTV Power and Cabling Infrastructure flashcards as text
What does PoE stand for in the context of IP CCTV systems?
Answer: Power over Ethernet
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.
Which PoE standard provides up to 30W of power per port to connected devices?
Answer: IEEE 802.3at (PoE+)
IEEE 802.3at (PoE+) provides up to 30W of power per port, compared to the 15.4W limit of the original 802.3af standard.
What type of cable is most commonly used for analog CCTV camera installations?
Answer: RG-59 coaxial cable
RG-59 coaxial cable is the industry standard for analog CCTV video signal transmission, providing shielding against electromagnetic interference.
What is the maximum recommended cable run length for an analog CCTV camera using RG-59 coax without amplification?
Answer: 300 meters
RG-59 coaxial cable is typically recommended for runs up to 300 meters (approximately 1,000 feet) before signal degradation requires a video amplifier.
What is the primary purpose of a UPS (Uninterruptible Power Supply) in a CCTV system?
Answer: To maintain system operation during power outages
A UPS provides battery backup power to keep the CCTV system operational during electrical outages, ensuring continuous surveillance coverage.
Which wiring standard is used for RS-485 communication in PTZ CCTV camera control?
Answer: Two-wire twisted pair (differential signaling)
RS-485 uses differential signaling over two wires (A and B), which provides noise immunity and allows control signals to travel up to 1,200 meters.