have a lower cost than shielded twister pair cables.
B.
enable bitrates up to a maximum of 40 Gbit/s.
C.
can be used for long distances.
D.
are sensitive to electromagnetic interference.
Answer:
C
Explanation:
Fiber optic cables are ideal for long-distance data transmission due to their low signal attenuation and high bandwidth capabilities. Unlike copper cables, fiber optics can transmit data over several kilometers without significant loss of signal quality. They are also immune to electromagnetic interference, making them suitable for environments with high electrical noise. Axis technical references on networking confirm that fiber optic cables are preferred for long-distance and high-performance networking applications.
Question 46
What is the main purpose of the laser module in Axis PTZ cameras?
Options:
A.
Illuminating a dark scene
B.
Measuring object size
C.
Getting sharp focus
D.
Creating deterrence
Answer:
C
Explanation:
The main purpose of the laser module in Axis PTZ cameras is to achieve sharp focus. The laser technology enables precise focusing by accurately measuring the distance to objects in the camera's field of view. This results in clearer images, especially in dynamic and low-light environments, where traditional focusing methods might struggle.
[References: Axis Communications PTZ Camera Features, ]
Question 47
Which dome type might negatively affect the image quality?
Options:
A.
Hydrophilic clear dome
B.
Smoked dome
C.
Clear dome
D.
Glass dome
Answer:
B
Explanation:
A smoked dome might negatively affect the image quality. Smoked domes can reduce the amount of light reaching the camera sensor, leading to darker and less clear images. While they offer additional privacy and reduce the visibility of the camera’s direction, they can compromise the overall image clarity and brightness. Axis Communications' documentation on dome camera housings and their impact on image quality confirms this.
Question 48
How do PTZ cameras use lasers to improve focus?
Options:
A.
The laser makes an invisible target the PTZ locks on to
B.
The laser provides the target distance
C.
The laser provides the target reflectance
D.
The laser provides additional illumination for the scene
Answer:
B
Explanation:
PTZ cameras use lasers to measure the distance to the target, which allows for quick and accurate focusing. The laser range finder determines the precise distance between the camera and the subject, enabling the camera to adjust its focus optimally. This technology ensures that the camera can focus rapidly and accurately, even in challenging lighting conditions or when the target is moving. Axis Communications' technical specifications for PTZ cameras confirm that laser technology is employed to enhance focus performance by providing target distance information.
