220-801 · Question #699
Which of the following communication standards requires line-of-site with no obstacles in order to operate properly?
The correct answer is B. IR. IR (Infrared) communication transmits data using infrared light waves, which behave similarly to visible light - they cannot pass through solid objects and are blocked by anything that interrupts the beam between transmitter and receiver. This is why TV remote controls must be…
Question
Which of the following communication standards requires line-of-site with no obstacles in order to operate properly?
Options
- ABluetooth
- BIR
- CRF
- DWiFi
How the community answered
(27 responses)- A4% (1)
- B93% (25)
- C4% (1)
Explanation
IR (Infrared) communication transmits data using infrared light waves, which behave similarly to visible light - they cannot pass through solid objects and are blocked by anything that interrupts the beam between transmitter and receiver. This is why TV remote controls must be pointed directly at the TV. Bluetooth uses radio frequency (RF) signals in the 2.4 GHz band that can penetrate walls and obstacles. WiFi also uses RF signals (2.4 GHz or 5 GHz) that pass through walls, though signal strength is reduced. RF in general refers to radio frequency communication, which by its nature can propagate around and through many obstacles. Only IR strictly requires an unobstructed line-of-sight path.
Topics
Community Discussion
No community discussion yet for this question.