Which of the following terms refers to very low powered and short-range radio connections?
A.
CDMA
B.
Infrared
C.
GSM
D.
Bluetooth
Explanation:
Bluetooth is a standard for very low powered and short-range radio connections. It is used to link
personal access devices (PDA), mobile
phones and laptops, and provides them with Internet access via hot spots. Bluetooth uses the 2.4
Ghz spectrum with a data rate of about 1
Mbps. As a radio technology, Bluetooth does not require line of sight like an infrared connection
requires. The maximum transmission range of
Bluetooth is around 10 meters. High-powered Bluetooth would extend the range to 100 meters.
Answer A is incorrect. CDMA stands for Code-Division Multiple Access. It is a digital cellular
technology that uses spread-spectrum
techniques.
Answer C is incorrect. GSM stands for Global System for Mobile Communications. It is the most
popular standard for mobile phones in
the world.
Answer B is incorrect. Infrared is not a type of radio communication.