There are four types of infrared networks:
line-of-sight
scatter infrared
reflective
broadband optical telepoint
infrared A type of light beam used in wireless networks to transmit the data between devices.
Narrowband radio is similar to broadcasting from a radio station. The broadcast range is 3,000 meters (9,842 feet), and does not require line-of-sight focusing. However, because the signal is high frequency, it is subject to attenuation from steel and load-bearing walls.
narrowband radio A high-frequency transmission similar to broadcasting from a radio station. The user tunes both the transmitter and the receiver to a certain frequency.
Spread-spectrum radio broadcasts signals over a range of frequencies. This helps it avoid narrowband communication problems. The available frequencies are divided into channels, known as hops. spread-spectrum radio A transmission technology that broadcasts signals over a range of frequencies, thus providing security for the transmission.
hop One portion of a transmission’s journey between two points.
Microwave systems can be used for the following:
satellite-to-ground links
between two buildings
across large, flat, and open areas, such as bodies of water or deserts
microwave Part of the electromagnetic spectrum, and a form of radiation that can be used for short- and long-distance communications systems. A microwave system can be used to transmit data from building to building.