RD Glossary
F
- FDMA (frequency division multiple access)
- A process that divides a relatively wide frequency band into smaller sub-bands, where each user transmits voice and data over their assigned sub-band.
- FHSS
- See frequency hopping spread spectrum
- firewall
- A device that keeps users connecting to a specific part of the network from accessing important resources. Because of their vulnerability, access points of wireless LANs are often placed outside the firewall.
- frequency
- The number of times per second that a signal repeats itself. Often measured in Hertz (Hz), which is the number of cycles occurring each second. Frequencies of wireless LANs, for example, are within the 2.4GHz and 5GHz bands.
- frequency hopping spread spectrum
- A type of spread spectrum where the transceiver hops from one frequency to another according to a known hopping pattern in order to spread the signal over a wider portion of the frequency band. Older 802.11 wireless LANs utilize frequency hopping.
- FSK (frequency shift-keying)
- A modulation process that makes slight changes to the frequency of the carrier signal in order to represent information in a way that’s suitable for propagation through the air.
RD Glossary by Run Digital
