2931995
Description
Flashcards by Lillian Mehler, updated more than 1 year ago
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Created by Lillian Mehler
almost 9 years ago
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| Question | Answer |
| Network: | meant for communication via computers or cell phones (each device/ user is called a node). Goal: to have all nodes connect and communicate |
| Wide Area Network (WANs) | largest, fiber optic, i.e. internet and telephone. |
| Metropolitan Area Networks (MANs) | - relatively smaller areas, fiber optic, I.E. local cable TV, large companies, governments. |
| Local Area Networks (LANs) | small group of computers (<1000), twisted cable for short distance communication, can be wireless, I.E. small businesses and homes, Wi-Fi (Wireless Fidelity, 300 ft.) |
| Personal Area Networks (PANs) | short-range, wireless (30 ft.), I.E. Bluetooth headset (which uses frequency hopping) |
| Home Area Networks (HANs) | inside the home to control energy usage |
| Storage Area Networks (SANs) | connect large data storage devices, I.E. HDDs to computers |
| Simplex- one-way communication | A transmitter at one end and a receiver at the other, I.E. radio broadcasting, paging, remote control |
| Half Duplex- | two-way communication, Two transmitters and two receivers, but only one party can transmit at a time, I.E. fax machines, police service, computer modems |
| Full Duplex- | two-way communication. Two transmitters and two receivers. Both parties can transmit and receive information at the same time. I.E. cell phones |
| Radio Wave- | electromagnetic wave that travels at the speed of light186,282 miles per 1 second! |
| Radio Transmitter- | can generate an electromagnetic wave by applying an alternating (AC) voltage to an antenna |
| Electromagnetic Wave- | The higher the frequency, the shorter the wavelength and thus the smaller the antenna. |
| Amplitude Modulation (AM)- | voltage changes amplitude |
| Frequency Modulation (FM) | carrier amplitude: constant, frequency: changes. |
| Phase Modulation (PM) | a modulation pattern that encodes information as variations in the instantaneous phase of a carrier wave |
| Spread spectrum (SS)- | developed during World War II to prevent the enemy from interpreting radio transmissions |
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