... Standards 2 1a) Dial-Up 2 1b) Cable Modem 3 2) Switching 4 3) Routers 6 4) WAN Standards 7 Data Communications Assessment 2 Wide Area Networks & Standards 1a) Dial-Up A wide area network connects LANs that are typically separated by great distances. The best-known example of a WAN is the Internet itself. A ... In many homes today people have Internet access. Dial-up modems are able to give the average person with a home computer access to the largest library in the world, something that was mainly for companies or the rich. Now as it becomes common technology, it has also become commonpl...

• Word Count: 2573
• Approx Pages: 10
• Has Bibliography
• Grade Level: High School

... output signal from 555 timer. Pulse-width modulation uses a rectangular pulse wave whose pulse width is modulated resulting in the variation of the average value of the waveform. Pulse-width modulation is regularly used in the field of digital communication and as well as in robotics. Its duty ... other considerations, such as parasitic ringing and electromagnetic interference (EMI) emission, may impose an upper limit on the turn-on and turn-off speed in practical situations, the resulting finite rise and fall time can be ignored in the analysis of PWM signals and processes in most cases...

• Word Count: 3144
• Approx Pages: 13
• Has Bibliography
• Grade Level: High School

... windmill; vertical-axis turbine looks like an eggbeater. Wind turbines usually have rotors or blades, an electrical generator, speed control system, and a tower. There are different sizes of wind turbines and rotor size that can range from a football field to just five feet wide and the height can range from a 20-story building to 30 feet tall. A large turbine can generate ... collectors, solar distillation, and solar electricity. Focusing collector has three components: heliostats, parabolic collector, and receiver. "Heliostats are moveable mirrors used to track the sun for the greatest...

• Word Count: 3357
• Approx Pages: 13
• Grade Level: High School