1. Draw the waveform diagram that results when your initials (such as " EDE", my initials) are sent in ASCII across an RS-232 connection (will have to look up what ASCII values are). 2. Suppose you sent 46K bytes across a short RS-232 connection that operated at 19,200 bits/sec. How long would the transmission take? (hint: don't forget overhead bits.) 3. Consider a transmission system that provides 4000Hz of bandwidth and uses 16 different values to encode the information. For an ideal system with no noise, what is the maximum data rate possible? If the system has 28dB signal to noise ratio, what is the maximum data rate possible? 4. Imagine you are going to install several robotic arc welders that are bolted to a machine shop floor. These robots are to be networked to a central controller. What networking media would be appropriate to use? (note: arc welders can generate a lot of electrical noise.) 5. Consider a geosynchronous satellite system orbiting 36,000km above the earth with a 100Mbps data channel. How long does it take to send 4096 bytes of data from one earth station to another via the satellite? If we increase the transmission rate to 1.0Gbps, how long will it take to send 4096 bytes? 6. What is the difference between Asynchronous Time Division Multiplexing and Synchronous Time Division Multiplexing? When would it be advantageous to use Asynchronous TDM and when would it be advantageous to use Synchronous TDM? 7. A communication system transmits information by sending one of 8 different voltage levels down a wire every millisecond. What is the baud rate of the system? How many bits per second are being transmitted? 8. Write a paragraph that describes what computer systems will be like in the year 2023. Describe how people will use computers at that time. 9. The wave form diagram below shows the transmission of 8 bits using amplitude modulation where a high amplitude represents a 0 bit and a low amplitude represents a 1 bit. Each bit is transmitted in half of a wavelength. Give the value of the 8 bits being transmitted. EMBED Excel.Chart. 5\s 10. Define a modulation scheme that combines at least two modulation techniques (amplitude, frequency and phase shift). Draw the wave diagram using your modulation scheme to send the RS-232 asynchronous characters " NC
