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Homework4 - (MACA protocol instead of CSMA/CD Explain why...

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Homework Assignment 4 ECE 155A - Winter 2009 Due Friday, February 6 1. a. Twelve signals each requiring 4000 Hz are multiplexed onto a single channel using Fre- quency Division Multiplexing (FDM). If each guard band is 400 Hz wide, what is the minimum bandwidth required for the multiplexed channel? b. The following character strings are transmitted over a channel that uses Time Division Mul- tiplexing (TDM), one character at a time. Show the stream of characters that are transmitted over the multiplexed channel. COLORADO DELAWARE ILLINOIS VIRGINIA 2. Consider the p-persistent Carrier Sense Multiple Access (CSMA) family of protocols, where 0 < p 1 . a. Why do the CSMA protocols perform generally better than the Aloha protocols? b. If p is very small, why is p-persistent CSMA generally better than 1-persistent CSMA? 3. a. Wireless LANs use protocols such as the Multiple Access with Collision Avoidance
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Unformatted text preview: (MACA) protocol instead of CSMA/CD. Explain why they do so. b. Suppose that six stations, A through F, communicate using the MACA protocol. Is it possible that two transmissions take place simultaneously? Explain your answer. 4. Some people say that the maximum size of an Ethernet frame is 1518 bytes, and others say that the maximum size of an Ethernet frame is 1500 bytes. Explain this discrepancy. Consider the destination address, source address, type/length, and checksum fields. 5. Battery life is currently a problem for mobile wireless devices. Discuss how the following technologies address the issue of power management in order to extend battery life. Please confine your discussion to one page and put it in your own words. a. WiFi (802.11) b. Bluetooth (802.15.1) (also see Wibree) c. ZigBee (802.15.4)...
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