C. There are several types of Multiplexing. 1. What distinguishes Division 2. Wh

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C. There are several types of Multiplexing. 1. What distinguishes Division 2. What Time Division Multiplexing 3. What distinguishes Wave Division Multiplexing 4. If you were buying a multiplexer, why would you choose either a FDM or TDM? D. Layer Two: controls access and handles errors. 1. Describe three access control methodologies. 2. Describe the techniques in Layer Prevent errors. 3. Describe the methods in Layer 2 that Control errors. 4. Describe three Layer 2 Error Detection methods E. Draw how a series of FOUR separate messages would be successfully sent from one computer to another using ARQ if I. the first message was transmitted without error 2. the second message was initially transmitted with an error 3. the third message was initially lost 4. and the ACK for the fourth message was initially lost. Use Visio or PowerPoint format F. You have downloaded a number of Word and PowerPoint files from D2L. Assuming that the next file you will download is 3.4Mb, how long would it take using the following circuits? Also assume that control characters and management overhead adds a total of an extra 10% to the message. 1. Dial up modem at 33.6 Kbps 2. Cable modem at 384 Kbps 3. T-1 line at 1.5 Mbps Show your work using a spreadsheet and graph the results using a bar graph format. G. Create a table for the OSI protocol stack listing: 1. Layer Number 2. Layer Name 3. Layer Functions in detail 4. Layer Sample Protocol(s) 5. Layer Name for its "chunk of data" if applicable

Explanation / Answer

C.

1. Frequency Division Multiplexing: In Frequency Division Multiplexing, the signals are separated in frequency domain. Signal from each source is adjusted to different frequencies, so that the frequency spectrum after modulation will not overlap.

2. Time Division Multiplexing: In Time Division Multiplexing the signals are separated in time domain. Signals are allowed to pass through common line one at a time for fixed time. Suppose, if there are five signals, then each signal is transmitted for a period t. When all signals are transmitted for period t, then the first one is sent again.

3. Wavelength Division Multiplexing: This is a method of merging multiple signals on laser beams at various infrared wavelengths for transmission along fiber optic media. Each laser is modulated by an independent set of signals. WDM is similar to frequency-division multiplexing, but instead using radio frequencies, WDM uses the IR portion of the electromagnetic spectrum.

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