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Data Communications and Networking

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COMP2330 Data Communications and Networking
Written Assignment 1

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1. Which of the OSI layers handles each of the following: (a) Dividing the transmitted bit stream into frames. (b) Determining which route through the subnet to use. (10 marks)


a) Data Link Layer

b) Network Layer

2. An image is 1024x768 pixels with 3 bytes/pixel. Assume the image is uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over a 1-Mbps cable modem? Over a 10-Mbps Ethernet? Over 100-Mbps Ethernet? (10 marks)


The size of the image is 1024 x 768 x 3 x 8 = 18874368 bits.

For a 56-kbps modem, it takes 18874368/56000 [pic] 337 seconds.

For a 1-Mbps cable modem, it takes 18864368/106 [pic] 18.9 seconds.

For a 10-Mbps Ethernet, it takes around 1.89 seconds.

For a 100-Mbps Ethernet, it takes around 0.19 seconds.

3. A digital signaling system is required to operate at 9600bps. (10 marks)

(a) If a signal element encodes a 4-bit word, what is the minimum required bandwidth of the channel if we assume a noise free system?

(b) Repeat part (a) for the case of 8-bit words.

Because we assume noise free, we can use Nyquist’s equation: C = 2B log2M. We have C = 9600 bps (a) log2M = 4, because a signal element encodes a 4-bit word. (So, actually M=16). Therefore, C = 9600 = 2B × 4, and we have B = 1200 Hz (b) 9600 = 2B × 8, and so B = 600 Hz

4. The following waveform belongs to a Manchester encoded binary data stream. Determine the beginning and end of bit periods (i.e., extract clock information) and give the data sequence. (10 marks)


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