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### hw2

Course: ECE 537, Fall 2009
School: Wisconsin
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Word Count: 304

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537 ECE - Spring 2007 Homework 2 Due: 2pm Mar 26, 2007 FIRM deadline since solutions will be posted. 1. Suppose we are using a Go-Back-N ARQ with a window size of 5. The line utilization is only 60% on a link that is 1500m long with a 10Mbps data rate. If there are no transmission errors on the line, what is the frame size? 2. A channel has a bit rate of 4 kbps and a propagation delay of 40 msec. For what range...

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537 ECE - Spring 2007 Homework 2 Due: 2pm Mar 26, 2007 FIRM deadline since solutions will be posted. 1. Suppose we are using a Go-Back-N ARQ with a window size of 5. The line utilization is only 60% on a link that is 1500m long with a 10Mbps data rate. If there are no transmission errors on the line, what is the frame size? 2. A channel has a bit rate of 4 kbps and a propagation delay of 40 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 50 percent? 3. Construct the Walsh orthogonal sequences of length 16. 4. Why is error control (ARQ) included in the MAC layer in IEEE 802.11 and not in IEEE 802.3? 5. Suppose that a group of 32 stations is serviced by a token-ring LAN. For the following cases calculate the time it takes to transfer a frame using the three token reinsertion strategies: (1) After completion of transmission (multi-token); (2) After return of token (single token); (3) After return of the (single frame frame). a. 1000 bit frame; 10 Mbps; 2.5-bit latency per adapter; 50m between each station. b. Same as part (a) except 100 Mbps and 8-bit latency per adapter (station). c. Same as part (a) except 1 km distance between each station. 6. Suppose that the ALOHA protocol is used to share a 56 kbps satellite channel. Suppose that frames are 1000 bits long. Find the maximum achievable throughput of the system in frames/second. If the propagation delay is 500ms, what is the maximum achievable throughput of CSMA-CD on a similar channel (assuming you could do CD)?...

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