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Florida Institute of Technology Department of Electrical and Computer Engineering ECE 4561 Computer Communications Spring 2015 HOMEWORK 2 Submit in Class, Monday, February 23, 2015. Show all calculations and full detail descriptions 1. Suppose you have the following 2 bytes: 01011100 and 01100101. What is the 1s complement of the sum of these 2 bytes? How do you tell (show calculation) if there is an error or not supposed the operation is performed at the receiver? 2. How long does it take a packet of length 1,000 bytes to be transmitted into a link of distance 2,500 km, propagation speed 2.5 · 108 m/s, and transmission rate 2 Mbps? Does this delay depend on packet length? Does this delay depend on transmission rate? 3. Fill the table below Elementary Data Link Protocols Brief description / imperfection / source of problem Mechanism added to resolve the problems Utopian Simplex Protocol Stop-and-Wait Protocol One-bit Sliding Window Go-back-N Selective Repeat 4. Compute the Fourier coefficients for the function g(t) = t (0 ≤ t ≤ 1). 5. find Shannon capacity for a channel of 30Mhz bandwidth with S/N of 8.45dB 6. List 7 transmission media

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