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# hw3 - CS/ECE 438 Communication Networks for Computers...

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CS/ECE 438: Communication Networks for Computers Spring 2010 Problem Set 3 Due: start of class, Wednesday, February 24 th . Direct Link Networks (II) Assigned reading: Peterson and Davie: Chapter 2.5 – 2.9. All problems carry equal weight. Please show all your work. 1. Multiple Access Nodes A and B are attached via a 200 m cable. Signal propagation speed is 2 x 10 8 m/sec, and the transmission rate is 40 Mbps. There is a single repeater between A and B, inserting a 10-bit delay. A has a frame of 175 bytes (including all headers and preambles) to send to B at t=0. a. What is the one-way propagation delay between A and B? b. Find the time when A’s packet is delivered at B. In addition to A’s frame, B also has a frame of 175 bytes to send to A. CSMA/CD with backoff intervals of multiples of 512 bits is used. When a collision occurs, A chooses K=0 and B chooses K=1 in the exponential backoff protocol. Ignore the jam signal and assume frame is sent immediately on an idle line. When will B’s frame be delivered at A in the following two instances? c. B is ready to send at t=1μs. Is the line busy? Is a collision detected? When will B’s frame arrive at A? d. B is ready to send at t=50 μs. Is the line busy? Is a collision detected? When will B’s frame arrive at A? 2.

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hw3 - CS/ECE 438 Communication Networks for Computers...

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