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# s7 - Compen/EE 362 Asst 7 Solution Fall 2010 Problem 1 Text...

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Compen/EE 362 Asst. 7 Solution Fall 2010 Problem 1. Text 4.21. Minimum frame size is to ensure collision is unambiguous . Consider building a CSCM/CD network running ot 1 Gbps over a 1 km cable with no repeaters. Sthe signal speed I the cable is 200,000 km/sec. Solution. 2 ô = 2*1/200000 = 10 sec. At 10 -5 9 bits/second , there would be 10,000 bits in time 2 ô . Thus the minimum size is 10,000 bits Problem 2. Text 4.25 The 1000Base-SX specification states that the clock shall run at 1250 MHz, even though gigabit Ethernet is only supposed to deliver 1 Gbps. Is this higher speed to provide for an extra margin of safety? If not, what is going on here? Solution. The 8 bit in 10 scheme is being used, where 8 bits are sent with 10 binary pulses, allowing to use mostly patterns with about an equal number of 1's and zeroes, to help with synchronization.

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Problem 3. Text 4.38 One consequence of using a spanning tree to forward frames in an extended LAN is that some bridges may not participate at all in forwarding frames.
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s7 - Compen/EE 362 Asst 7 Solution Fall 2010 Problem 1 Text...

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