Unformatted text preview: Time/cycle = TC = TT + RTT = 4 + 50 = 54 msec. Data/cycle = L = 4,000 bits (since 1-bit ARQ) Effective data rate = L/TC = 4,000/.054 = 74 kbps 2. For SR-ARQ, the efficiency is k/(1+2a), where k = send window size and 2a = normalized round trip time = RTT/TT = 12.5. For maximum data rate, k >= 1+2a = 1 + 12.5 = 13.5, so k >= 14. The number of bits needed to express k by itself if log2(14) = 4 bits, but in order to avoid confusing the receiver when the sequence number wrap around, there have to be at least 2k sequence numbers. Hence, sequence numbers must have at least 5 bits....
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- Spring '09
- Round-trip delay time, Transmission Control Protocol, Fibonacci number, maximum data rate, data rate, effective data rate