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A.7. If the power of the signal at a distance of 4 km is 18.24 mW. for a cable with -0.1 dB/km, what is the power of the signal at the beginning of the cable? A.8. We measure the performance of a telephone line (4 kHz of bandwidth). When the signal is 10 V, the noise is 5 mV. What is the maximum data rate supported by this telephone line? A.9. We need to send 256 kbps over a noiseless channel with a bandwidth of 16 kHz. How many signal levels do we need?

A.7. If the power of the signal at a distance of 4 km is 18.24 mW. for a cable with -0.1 dB/km, what is the power of the signal at the beginning of the cable? A.8. We measure the performance of a telephone line (4 kHz of bandwidth). When the signal is 10 V, the noise is 5 mV. What is the maximum data rate supported by this telephone line? A.9. We need to send 256 kbps over a noiseless channel with a bandwidth of 16 kHz. How many signal levels do we need?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A.7. If the power of the signal at a distance of 4 km is 18.24 mW for a cable with -0.1 dB/km, what is the power of the signal at the beginning of the cable? A.8. We measure the performance of a telephone line (4 kHz of bandwidth). When the signal is 10 V, the noise is 5 mV. What is the maximum data rate supported by this telephone line? A.9. We need to send 256 kbps over a noiseless channel with a bandwidth of 16 kHz. How many signal levels do we need? A.10.What is the total delay (latency) for a frame of size 10 million bits that is being sent on a link with 20 routers each having a queuing time of 3 ps and a processing time of 1 us. The length of the link is 2000 km. The speed of light inside the link is 2×10° m/s. The link has a bandwidth of 5 Mbps. Which component of the total delay is dominant? Which one is negligible?
Transcribed Image Text:A.7. If the power of the signal at a distance of 4 km is 18.24 mW for a cable with -0.1 dB/km, what is the power of the signal at the beginning of the cable? A.8. We measure the performance of a telephone line (4 kHz of bandwidth). When the signal is 10 V, the noise is 5 mV. What is the maximum data rate supported by this telephone line? A.9. We need to send 256 kbps over a noiseless channel with a bandwidth of 16 kHz. How many signal levels do we need? A.10.What is the total delay (latency) for a frame of size 10 million bits that is being sent on a link with 20 routers each having a queuing time of 3 ps and a processing time of 1 us. The length of the link is 2000 km. The speed of light inside the link is 2×10° m/s. The link has a bandwidth of 5 Mbps. Which component of the total delay is dominant? Which one is negligible?
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