4B/5B Digital Encoding Scheme

 

 

Provide a technical description of 4B/5B Digital Encoding Scheme. Contrast it with the Manchester scheme. Explain how and why it provides better data rates.
Create a ranked table (see below) based on transmission speed, comparing three types of twisted pair, coaxial cable, fiber-optic cable, microwave, and satellite. A total of seven media. Include distances and typical installation use cases.
Type of Media

Transmission Speed

Distances

Typical installation use cases

Using your favorite search engine, include an image or create a diagram comparing a low earth satellite deployment with a geosynchronous satellite deployment in a situation where you would need 24/7 coverage of the whole earth as your basic criteria. The image or diagram should include ground stations and appropriate locations. (Hint: all satellites (GEO and LEO) and ground stations need to be included and/or labeled).
Provide a comparison of the difference in expense (cost) of the two different solutions (Cite your source).
Include in the response the importance of satellites to wireless communication and connectivity.
Include a relevant reference.
Discuss the data communication features of USB standards and implementation. What are the pros and cons of using USB drives? In your opinion, what is a portable alternative to the USB drive?

Sample Solution

The bi-phase Manchester encoding can consume up approximately twice the bandwidth of the original signal (20 MHz). While this was of little concern in coaxial cable transmission, the limited bandwidth of necessitated a more efficient encoding method for 100 Mbps transmission using a 4b/5b and a MLT-3 line code. 4b/5b encoding is a type of “Block coding.” This processes groups of bits rather than outputting a signal for each individual bit (as in Manchester encoding). A group of 4 bits is encoded so that an extra 5th bit is added. Since the input data is taken 4-bits at a time, there are 2-4, or 16 different bit patterns. As a result, the 5-bit patterns can always have two `1`s in them even if the data is all `0`s a translation occurs to another of the bit patterns. This enable clock synchronizations required for reliable data transfer.

bachev came to power, he began to implement reforms in order to improve the Soviet economy. Despite these efforts, they ultimately led to the collapse of the Soviet Union. The desire for economic reform surfaced from the growing economic inequality within the Soviet Union. Wealth became focused within the elite, while the majority of Soviets were suffering; the standard of living in the Soviet Union was one third of the standard of living level in America and less than half of West Germany and France (Johnson & Raynes, 1984, page ii). Low standards of living generally guarantees unrest with populations because people are likely unsatisfied with their economic situation. The downfall of the Soviet Union is evidence of the fact that governments are unstable when their preferred system of economics is not capitalism.

 

 

Capitalism supports equality in nations, because capitalism supports equal opportunity vice versa. Capitalism is sustainable because it is often accompanied with socialist political policies. Equal opportunities give more people the means to support themselves. Though there may be economic inequality in capitalist states, there isn’t widespread poverty at the same level as in communist nations. This is because the people who are motivated enough to sustain themselves will find a way to achieve what they want.

Major financial support is provided under communist governments. Theoretically this is a beneficial policy, but realistically it isn’t as beneficial as it is intended to be. At least 20 percent of Soviets lived in poverty compared to 14 percent of Americans in 1988 (Fein, 1989). The average Soviet only has to dedicate 6 percent of their income to paying rent, whereas Americans dedicate 26 percent of their income to living expenses (Fein, 1989). The Soviets denounced the existence of poverty in their country up until Gorbachev’s leadership, and instead claimed that poverty was only brought on by capitalism. The large number of people who were experiencing economic hardships sought for change in the USSR. Despite Soviet officials claiming that the poverty was caused by laziness, many believe that poverty was brought on by the economic state of the USSR. T

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