Data Communications Essay

Differentiate between an analog and a digital electromagnetic signal. What are three important characteristics of a periodic signal. What is the relationship between the wavelength and frequency of a sine wave. Define fundamental frequency. What is the relationship between a signal’s spectrum and its bandwidth. What is attenuation? Define channel capacity. What key factors affect channel capacity? Problems: Figure 1 shows the frequency domain function for a single square pulse. The signal pulse could represent a digital 1 in a communications system. Note that an infinite number of higher frequencies of decreasing magnitudes is needed to represent the single pulse. What implication does that have for a real digital transmission system? Suppose that a digitised TV picture is to be transmitted from a source that uses a matrix of 480 x 500 picture elements (pixels), where each pixel can take on one of 32 intensity values. Assume that 30 pictures are sent per second. (This digital source is is roughly equivalent to broadcast TV standards that have been adopted.) Find the source rate R (bps) Assume that the TV picture is to be transmitted over a channel with 4.5Mhz bandwidth and a 35dB signal-to -noise ratio. Find the capacity of the channel (bps). Discuss how the parameters given in part (a.) could be modified to allow transmission of colour TV signals without increasing the required value for R. What is the channel capacity for a teleprinter channel with a 300Hz bandwidth and a signal-to-noise ratio of 3dB, where the noise is white thermal noise? A digital signalling system is required to operate at 9600bps. If a signal element encodes a 4-bit word, what is the minimum required bandwidth of the channel? Repeat part (a .) for the case of 8-bit words. Given the narrow (usable) audio bandwidth of a telephone transmission facility, a nominal SNR of 56dB (400,000), and a certain level of distortion, What is the theoretical maximum channel capacity (kbps) of traditional telephone lines? What can we say about the actual maximum channel capacity? Given a channel with an intended capacity of 20Mpbs, the bandwidth of the channel is 3MHz. Assuming white thermal noise, what signal-to-noise ratio is required to achieve this capacity? If an amplifier has a 30dB voltage gain, what voltage ratio does the gain represent? An amplifier has an output of 20W. What is the output in dBW? Answers: Short Questions With guided media, the electromagnetic waves are guided along an enclosed physical path whereas unguided media provide a means for transmitting electromagnetic waves but do not guide them. A continuous or analog signal is one in which the signal intensity varies in a smooth fashion over time while a discrete or digital signal is one in which the signal intensity maintains one of a finite number of constant levels for some period of time and then changes to another constant level. Amplitude, frequency, and phase are three important characteristics of a periodic signal. The relationship is ÃŽ »f = v, where ÃŽ » is the wavelength, f is the frequency, and v is the speed at which the signal is traveling. The fundamental frequency is the lowest frequency component in the Fourier representation of a periodic quantity. The spectrum of a signal is the frequencies it contains while the bandwidth of a signal is the width of the spectrum. Attenuation is the gradual weakening of a signal over dis tance. The rate at which data can be transmitted over a given communication path, or channel, under given conditions, is referred to as the channel capacity. Bandwidth, noise, and error rate.

Moral choice of Hamlet

Hamlet was the only son of the late King that was named too as Hamlet. His father was murdered when Hamlet was away from home. He had an uncle, a brother of his father, named Claudius and later married Hamlet’s mother named Gertrude. Since Hamlet’s father was murdered, it was Claudius who took over the palace and became a king. On the other, Hamlet had a girlfriend named Ophelia. Ophelia was dearly loved by Hamlet. But there were many obstacles and hindrances that tested their love as lovers. Ophelia’s father, Polonius, and brother, Laertes, had strongly disagreed with their affair. They even reprimanded Ophelia not to talk again with Hamlet due to the reason that it was not inappropriate for Hamlet and Ophelia to have a relationship because they both came from different world. Moreover, Hamlet was very depressed and sad when his father died. He really searched and did not stop in finding for the truth in order to have justice for his father’s death. Hamlet had an intuition that his uncle, King Claudius, was responsible for the death of his father but Hamlet did not have enough evidences to prove the said accusation. But since he was clever enough, Hamlet made a plan that surely helped him find out who was the master mind of the death of his father. Then he found out something from the plan he set. When he identified and discovered that it was King Claudius who was responsible for his father’s death, he started to set another plan on how to kill King Claudius as a revenge and retaliation to his uncle. This plan he set up made the people, especially his uncle and Ophelia, puzzled what made him like that and this plan was to act out as insane. Hamlet believed that this plan will be the best way to kill his uncle. Now, when Hamlet showed himself to Ophelia, the love of his life was very terrified and startled because she knew that Hamlet was going insane and she was afraid what Hamlet might do to her. Because of that, Ophelia was set by King Claudius and Polonius to be used in finding out on what were the causes and reasons why Hamlet was going crazy. They speculated that Hamlet was insane because he and Ophelia were not permitted to see each other. But when the time they’ve met, Hamlet continually acted out as insane and Ophelia was very sad and depress. So King Claudius and Polonius were very disturbed on what made Hamlet that way and the King assumed that there must be another reasons that made him insane. Furthermore, there was an incident that Hamlet and Ophelia went out to watch a dramaturgical performance and Hamlet acted again as insane because King Claudius was there and he thought it would be the time to verify and confirm Claudius’ contriteness in the killing of his father. That incident made Ophelia very humiliated. After that incident, Hamlet accidentally killed Ophelia’s father that result to Ophelia’s suicide by drowning herself in the riverbank. Hamlet’s morals: Hamlet’s heart was full of hatred and selfishness in such a way that due to his plan to revenge to his stepfather and an uncle at the same time, the lives of others were affected and destroyed. He only thinks for himself. It is not wrong to find out the truth but if you cause pain and hurts to other people in order to get your desired plan, then, that made it bad. Hamlet had good intentions in doing such plan because through that, he will be able to find justice for his father’s death. But the act itself in carrying such plan was morally wrong because he involved other people’s lives like Ophelia’s father that he killed because of his anger and that caused Ophelia’s depression and ended up killing her on life.

Summary chapter 29-history Term Paper Example | Topics and Well Written Essays - 1250 words

Summary chapter 29-history - Term Paper Example He continues Kenney’s foreign policy especially in Vietnam. The Warren Court expanded freedom of expression, separated church from state, and increased protection to the accused. In the Yates case, the court released the members of the Communists party who advocated the overthrow of the American government following their rhetoric that actions, not words, constitute a crime. In the 60’s court issued many orders on criminal justice decisions and declared a right to an attorney to all defendants. Warren Court’s decision to separate church from state angered many and it was considered to be doing a poor job but for minorities outside the mainstream, Court remained a valuable ally. Kennedy’s candidacy and Viva Kenney movement gave hope to the minorities, especially Hispanics and Latinos. Johnson soon became popular among the minorities by appointing several Mexican Americans to the administration but it by 1966 his popularity vanished. Most of the Mexican Americans still felt ignored especially in the West and Southwest. They started taking more direct actions. By the mid 60’s the Puerto Rican population had increased to about a million. They attempted to coordinate federal grants and find jobs while the younger ones were being organized by the militant lords in Chicago and New York. For most Mexican Americans the key issue was education, jobs and wages. Their children were still being barred from decent education and demanded better education opportunities for Hispanics along with special programs to meet their special needs such as bilingual education. Raul Ruiz organized Mexican student in Los Angeles in 1969 and encouraged them to demand thei r rights. Walkouts spread in California and Texas. In 1968, Title VII of the Elementary and Secondary Education Act was passed approving bilingual education. Cries for dignity, better work conditions and living wage were also heard. In 1962, Cesar Chavez created the

Discussion Board 1 Essay Example | Topics and Well Written Essays - 250 words - 1

Discussion Board 1 - Essay Example Worth noting, unethical behavior is different from unlawful in the sense the former entails that which is not acceptable as per the stipulated rules by a firm. Conversely, unlawful behavior has to do with what is legally forbidden. For instance, an employee who physically attacks another at the workplace is engaging in an unlawful act; starting romantic relationships in the office is unethical. Corporate Social responsibility (CSR) has elicited mixed views since Milton Friedman asserted the essence of every business. Milton’s statement that the primary objective of every business is to make profit is often viewed negatively with some contesting these assertions. To some, businesses have a responsibility to the society around it. However, the position taken here is that the statement by Milton is correct and is strongly agreed with. First, hardly any business is conducted without employees meaning that the society already benefits through employment. In addition, many companies require materials, many of which are sourced near their stations (Lee & Kotler, 2013). This greatly influences the communities around because the business offers a market place for different materials. There is more than a business does to the society than monetary assistance including invention. For instance, Microsoft has caused a global impact simply by inventing interesting computer-related products. As a result, people from around the world have used some of these products to change their lives positively. In this case, the society has not directly benefited in monetary from Microsoft, but their lives are transformed tremendously. Hence, CSR is not compulsory for businesses since it is not the primary objective. Besides, by undertaking different projects, businesses affect the society in various

Week 5 d1 Essay Example | Topics and Well Written Essays - 250 words - 1

Week 5 d1 - Essay Example Because of this, organizations can develop efficient and productive business process, which meets the expectations of the market. Management integration brings all operations under one roof or umbrella, which is the core in developing parameters for improvements as well as checking the progress (TechNet, 2014). Additionally, management integration helps in network management by event monitoring, security and reviewing performance (TechNet, 2014). It becomes easier to monitor the performances of an integrated management because all the departments are together. Similarly, it allows for automatic reporting that is vital to making the organization to progress (TechNet, 2014). Lastly, management integration assists in network management by offering support response as well as alert services that an organization may require at any given time (TechNet, 2014). It allows for timely delivery of information or critical data as may be needed at any given time to assist the organization is meeting the goals. For instance, Integration with IBM NetView network management system is essential in automatic reporting (TechNet, 2014). There are also other network management services, which offer different services required by the

Is Outsourcing Good for America Essay Example | Topics and Well Written Essays - 1250 words

Is Outsourcing Good for America - Essay Example As Konig & Koskela elaborates â€Å"Over the last years, as a result of the growing globalization, international outsourcing, which is defined as the acquisition of production parts from an independent foreign supplier, has become an important managerial tool in reorganizing a firm’s production process (22). Outsourcing as a managerial tool however is not a new or a radical business practice concept. Offshoring, a specific subset of outsourcing, involves the practice of moving noncore operations overseas, either by transferring jobs to a foreign subcontractor or building a facility where labor is cheap (Burkholder 2). It is only recent that outsourcing became pervasive as precipitated by the advances in information technology, integration of economy and the necessity for businesses to keep up with competition. As further elaborated by Burkholder, Private industry and the federal government have numerous reasons for outsourcing. Based on a survey by the General Services Admini stration in February 1998, â€Å"Outsourcing Information Technology,† the following are the primary reasons, in descending order of importance, for outsourcing information systems: Focus in-house resources on core functions. Allow personnel cost savings. Improve quality of information systems services. Increase flexibility (9). And this pervasiveness in resorting to outsourcing has changed the way business is done. Now, some early adopters are figuring out how to tap overseas workers for personal tasks. They're turning to a vast talent pool in India, China, Bangladesh and elsewhere for jobs ranging from landscape architecture to kitchen remodeling and math tutoring. They're also outsourcing some surprisingly small jobs, including getting a dress designed, creating address labels for wedding invitations or finding a good deal on a hotel room, for example (http://online.wsj.com). Given the scope and scale that outsourcing is being practiced today, it is no longer a surprise tha t this has caused anxiety among workers of host countries of a possible displacement from their jobs. Those workers' fears however have some grounding in fact. The prime motive of most corporate bean counters jumping on the offshoring bandwagon has been to take advantage of such "labor arbitrage" -- the huge wage gap between industrialized and developing nations. And without doubt, big layoffs often accompany big outsourcing deals (http://www.businessweek.com). Business as an entity is still profit driven and will always look for ways for it have a competitive edge against competitor to maintain profitability and increase the value for its shareholders. As always, it will always be motivated on cutting cost to maximize profitability. Such, outsourcing is just one of its strategy to keep up with competition and maintain its profitability in the market. For sure jobs will be in danger. With wages in developing countries like India and China which is only 10 to 20% compared to US salar y, the incentive for companies to outsource is just very hard to resist especially when there seems to be an endless supply of educated and underemployed workers (Hira 3) who can equally perform a US based job. The IT industry, which was once one of the highest paid jobs, is estimated by the experts of the University of California to be in danger of being outsourced. And nothing can

One product of a famous company Essay Example | Topics and Well Written Essays - 500 words

One product of a famous company - Essay Example Common supply factors affecting sales and profitability in the Mercedes Benz Company include efficient operations, presence across segments, accessibility to latest technologies, finance availability, wide dealer networks and price of the Mercedes Benz. Other supply factors include production factors, government taxes and policies. In order to move towards a sustainable and a profitable market structure, the Mercedes Benz Company must ensure that it increases its product affordability. The company must also ensure it implements a better advertising and marketing, financing options, and price of the product. Different elasticity concepts tend to influence Mercedes Benz pricing strategy. The concepts include availability of substitute products, responsiveness of quality in terms of the motor vehicle, time and importance of the motor vehicle in the consumers’ budget (Rhoads, 2014, 78). With its performance in the global markets, it is evident that the Mercedes Benz Company is utilizing its resources efficiently. The Mercedes Benz Company is currently performing well in the motor vehicle (Lamb, Hair, & Mcdaniel, 2010, 57). This aspect is reflected in the company’s revenues and performance index, which indicates that the company is among best performing companies in the motor vehicle industry. Performance and revenues demonstrate efficient use of resources in the organization. The macroeconomic environment plays a significant role in comprehending how the external forces affect a company (Altug & Chadha, 2003). Mercedes Benz being a high-end car is definitely affected by changes in economic growth as it determines the money in people hands. People will not have the money to buy the car in times of economic downtimes. Consequently when the economy is under turmoil, the success of the company is undermined because the car’s models are expensive hence people will not have the