The nyquist theorem is one of the deciding factor in data communication.

The nyquist theorem is one of the deciding factor in data communication. PART A Q1. The Nyquist theorem is one of the deciding factor in data communication. The fibre optics as well as the copper wires are communication mediums. Do you think the theorem is valid for the fiber optics or for the copper wires. Ans. Nyquist theorem is valid for both fibre optics and copper wires this is because the Niquist theorem is purely depend upon the mathematic function and has not any concern with the transmission media for communication. According to Henry Nyquist, a perfect channel has a finite transmission capacity. He derived an equation expressing the maximum data rate for a finite bandwidth noiseless channel. Nyquist said that if an arbitrary signal has been run through a low-pass filter of bandwidth B, the filtered signal can be completely reconstructed by making only 2Bsamples per second. Sampling the line faster than 2B times per second is pointless because the higher frequency components that such sampling could recover have already been filtered out. If the signal consists of L discrete levels, Nyquists theorem states: Maximum bit rate =2* Bandwidth log2 L. For noisy channel: Capacity = bandwidth * log2 (1+SNR), where SNR is signal to noise ratio. Q2. Noise affects all the signals which are there in air. There are some communicating modulation techniques. Noise affects which of the modulation technique the most. Ans. Noise is defined as the disturbance in the signal. When data is send over the network in the form of signal, due the various natural or unnatural circumstances produce disturbance in the signals which is called noise. The noise is various kinds such as thermal noise, crosstalk, and impulse noise. Noise affects all the signals but there are some modulation techniques which are used to reduce the noise. These techniques are: Amplitude modulation Frequency modulation Phase modulation The amplitude modulation is affected most by the noise this is because there is the change in only amplitude and the amplitude is affected easily by the noise. Q3. An analog signal carries 4 bits in each signal element. If 10,000 signal elements are sent per sec, find the Baud Rate and Bit Rate? Ans. Given signal carries r =4 Signal element s=10000 Let N be the bit rate We know that S = N*(1/r) à ° N= S*r à ° N= 10000* 4 à ° N=40000 bps Bit rate is equals to 40000bps Q4. What are the reasons for the imperfection caused in transmission media? How the perfection can be measured? Ans. There are certain reasons for the imperfection caused by the transmission media. These reasons are describe below: Attenuation: All the transmission media has some sort of loss of signal i.e. called attenuation which make then imperfect. During the transmission of the signal from one place to another the loss or energy is occurred which reduce the overall strength of the signals which is called attenuation. For this is reason amplifier is used in various place in the transmission. Noise: Noise is the basically the disturbance which is produced in the signal when the signal send over the transmission media then the natural and un natural climate affect the signal such as pollution etc.   So that some kind of distortion is occur in the signal. Every transmission media is affected with the noise which makes the signal imperfect. Distortion: Distortion means that the change in the signal. Due to some circumstance there must be change in the signal. The signal may deviate from actual one this is called distortion. The perfection can be measure in the form the above three. A transmission media which has less attenuation, less noise and less distortion that transmission media is called perfect. Q5. There are numerous multiplexing techniques available. What in your opinion is the most appropriate multiplexing technique for the fiber optics as well as copper wires? Ans. Multiplexing is the process of converting n signal to the one. There are various technique but two basic technique are FDM(Frequency Division multiplexing) TDM(Time Division multiplexing)   wavelength Division multiplexing In fiber optics multiplexing the best technique used is called WDM Wavelength division multiplexing. The basic principle of WDM on fibers is that n fibers come together at an optical chamber, each with its energy present at a different wavelength. The four beams are combined onto a single shared fiber for transmission to a distant destination. At the far end, the beam is spilt up over as may fibers as there were on the input side. Each output fiber contains a short special- constructed core that filters out all but one wavelength. The resulting signals can be routed to their destination or recombined in different ways for additional multiplexed transport. In the case of the copper wire Frequency division multiplexing technique is used. First the voice channels are raised in frequency, each by a different amount. Then they can be combined because no two channels now occupy the same portion of the spectrum. Notice that even though there are gaps (guard bands) between the channels, there is some overlap between adjacent channels because the filters do not have sharp edges. But nowadays there is use of the Time division multiplexing is used which is particularly deal with the digital signal. In this technique the conversion must be take place from analog to digital signals.   Q6. While transferring the data from the transmission medium there are various aspects of your data getting tempered by other users? Whats your opinion is the most secure and insecure transmission medium. Justify your answer with an example. Ans. Transmission media is the aspect which is caused for tempering of data by the other. All transmission media has this problem. When we use the copper wire it can be taped by another one. One of the improve version is the optical fibre which An improved media is fiber optic cabling, this media does not emanate any signals since it uses light sources to transmit the signals from node to node. It has proved to be the most secure media available for use on LANs today and will continue to be the most secure media until the black hats discover a way to tap it undetected. The last medium reviewed is the wireless media which uses the airways as their path from node to node. The only way to guarantee secure transmissions is to use a layered approach, or combination of techniques to try to encrypt the data. The best way currently to encrypt data over LANs is to use the IPSec protocol with any of the discussed media. IPSec security is compatible with all types of media so it is the one thin g in common with allmedia that will almost guarantee the security of the pathways between nodes. PART B Q1.Assume a stream is made of ten 0s .Encode this stream , using following encoding schemes .How many can you find for each scheme ? Unipolar NRZ-L NRZ-I RZ Manchester Differential Manchester Ans. 0 0 0 0 0 0 0 0 0 0 Unipolar: it can be drawn as: NRZ-L:   It can be drawn as: NRZ-I: it can be drawn as: RZ: it can be drawn as: Manchester: it can be drawn as: Differential Manchester: it can be drawn as: Q2. Two channels ,one with bit rate of 150kbps and another with a bit rate of 140kbps,are to be multiplexed using pulse stuffing TDM with no synchronization bits.Answere the following: What is the size of frame in bits What is the frame rate ? What is the duration of a frame? What is the data rate? Ans. Given bit rate of 1st channel=150 kbps Given bit rate of 2nd channel=140kbps Ans1. We allocate 3 slot for first and 3 slot for 2nd and we each size of frame is six bit. Ans2. Q3. Contrast   compare sampling rate received signal? Ans. In the conversion of the analog to digital, pulse code modulation is used. Sampling is the first stage of the PCM. The analog signal is sampled every Ts second. Where Ts is the sample interval or period. The inverse of sampling interval is called the sample rate or sampling frequency and denote fs where fs = 1/Ts. To produce the anolog signal one necessary condition is that the sampling rate be at least twice the highest frequency in the original signal. This is according to the Nyquist theorem. e.g. Wo well-known examples where sampled sound is used are the telephone and audio compact discs. Pulse code modulation, as used within the telephone system, uses 8-bit samples made 8000 times per second. In North America and Japan, 7 bits are for data and 1 is for control; in Europe all 8 bits are for data. This system gives a data rate of 56,000 bps or 64,000 bps. With only 8000 samples/sec, frequencies above 4 kHz are lost. Received signal strength is a measure of the power present in a received radio signal. RSSI is generic radio receiver technology metric which is usually invisible to the user of device containing the receiver but is directly known to users of wireless networking Q4. Synchronization is the problem in data communication. Explain? Ans. Synchronization technologies are designed to synchronize a single set of data between two or more devices, automatically copying changes back and forth. For example, a users contact list on one mobile device can be synchronized with other mobile devices or computers. Data synchronization can be local synchronization where the device and computer are side-by-side and data is transferred or remote synchronization when a user is mobile and the data is synchronized over a mobile network. In synchronous communications receiver, this specification discloses a decoder for generating a clock signal to synchronize the receiver with the information data rate of the received signal. The implementation of a decoder apparatus as a periodic finite state machine allows a clock signal to be extracted from the energy or transitions of the encoded signal. Such a decoder can define clock information over a large range of data rates. A band pass filter tuned to the characteristic frequency being re ceived can be coupled to the input of the decoder to limit the synchronization range to that desired by the receiver. Q5.Can bit rate be less than the pulse rate? Why or why not? Ans. Yes it is possible. Pulse rate is defined as the number of signals element send per second and the bit rate is defined as the number of data element which may be called bits in one second. Data communication needs to increase the data rate and decrease the pulse rate. So that the speed of transmission may be increased and decrease of bandwidth. But in some of the case it may be possible to the bit rate is less than pulse rate. This is done when the single pulse can carry more bits. When this happen the congestion Q6. A signal is sampled. Each sample represents one of four levels. How many bits are needed to represent each sample? If sampling rate is 8000 samples per second, what is the bit rate Ans. Given Sampling rate = 8000 We know that   bit rate   =1/Sample rate So bit rate =1/8000 =0.000125 bps

Descriptive Essay Beach

Miranda Poole 2/3/13 English 101 Descriptive Essay The Beach: A Relaxing Wonderland It is spring break, in the middle of March, my junior year. As I cross the state line into Florida, I picture the ocean as being a place of peace and serenity. It’s my first time visiting the ocean, and all I can think about is hoping it is as beautiful as the pictures I have seen of it. As I arrive to the beach with all my friends, the eagerness of seeing this peaceful place is rising. I can’t wait to smell the fresh salty air, feel the soft sand between my toes, walk along the breezy shoreline.As we approach the beach, the first thing I notice is the sky. As I look into the cloudless, cerulean blue sky and see the flawlessness of life; in the distance, rolling clear-blue waves crash into each other with such force as that of football players. The sky is breathtaking along with the sounds of the waves and the tide washing onto the shore. The water reminds me of crystals shimmering in th e water with the sun reflecting off of it. As the sun sets, the sky turns into a pink hue with a bright orange sun going down into the horizon.We stroll on the beach, and my feet sink into the soft sand. I stroll along, and the grainy, slick, brown sugar sand pulls my bare feet under and leaves a perfect imprint. I pick up a handful and sift it from my palm slowly, feeling the grittiness of sand with each finger. The view down the beach of the white, but slightly brown sand was enough to make my knees go weak. The sand is such a sensational feeling between my toes and a beautiful view against the crystal blue water. The beach is a beautiful scene of peace and tranquility. Every moment is a different scene.As I sit in my chair I can see all the sights of summer; children building sand castles along the ocean's edge, to my right I observe an elderly couple enjoying a good book. The waves crash into one another, the breeze blowing from the tide, the smell of salty ocean, and the sticky air clinging onto my skin. Charging into the ocean with vigorous splendor and utter excitement, I insert my bare feet into the sea and am taken aback by the shocking coolness of the water. Bringing myself to a halt at mid-calf, I then trudge through the soft currents that splash upon my legs. An abundance of symbiotic, vibrantly olored, and variously sized fish swarm around my feet. Their bodies brush my leg with negligence as they strive to get from one place to another. I wish to stay here forever and realize, at this point, this is where I need to come for serenity and harmony, where all things seem perfect and care free. There is nowhere in the world quite like this, so peaceful and calm. The beach is a wonderland for all ages. Whether you want to have fun in the sun, or relax while reading a good book, the beach is the place to go. The beach is an unforgettable experience that one must witness in their lifetime.

Monitoring Individual Accounts Receivable Accounting Essay

The name that looms largest in early accounting history is Luca Pacioli, who in 1494 first described the system of double-entry clerking used by Venetian merchandisers. Of class, concerns and authoritiess had been entering concern information long before the Venetians. But it was Pacioli who was the first to depict the system ofA debitsA andA creditsA inA journalsA andA ledgersA that is still the footing of today ‘s accounting systems. The dual entry system was foremost used in Genoa, Italy around the thirteenth century and was farther polished in Venice. Luca Pacioli wrote about the â€Å" Method of Venice † in his 1494 book, The Summa and this caused him to be called â€Å" the male parent of accounting † . This method called for three books to be used when entering minutess ; a memoranda book, a diary and a leger. Entries where posted from the memoranda book to the diary with debits on the left and credits on the right. A test balance was required at the terminal of a fiscal period. TheA industrial revolutionA spurred the demand for more advancedA cost accountingA systems, and the development of corporations created much larger categories of external capital suppliers -A shareownersA and bondholders – who were non portion of the house ‘s direction but had a critical involvement in its consequences. The lifting public position of comptrollers helped to transform accounting into a profession, foremost in the United Kingdom and so in the United States. In 1887, 31 comptrollers joined together to make the American Association of Public Accountants. The first standardised trial for comptrollers was given a decennary subsequently, and theA foremost CPAs were licensed in 1896. With the Industrial revolution concerns expanded to great size, both in footings of gross revenues, purchases and staff. These larger concern required capital and capital required investors who in bend required proper coverage of financess. They were besides capable to increased authorities ordinance and revenue enhancement. Accounting kept on progressing to the present twenty-four hours and involves the standardisation of reportingA and the development of international accounting criterions. The cognition economic system along with the on-going information engineering alterations is impacting the manner we are making concern. We are going clients of each other, and the economic value concatenation is incorporating our concerns with our providers, clients, and authoritiess. As accounting is concerned, these peculiar alterations are being reflected in the present tendencies of switching our attending from an disused quantitative attack to a qualitative compulsion where quality, client satisfaction, and invention become the most of import constituents. What is Accounting? Accounting is by and large considered to be the procedure of maintaining path of a concern ‘ fundss by logging itsA histories collectible, A histories receivableA and other fiscal minutess – frequently with accounting. Accounting is besides a profession consisting of persons holding the formal instruction to transport out these undertakings One portion of accounting focal points on showing the information in the signifier of all-purpose fiscal statements ( balance sheet, income statement, etc. ) to people outside of the company. These external studies must be prepared in conformity with by and large accepted accounting rules frequently referred to as GAAP or US GAAP. This portion of accounting is referred to as fiscal accounting. Accounting besides entails supplying a company ‘s direction with the information it needs to maintain the concern financially healthy. These analyses and studies are non distributed outside of the company. Some of the information will arise from the recorded minutess but some of the information will be estimations and projections based on assorted premises. Three illustrations of internal analyses and studies are budgets, criterions for commanding operations, and gauging selling monetary values for citing new occupations. This country of accounting is known as direction accounting. Another portion of accounting involves conformity with authorities ordinances refering to income revenue enhancement coverage. Today much of the recording, storing, and screening facets of accounting have been automated as a consequence of the progresss in computing machine engineering. What is bookkeeping? Bookkeeping involves the recording, hive awaying and retrieving of fiscal minutess for a company, non-profit-making organisation, single, etc. Common fiscal minutess and undertakings that are involved in bookkeeping include: Charging for goods sold or services provided to clients. Recording grosss from clients. Verifying and entering bills from providers. Paying providers. Processing employees ‘ wage and the related governmental studies. Monitoring single histories receivable. Recording depreciation and other seting entries. During the clerking procedure the bookkeeper must pay attending to inside informations on papers that is base for recording ( for illustration, amount, kernel of dealing, spouse of the company ) . In some legal systems there are prescribed demands sing information that must be included in papers. If all necessary information is non included, so papers may be invalid and can non be used for clerking. There are two bookkeeping systems: single-entry clerking system and double-entry clerking system. Single-entry system normally is used by persons and double-entry system is used by companies. A individual that does clerking is called bookkeeper, while a individual that does accounting ( uses informations provided by bookkeeper to fix revenue enhancement studies ) is called an comptroller. Bookkeeping requires cognition of debits and credits and a basic apprehension of fiscal accounting, which includes the balance sheet and income statement. The relationship between accounting and clerking. The footings accountant and bookkeeper are frequently used interchangeably, but they are non the same business. Bookkeepers are the line employees of the accounting map, executing invoicing, paysheet, hard currency aggregation and other everyday undertakings. Accountants supervise bookkeepers and have many other duties. Accountants and bookkeepers are responsible for entering the day-to-day activities of a company in the accounting records. These minutess are normally recorded by concern rhythm, and in larger companies a separate employee may be in charge of each rhythm. Everyday minutess are normally recorded by the bookkeepers, and more complex minutess are recorded by comptrollers. In fact, bookkeepers in organisations may be referred to as accounting clerks. Accountants vs. bookkeepers Book maintaining is merely record of dealing, but accounting is immense scientific discipline of recording, categorization, analyze and summarizing of concern dealing and reading of different consequence. 2. A book keeper ever works under caput comptroller and book keeper is frequently said history helper. 3. Calculation of revenue enhancement and filling of revenue enhancement return is the portion of responsibilities of comptroller. But, he can take aid from book keeper for tracking the sum of the incomes of concern. 4. Book maintaining is merely similar machine work in which book keeper passes the verifiers into books but accounting work is to the full professional and need high experience for analysis and reading of fiscal statements. 5. Most hard portion of book maintaining work is to rapprochement of bank history with base on balls book, hard currency balance with physical hard currency in manus, stock in books with physical stock in Go down. Most hard work of comptroller is to do concluding history and analysis of fiscal statements. Both bookkeepers and comptrollers play a cardinal function in your concern. The chief users of accounting information Accounting is frequently called the linguistic communication of concern because all organisations set up an accounting information system to pass on informations to assist people make better determinations. The accounting information system serves many sorts of users who can be divided into two ( 2 ) groups: External and Internal users. External information users External users of accounting information are non straight involved in running the organisation. Yet many of their of import determinations depend on specially information that is dependable, relevant and comparable. They include: Stockholders ( investors ) Lenders Customers Directors Suppliers The media Lawyers Each external user has particular information demands depending on the types of determination to be made. Lenders ( Creditors ) They loan money or other resources to an organisation. Lenders look for information to assist them assess whether an organisation it likely to refund

Definition Of Aps ( Comprehension ) - 1825 Words

APS 1 Definition of APS (comprehension): An effective teacher must constantly be thinking about long range goals for their learners. Their lessons should be implemented with a future follow up lesson in mind. Lessons should build off of each previous lesson to help the students learn sequentially. In order for a teacher to teach effectively, she must create lessons that aid in student success. Instruction should be developmentally appropriate for the particular grade level being taught. The objectives should be active and describe exactly what a learner should be doing and should learn from the lesson. The objectives should foster student centered learning and be connected with lessons that have already been implemented. These lessons†¦show more content†¦The objectives also specify what the learners need to do. Bloom’s Taxonomy provides more complex understanding through the levels of knowledge, comprehension, application, analysis, synthesis, and evaluation. The teacher’s next step is to implement a plan of instruction to convey content and skills the learner needs to master. The teacher should also reflect on ways to differentiate instruction based on the needs of individual learners in the class including specific tendencies, strengths, and weaknesses. The materials and use of technology should be thoughtfully prepared and written out to help keep a flow of the instruction. A prepared teacher is a positive influence on learners and demands high expectations of his/her learners. The lesson should also provide performance opportunities for the learners which provides a prime environment for the teacher to formatively assess the learners on their progress thus far. This constant check through formative assessment provide data which inform future lessons. Relationship Between Artifact and APS (analysis level): I chose my sixth grade English lesson plan on context clues as my artifact. It is an appropriate artifact for APS 2 because, (finish this statement). Before, I started to write this lesson I had to look at the standards and find the purpose of my