Rosa Parks Impact On History - Free Essay Example

Sample details Pages: 2 Words: 530 Downloads: 10 Date added: 2019/03/27 Category Politics Essay Level High school Tags: Rosa Parks Essay Did you like this example? Rosa Parks, one of the most monumental women in United States history. Rosa Parks really helped remove segregation in America and was a Civil Rights Activist during the 1940s and continued until the end of segregation. Rosa Louise McCauley was born on February 4, 1913 in Tuskegee, Alabama to mother Leona and father James McCauley. Leona was an elementary school teacher for over 40 years, Mr. McCauley was a carpenter in Montgomery, Alabama, even though Rosa was born in Tuskegee, she grew up in Montgomery. Rosa went to high school at Highlander Folk HS, where she did very well as a student. She would later go to Alabama State for Teachers as she thought she wanted to teach alike her mother did. She ended up dropping out as her grandmother became very ill. Parks also recalls many incidents where racism occurred, one of her most memorable was when her Grandmother stood at the house door with a shotgun as the KKK walked out in front of their house. Don’t waste time! Our writers will create an original "Rosa Parks Impact On History" essay for you Create order Rosa Parks enjoyed attending church with her family, and was also a participant in the African Methodist Episcopal Church. And before she went to public school, she was homeschooled, and would take many vocational and educational classes. She had taken interest in teaching because of her mother. Rosa also loved school, unfortunately she had started at the age of 11 years old because of Jim Crow laws, and also had to drop out early. As an African-American woman in the 1930-50s, life was very hard. As Jim Crow laws and segregation were impossible to ignore and really affected her quality of life. Gender equality was also not existent at her point in time. Knowing this, Rosa still had to work to provide for herself. This would one day lead to the famous Montgomery Bus Boycott. Montgomery was a place of radical racial segregation and was incredibly hard to live in for any black person. On December 5, 1955, Rosa was coming back from work, and was taking the bus back home when she had sat down after a hard and long day at work. A white man at a bus stop walked on to the bus and ordered Rosa to leave, Rosa refused. This led to Rosa being imprisoned, many African-Americans in Montgomery decided to stand up with Rosa, and went on strike with the Bus Company. The African-American community didnt take the bus and instead walked for 380 days, until the law that not matter your race you can sit down on a bus. Rosa Parks became a symbol for the struggle for civil rights. Due to severe harassment by bigots, she and her family were forced to leave Alabama and move to Michigan, but she continued to promote civil rights for the rest of her life. She received many honors, including the Presidential Medal of Freedom and the Congressional Gold Medal. She only had used her platform to push for equality for African-Americans and had solidified herself in history as one of the most influential people in the ending of Jim Crow laws. Unfortunately, Rosa Parks passed away on October 24, 2005 in Detroit, Michigan. Rosas impact will always be engraved and never forgotten is United States history.

The Ghost Of Old Hamlet - 1466 Words

The ghost of Old Hamlet is an important part of Shakespeare’s Hamlet, but the ghost does not appear to all of the characters. The audience first sees the ghost when it appears before Horatio and the watchmen, Bernardo and Marcellus, who are both minor characters who do not play a major role in the play. Hamlet also sees the ghost later, and the audience only hears the ghost speak in interactions between him and Hamlet. However, because the ghost’s words are not real, it also brings forth the question how Hamlet suspects that Claudius poisons Old Hamlet through his ear. However, the ghost is invisible to Gertrude, the wife of Old Hamlet, even though the ghost loves Gertrude. The fact that Gertrude is unable to witness the ghost brings forth the question of the ghost’s existence, and also makes the audience wonder the reason the ghost does not show up in the play after the meeting between Hamlet and Gertrude. The nonexistence of the ghost’s words also chang es how the audience perceives the end of the play, as revenge changes from the father’s wish to the son’s desire. Therefore, Gertrude’s inability to see the ghost of Old Hamlet suggests that the ghost that appears before Hamlet when he talks to Gertrude does not exist, unlike the ghost that the characters see at the start of the play, and with this interpretation, it portrays Hamlet as a closer foil to Laertes, and changes the play to a tragedy in which a man tries to honor his father. Bernardo, Marcellus, and Horatio,Show MoreRelatedThe Importance Of Ghost In Hamlet761 Words   |  4 Pagesstories, ghosts play an important part in the plot, as they enhance the reader’s view of the characters and the events that take place. The play, Hamlet, written by William Shakespeare, in 1609, explores the theme of ghosts and real people living around them. The play is about Prince Hamlet, whose father was murdered during his sleep by his brother, Claudius, who later became the king and married Prince Hamlet’s mother. Throughout the play, Hamlet wants to take revenge, and the ghost guides Hamlet toRead MoreMurder and Marriage in William Shakespeares Hamlett1312 Words   |  5 PagesShakespeare’s play Hamlet, this is Hamlet’s reality. Hamlet’s uncle, Claudius, killed his father, Old Hamlet, the king of Denmark, and then his mother, Gertrude, and uncle got married approximately two months later. The effects of these morbid events are substantial on the young prince’s psyche. Later, the ghost of Old Hamlet appears to Hamlet and commands him to exact vengeance for what Claudius has done and murder the new king. 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Digital Comm Tutorial Free Essays

string(29) " stability of 1 part in 107\." The process of quantisation introduces an error or noise component into the quantised signal. Derive an equation for the mean-squared quantisation error in terms of the quantization interval ‘a’. ii) Hence show that the peak signal-to-quantisation noise ratio (SQNR) is SQNR = ( 6n + 4. We will write a custom essay sample on Digital Comm Tutorial or any similar topic only for you Order Now 8 ) dB Where 2 n is the number of quantisation levels. b)i) Linear quantisation is used prior to binary PCM encoding of an analogue baseband signal which has a uniform probability density function. The signal-to-quantisation noise ratio must be no less than 35 dB. How many binary bits are required to code each quansation level? ii) If the bit rate is 104 bits per second, what should be the maximum bandwidth of the analogue signal prior to sampling? Q2. a)i) Explain how nonlinear quantisation can be used to reduce the number of levels required to quantise a signal. ii) Explain why logarithmic quantisation is preferred. iii) What types of signal is most suitable to be processed by non-linear quantisation? b) Sketch the A-law companding curved. Explain why companding is used in voice transmission systems. c) Show that the dynamic range of the logarithmic portion of the A-law compander is 38. dB and that the improvement in signal to quantisation noise ratio realized for small signals, compared with linear quantisation , is 24 dB. d) For an 8-bit A-law companded PCM system, calculate the SQNR obtainable and the PCM bit rate. Assume the sampling frequency is 8 KHz. Q3. a) Explain (qualitatively) how Differential Pulse Code Modulation (DPCM) can reduce the transmission bandwidth required. b) Explain what is delta modulation. Why it is particularly suited to speech signals? c) For an input sinusoid of frequency 1 kHz, estimate and compare the signal-to-error ratios of a linear PCM coder using a sampling rate of 2. kHz and 7 bits per sample quantisation with a single-integration delta modulator producing the same gross bit rate. BASEBAND REGERATOR / ERROR PROBABILITY / LINE CODE Q4. a) Digital transmission systems provide better received signal quality compare to analogue transmission systems when implementing a long distance communication link. Explain briefly why this is so. b) A PCM transmission link employed 8 bit coding and uses baseband regenerator as repeater. Determine the Signal-to-Noise ratio obtainable at the receiver assuming no bit error occurred. c) An analogue transmission system required amplifiers to be spaced every 2 km apart. Assume the Signal-to-Noise ratio of the amplifier is 65 dB, determine the maximum distance of the link before the quality of the received signal is lower than the PCM link above. d) A RF binary PSK system operates with phase states separated by 180o. The bit rate is 2. 0 Mbit/s and the noise power spectral density at the input to an ideal matched filter detector is 1. 0 pW/Hz. If the transmission loss between transmitter and detector is 40 dB, what power must be transmitted to achieve a probability of bit error of 1( 10-6 ? For binary PSK , Pe = ? [1- erf(Eb/No)1/2] Error function tables are provided. Q5. ) Draw a simplified block diagram of a PCM regenerative repeater. b) An ideal 18 – section, copper cable, PCM link employs unipolar , NRZ, rectangular pulses on each section and a center point detection process at each repeater. The probability of error versus SNR for this transmission and detection scheme is given by [pic] If all sections were identical, and operated with a section SNR of precisely 18 dB, what would be the overall probability of error for the entire link? Q6. (a) Sketch the typical, long term, spectrum of a speech waveform. Show on your sketch the bandwidth normally considered sufficient for telephone quality transmission. b) i) If the voice signal in part (a) is to be transmitted using 8-bit PCM and use the bandwidth upper frequency limit shown on your sketch to find the required PCM bit rate. ii) What channel bandwidth, in principle, would be required if the PCM bits were to be transmitted as perfectly rectangular pulses without distortions? iii) What is the minimum theoretical bandwidth which would allow the PCM bits to be transmitted independently (i. e. without inter-symbol interference (ISI) at the receiver sampling instants)? Explain your answer. (c) i) What is the main functions of line codes? i) The bit stream shown in Fig. Q7 is to be line-coded using the high-density substitutiontechnique HDB3. Sketch a version of the resulting coded signal. What are the features of HDB3 which makes it an attractive line code? [pic] Fig. Q6 TDM / PDH / SDH Q7. a)i) Describe, with the aid of a diagram, the way in which analogue telephone channels plus signalling and service information are combined in a plesiochronous time-division multiplexed system to form the primary multiplex group. ii) What sampling rate would be appropriate for each telephone channel and what would be the gross bit rate of the multiplex group? )i) Show how primary multiplex groups may be combined to form higher level multiplexes and to provide access for wideband signals. ii) Explain why it is necessary in a high order Plesiochronous digital hierarchy (PDH ) to de-multiplex down to the lowest order whenever a single channel is to be extracted or inserted. c) Calculate the number of telephone channels which can be accommodated at level 4 of a PDH. d) In the PDH, explain why the bit rate at a given level is not exactly an integer multiple of the bit rate at the level below. Q8. a) Explain why bit justification is required in a PDH network, and describe how it may be performed. ) i) Determine the minimum and maximum input channel rates accommodated by an CEPT2 multiplexer. ii) Determine the rate of CEPT1 misframes caused by erroneous interpretation of a stuffed bit. Assume channel bit error rate Pe is 10-6. CEPT2 parameters: Bit rate8. 448 Mbit/s Master frame length848 bits Message length/channel205 bits Framing bits12 bits Stuffing control bits12 bits Stuff bits4 bits c)i) Explain what is frame slip. ii) In a PDH network, the primary multiplex clock generators have frequency stability of 1 part in 107. You read "Digital Comm Tutorial" in category "Papers" Calculate the average number of frames slips per hours in a connection of 5 inter- exchange links. Q9. a) Describe the essential features of the Plesiochronous Digital Hierarchy (PDH). b) Plesiochronous networks have a number of disadvantages by comparisons with the Synchronous Digital Hierarchy. State and explain two of them. c) Draw a block diagram illustrating the SDH. Show on your diagram the nominal STMbit rates associated with each SDH level. d)i) Describe the SDH primary-rate frame structure with particular reference to the location within the frame of the section overheads, the (administrative unit) pointers and the STM-1 payload. ii) What are the main functions of pointer? SIGNALLING Q10. a)i) Explain the need for signaling in a telecommunication system. ii) List the minimum basic signaling requirements, and show how they may be obtained in the subscriber loop of a typical telephone network. b) Draw a simple block diagram illustrating the essential difference between channel-associated signaling (CAS) and common channel signaling (CCS). c) List the advantages of CCS over CAS. d) Modern digital switching systems using Stored Program Control (SPC) employ CCS. Draw a block diagram showing how CCS may be implemented. e) What is the disadvantage of CCS and how are they overcome? Q11. ) Show how the ITU-T (formerly CCITT ) signaling systems No. 7 conform to theInternational Standard Organisation, Open Systems Interconnection (ISO-OSI ) model. b) What are the three types of signal units employ by the ITU-T SS No. 7? What is the function of each? c)i) How is the channel associated signaling handled by the 30+2 PCM primary multiplex frame? ii) Calculate the bit rate of th e signaling channel with one voice channel. TELETRAFFIC THEORY Q12. a) In a switching system for which blocked calls are lost, the average number of calls per hour is 200 with an average holding time of 3 minutes. Estimate the number of trunks required to achieve a grade of service of 0. 1 %. b) On the average during the busy hour, traffic generated in exchange A and exchange B is shown in table Q13. Assume no tandem traffic, estimate the number of trunk channels (two way connections) required for a grade service of 1 %: i) if the same lines are used for incoming and outgoing calls, ii) if separate lines are used for incoming and outgoing calls. Evaluate the above options and propose a cost effective solution. What is the minimum number of trunk lines required to serve the two exchanges? |Exchange A |Exchange B | |Exchange A |- |36 Erlang | |Exchange B |43 Erlang |- | Table Q13 c) Calculate the number of channels needed in a seven-cell re-use pattern cellular systems to achieve a blocking probability of 1 % if there are 2800 calls per cell per hour, each of average duration of 1. 8 minutes. (use traffic table). Q13. a) Define traffic intensity and congestion. ) Explain why it is necessary to determine the traffic variations as a function of time for a telephone exchange. c)For a telephone exchange designed based on blocked call lost assumption, the probability of there being k calls in progress with N trunks carrying traffic A Erlang is given by: [pic][pic] i) Explain what is meant by blocked call lost. Give an evaluation the effect of this assumption. ii) Derive an equation for the probability all servers are busy and the subscriber encountered call blocking. State the assumptions made for the above equation to be valid. ) A PBX with 250 internal lines has 10 trunks to the public network. i) What is the probability of call blocking if each internal line is involved in four external calls with an average duration of 2. 5 minutes per call, per eight-hour working day? ii) How many additional trunk connections would be required to improve the grade-of service to better than 0. 5 %? Q14. a) In a que ueing system, the average rate of packet transmission is ( frames per second, and the average arrival rate of data is ( packets per second. The probability that therewill be n packets in the queue is Pn = (1 – ( )( ( ) nwhere ( = ( / ( b) Derive an equation for the average number of packets in the queue and show how this varies with the parameter ( . c) How would you use this equation to design the node in a packet-switched system? d) If the switching node has a transmission capacity of 800 packets per second and the packet arrival rate is 500 packets per second. i) Calculate the average number of packets in the queue and hence ii) Calculate the average waiting time per packet. iii) What is the mean delay introduced by the switching node on a packet? ) A common –channel signalling system uses a 64 kbits/s data link to serve a group of 1500 speech circuits on a route between two exchanges. The busy-hour traffic is 1000 E and the average call duration is two minutes. On average each call requires transmission of ten messages (five signals plus five responses) and the average message length is 20 octets. Calculate the percentage of messages which encounter delay and the mean delay for these messages. DATA COMMUNICATION NETWORK Q15. a)i) Describe the principle of data communication by packet switching. ii) Evaluate the advantages of this strategy by comparison with circuit switching. )Show how the format of a packet can allow inclusion of routing, error correction, synchronisation and data. c)A packet switch has a single outgoing link at 2. 048 Mbit/s. The average length of each packet is 960 bytes. If the average packet delay through the switch must be less than 20 ms, assuming an M/M/1 queue, determine the i) maximum total packet arrival rate ii) average length of the queue. Q16a) Outline the ISO-OSI data communication network model. b) i) At which layer of the ISO-OSI model does the routing information provided? ii) Name and describe briefly two common routing protocols for the Wide Area Network (WAN). ii) Compare the relative performance of the protocols. iv) give an example of the connection standard applicable to each. c) Describe the format of a High-level Data Link Control (HDLC) packet and describe how this could be employed to implement call set-up, data transfer and call clearing in a virtual circuit. ISDN / B-ISDN Q17. a) Most national tele-traffic networks have evolved from systems using analogue telephonyand signaling and electromechanical switching. Show, using diagrams, how it has been possible to develop Integrated Digital Networks (IDN) whilst retaining much of the transmission network. ) An IDN is required to provide communication of information in addition to digital telephony signals. Describe the others signals necessary to operate an IDN and show how these can be integrated within a single network. c) Outline the potential benefits of an ISDN. d) Describe the data handling capabilities of Basic Rate Access and Primary Rate Access ISDN services. What are the gros s bit rates in each case? Q18. a) Describe the process which takes place in a packet speech transmission system and outline the transmission delay which might be expected. ) In a packet communication network packets arrive at a switch according to a Poisson distribution with a mean arrival rate of 4 packet/s. The service time is exponentially distributed with a mean value of 100 ms. Assuming that each packet contains 70 bytes and the output transmission rate is 5. 6 kbit/s. How long, on average, does a packet have to wait in the queue? If the switch in part (c) is limited in length to 10 packets, what is the probability of losing packets? c) What extensions to these access processes will be required to handle multi-media terminals and what data transfer method will be most appropriate? ) What are the numerical values of the following: i) ATM cell size. ii) ATM information field size. iii) SDH STM-1 bit rate. iv) PCM voice channel bit rate. e) Use your answer in part (d) to find the expected total network delay (including packetisation delay) experienced by a voice signal transmitted over an ATM network connection operating at the SDH STM-1 bit rate. The connection traverse 8 switching centers, each of which introduces a mean delay equal to 98 ATM cells. The transmission path length is 350 km in total, and the specific delay of the transmission medium is 5 (s/km. How to cite Digital Comm Tutorial, Papers