An overview of IEEE 802.11 (wireless network standard) Essay

An overview of IEEE 802.11 (wireless network standard) - Essay Example It is the most widely used wireless network standard. 802.11b standard was ratified by IEEE in 1999. The main features of this standard are as given below.These features are adequate for most data transfer applications and for accessing internet but might be inadequate for multimedia acce It might also face problems when users in large number access the network from a single access point. The frequency of operation, i.e., 2.4 GHz, coincides with the spectrum used by cordless phones, microwave ovens, etc. Therefore the interference problems are more likely to occur.802.11a suits to the conditions of multiple users accessing the network with high data rates. It is best suited for classrooms where students can access multimedia, digital video or database packages (BECTA, 2005).IEEE accepts the 802 standard logical link control (LLC) protocol. It also offers, for the purpose of wireless communication, physical layer (PHY) and medium access control (MAC) sub layers. There are two physical layers offered by 802.11 namely, direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS). According to the transmission methods and frequencies 802.11 is categorised into three main groups; 802.11b, 802.11a, 802.11g. The main features of these three categories have already been stated above. The main drawback of 802.11a is that it is not backward compatible with 802.11b as both of them use a different frequency spectrum. This results in lesser interest of users towards 802.11a. The advantage of 802.11a, however, is that it operates in 5 GHz spectrum which can be used unlicensed. The 2.4 GHz spectrum used by other two standards interferes with that of other devices such as cordless phones and microwave ovens. The 802.11 MAC supports two basic medium access protocols: contention-based distributed coordination function (DCF) and optional point coordination function (PCF). (Zhu, Hua, Li, Ming, Chlamtac, Imrich & Prabhakaran, B., 2004). PCF causes the wireles s channel to be divided into super frames. Super frames in turn provides two periods, a contention-free period (CFP) for PCF and a contention period (CP) for DCF. There is a device known as point co-ordinator which is usually an access point (AP). The point co-ordinator polls for grant of access to the wireless channel at the start of CFP. On obtaining the channel, it checks the stations regularly and sets priorities to these stations as per their importance, i.e., their

Choosing between Family and Individuality in Kate Chopins The Awakenin

Choosing between Family and Individuality in Kate Chopin's The Awakening      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Kate Chopin's The Awakening focuses on a woman's struggle to become an individual while still being a mother and wife. In the process of this journey, the female heroine discovers that establishing her own identity means losing a mother's identity. Edna looks to be the "brave soul," a "soul that dares and defies" (Chopin 61). Edna's society looked down upon females who seek anything other than attending to their children and husband's needs. Therefore, she is seen as an outcast and must turn inward as well as outward towards nature for satisfaction and approval.   Ã‚  Ã‚   At the beginning of The Awakening, Mr. Pontellier poses the question, "If it was not a mother's place to look after children, whose on earth was it?" (Chopin 7). He reflects the general belief of his time that women should be mothers who give up themselves for the more important needs of their children. He believes that women should be self-sacrificing beings who never take and always give. He thinks, just as other men believed during this time period, that she should be the "angel of the house," catering to his every need. Mr. Pontellier wants her to be one of the "ministering angels" (Chopin 9) who "idolized their children" (Chopin 9) and "worshipped their husbands" (Chopin 9). Mrs. Pontellier shows little interest in taking care of her husband and children, hinting that she seeks more than a life lived for others. She begins to "recognize her relations as an individual to the world within and about her" (Chopin 14) which inevitably becomes a curse in disguise. It crea tes a complicated inner conflict. Mrs. Pontellier ponders whether she should be defined as a mother and ... ...nature for acceptance and to her soothing childhood memories for forgotten innocence.    Works Cited and Consulted Chopin, Kate. "The Awakening." 1899. The Complete Works of Kate Chopin. Ed. Per Seyersted. Baton Rouge: Louisiana State UP, 1989. Culley, Margo, ed. A Norton Critical Edition:   Kate Chopin:   The Awakening.   New York:   W.W. Norton, 1994.  Ã‚   Edwards, Lee.   "Sexuality, Maternity, and Selfhood."   A Norton Critical Edition:   Kate Chopin:   The Awakening.   Ed. Margo Culley.   New York:   W.W. Norton, 1994.   282-285.   Walker, Nancy.   "Feminist or Naturalist."   A Norton Critical Edition:   Kate Chopin:   The   Awakening.   Ed. Margo Culley.   New York:   W.W. Norton, 1994.   252-257. Wolff, Cynthia.   "Thanatos and Eros."   A Norton Critical Edition:   Kate Chopin:   The   Awakening.   Ed. Margo Culley.   New York:   W.W. Norton, 1994.   231-241.

Costa Launches New Flavour Drinks This Winter Essay

?Try Cioccospresso! Costa launches new flavour drinks for this different winter 12/11/2014 Costa is looking to create warmth this winter thanks to a brand new offering that will light up your taste buds. As the UK’s fastest growing coffee shop chain ,costa never stops its steps in innovation. This time, costa try to deliver an intense chocolate experience to you by offering Costa Cioccosresso, an upgraded chocolate drinks which will be available to buy in Costa and Costa Metro from 12th November 2014. It’s time to try something new besides your favorite coffee. Cioccospresso brings the zesty tastes right to your cup:chilli,vanilla,orange,mint and ginger. Combined with newly found cocoa and natural brown sugar,and topped with whipped cream and baking spices, this new drink addition offers you mellow enjoyment without adding milk. During her vocation in Mexico,Victoria Stewart, one of Costa’s barista, discovered this magic drink and brought it back to dear you. It’s even better that Cioccospresso is made with patented machine specially designed by Costa to keep its original aroma and healthy effects. Andrew Tornatore, senior marketing director for Costa’s UK, said: â€Å"This is another delicious addition to the Costa’s menu and one we’re proud to be launching. We always try to offer more healthy beverage and food to our customers, which is why we try hard discovering better ingredients and techniques. New additions like Cioccospresso is one of our achievements. Great healthy effects such as reductions of migraines,risk of cardiovascular problems and blood pressure will be shown to you while the beverage still upholding the high standards. † The initial launch will also be hold in Leicester Square branch in November 12th,Aztec historians and health experts will be attending to present more information. Except that,Costa’s online activities waiting for your involvements as well,show your â€Å"Chocolate indulgence† and win free holidays! To find your nearest store, for more information or to view a menu visit www. costa. co. uk or Costa’s Facebook fan page. Press Enquiries: Nina Chen University of Leeds 0783 5xxx xxx Tuesday 10th November, 2014.

The Components Of The Communication Process - 1612 Words

Abstract Communication is extremely important to the success of an organization. The communication process identifies ways to exchange information, plans, ideas and reports. In a business place communication is how employees receive tasks and job expectations through management. This research study outlines the components of the communication process. The findings in this context will also explain the different types of communication. Verbal, written, nonverbal and visual communication is examined to get a detailed understanding of the communication process. Businesses use communication to introduce polices, events, regulations, orientation, job descriptions and many other important assets to running an organization smoothly. A misuse of the communication process can potentially cause a lack of productivity, confusion within the employees and also a bad reputation for the manager and the business. This research paper is an examination of how communication process is used in business. In socie ty today, communication is substantial for the preparation of success in any organization. Keywords: business, sender, receiver, message, organization, management, communication. Communication Process Communication generally starts from incubation and once incorporated it is used to dispense a message to a source. Effective communication skills are beneficial to the daily operations of a business. Communication can be utilized as a tool to influence how someoneShow MoreRelatedThe Process of Verbal and Nonverbal Communication1413 Words   |  6 PagesCommunication Paper Introduction Communication is important to virtually all spheres of human influence. Through communication, man is empowered to understand his immediate environment. If there was no communication, it would be impossible for man to gain knowledge that would inform his comprehension of his immediate environment. Communication comprises two major types; the verbal and non-verbal forms (Cole and Smith, 2008). 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