wireless information networks ● Line switching ● DTMF – dual tone multi frequency ● Telephony protocol ● Standards in telecommunication ● Digital telephony networks – PCM ● ISDN – Integrated Services Digital Network ● D channel ● DSS1 layer 3 protocol 5 | 54 Communication Systems History of telephony networks ● Traditional analogous telephony networks – 1848: State Telegraphy System in Prussia (Siemens) – 1851: First trans-sea cable between Dover and Calais – 1858: Transatlantic
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multiple layers of security‚ including communication security‚ operations security and information security. Among all‚ information security stands out and we should pay enough attention to protect it. The C.I.A triangle was used to address the importance of three characteristics that give value to corporations (C stands for
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Analgesic’s Active Component seeks to separate‚ identify‚ quantify and analyze the active component found in Biogesic®‚ which may be useful for public awareness despite its wide acceptance and availability in the market. Furthermore‚ this study applies thin layer chromatography (TLC) technique since it is the simplest‚ cheapest yet most effective approach in terms to the study’s objectives. The TLC method implies Rf (Rate of flow) values where it is given by the distance from origin to center of subtance spot
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was invented by a Russian botanist‚ Mikhail. S. Tswett‚ to assist him in the study of the analysis of the coloring in plants in 1903. (factmonster.com) There are four basic methods of chromatography: liquid chromatography‚ gas chromatography‚ thin layer chromatography and paper chromatography. Paper chromatography is the best method of separation used in candy chromatography. There are two phases incorporated in the process of separation of the candy color dyes. chromatography works because the components
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The hospital uses a network bridge to interconnect its logical network. A network bridge connects multiple network segments at the data link layer‚ which is Layer 2 of the OSI model. The Data Link Layer enables data to be transferred between network entities and might provide the means to detect and possibly correct errors that may occur in the Physical Layer. The hospital’s network is an Ethernet network. The Ethernet network uses a protocol called CSMA/CD which stands for Carrier Sense‚ Multiple
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CompTIA Security+ (Exam SY0-301) quick reference sheet Table of Contents .............................................................................. Fundamentals.............................................................................Page 1 Threats and Vulnerabilities.....................................................Page 1 Network Security.......................................................................Page 3 Application‚ Data‚ and Host Security..........................
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aqueous phase. OH O NaOH + NaI + H2O CH3I Before coming to lab‚ please review the following techniques: "Reluxing a reaction‚" "Extraction and washing‚" "Drying an Organic Solvent‚" "Evaporating an Organic Solvent‚" "Analyzing a Solution by Thin Layer Chromatography (TLC)‚" "Separating Mixtures by Column Chromatography‚" and "Characterizing Compounds by IR." Notice that this lab brings together most of the techniques that we have used this semester. Then complete the following table before coming
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SECURE ELECTRONIC TRANSACTIONS Introduction Secure Electronic Transactions (SET) is an open protocol which has the potential to emerge as a dominant force in the securing of electronic transactions. Jointly developed by Visa and MasterCard‚ in conjunction with leading computer vendors such as IBM‚ SET is an open standard for protecting the privacy‚ and ensuring the authenticity‚ of electronic transactions. This is critical to the success of electronic commerce over the Internet; without privacy
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Function Functions are basically the exact same as subroutines‚ except that they return a value. That means that the function itself has a type‚ and the function will return a value to the calling subroutine based on the code that it contains. An example of this would be a function that adds two numbers‚ shown below. A function is declared the exact same way as a subroutine‚ except using the "Function" keyword instead of "Sub". To return a value‚ assign a value of the proper type to the function’s
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an unknown mixture of colored compounds. The mixture will have three compounds from the following: azobenzene‚ azulene‚ 4-(p-nitrophenylazo)resorcinol‚ methyl red‚ bromocresol green. You can identify the components by separating them using thin layer chromatography (TLC) and comparing their Rf values with those of the
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