Blog by alisha ansari | Digital Diary

The medium access control

sub layer network link can be divided into two categories to use in point to point connection and those using Road card channel this chapter deals with broadcad links and their Protocol in any broadcad network the key issue is a how to determine who get to use the channel when there is competition for it to make this point consider as conference call in V6 people on 6 different telephone are all connected to that is one can hear and all to all the others it is very likely that when one of them stop speaking to or more will start talking at once leading to chaos..

the channel allocation

problem the central theme of this chapter is how to allocate a single broadcast channel might be a portion of the Wallace spectrum in a Geographic region or a single wire or typical Optical Fibre to which multiple note and corrected it does not matter in both cases the channel connect each user to all other user and any user who makes full use of the channel interface with other user who also wish to use the channel..

. static channel allocation

the traditional why of allocating a single channel such as a telephone trunk among multiple committing user is to job it's capacity by using one of the multiplancing scheme such as Frequency division multiplexing if there are any other band with divided into equal size portion with each user being assigned one position...

digital modulation

Now that we have study the proprietor of word and wireless Channel V turn or attention to the problem of sending Digital information wires and wireless channel carry an along single signal such as continuously where are you voltage light intensity or sound intensity to Sand Digital information we must device analogue signal to represent this between bits and signal that represent when is called digital modulation..

. definition

channel are often shared by multiple signal after all it much more on resigned to use a signal wire to carry several signal than to install a wire for every signal this kind of sharing is called multiplexing it can be a complete in several difference...

baseband transmission

he most straight forward from of digital modulation is to use a positive voltage a represent and in negative voltage to represent a 0.4 and optical fiber the reasons of high might present a one and the absent of light might represent is 0. Scheme means that the signal follow the data and example is showing figure...

clock recovery

whole all scheme that in codebids into symbols the receiver must cannot when one symbol and and the next symbol begins to correctly decod the beast with an r z in which the symbols are simply voltage level in long run of 0s the signal and changed after a will it unless you have a very accurate clock

Guided transmission media

the purpose of the physical layer is to transfer beeds from one machine to another where is physical media can be used for the actual transmission is one has it a one needs in term of a band with daily cost and of installation and maintenance media are roughly grouped into guided media such as copper wire and fibre optics and unguided media set as traditional wearless and Laser through the year....

magnetic media

one of the most common voice to transport data from one computer to another is to write them on to Magnetic tape or removable media physically transport the tab or is to the destination machine and them back in again althope this method is not as sophisticated as using communication and so on....

twisted pairs

alt the bandwid characteristic of Magnetic tape are excellent the delay characteristic are poor transmission time in measure in minutes of hour note mileage seconds for many application and online connection in needed one of the oldest and still most common transmission media in twisted pair a twisted pair consist of two insulted copper wire typically about I am thick...

Introduction

each of the pass 3 countries was dominated by a single new technology the 18 country was the era of the great mechanical system accompanying the industrial revolution the nine country was the age of the stem and during the 20 country the key Technology was information getting processing and distribution among other development we saw the installation of work wide Telephone Network....

uses of computer network

before we start to exam the technical issue in detail it is what devoting some time to pointing out by people are interested in computer and network few of them would be built we will start with traditional uses at companies than more on to become home networking and rescent development regarding mobile uses and finish with social issues...

business application

most companies have a substantial number of computer for example a company may have a computer for each worker and use them to design product write browser and do the payroll initiative some of these computer may have work installation from the order but at some point management may have decided to content them to be able to distribute information throw out the company...

. home application

in 1977 can also present of the digital equipment corruption than the number to computer vendor in the world when ask why detail digital was not going after the personal computer market in a big way he said there is no reason for any individual to have a computer in his home history show otherwise and digital number longer exist people initiative computer for what processing and games...

Product matric

measurement is a process why which number or symbol all assigned to the attributes of identities in the real world in such a way as to define team according to clearly define rules in the physical science medicine economics and more recently the social science we are now able to measure attribute that we prevently of course such measurement are not as friend as many measurement in the physical science..

. a Framework

for product Matric measurement assign number of symbol to attributes of entity in the real word to accomplish the measurement model accommosing a consist that of rules in required all thought theory of measurement and this application to computer software are topic that are behind the scope of this book...

measure Matric

and Indicator health of the term measurement and Matric or often used in the changebility it is important to not the septal difference between then because measure can be used either as and known a verb definition of the term can become confusing within the software engineering content a major provided a quantitative indication of the extent amount..

Software configuration management

software conservation management is an umbrella activity that is applied throw out the software process because change in accurate at any SCM activities are developed to identify change control change insure that change is being properly implemented and report change to other who me have an interest it is important to me I clear disconnection between software support and software configuration management support is a set of software engineering activities that acute software has been deliver to the consumer...

software configuration management

the output of the software process in information that may divide into three both categories one computer program was source level and exetable form and work product that describe the computer program there at various shake holder and their data or content within the program or external a software engineering work progress a higher software configuration item...

and software configuration scenario

a typical configuration management operational scenario involve a project manager who is the charge of a software group A configuration manual who is in change of the CM producer and policies the software engineering who are responsible for developing and maintaining the software product

Security engineering

what the other discuss more than a decide ago have multiplyed with the explosive growth of the web the you be quiet presents of mobile application and the wire is separate use of the coloured each of these Technology about user privacy and the potential loss of personal information security is not just a concert to the people...

analysing security requirement

requirement for software security all determined by working with the customer to identify the SS that must be protected and the cost associate with the loss of those SS should a securities branch acute the value of the loss of an assist in Kanno it is explore...

internet

of things some various describe an internal of things which everything real has a virtual counterpart on the internet is virtual entities can produce and consume service and collaborate toward a common goal for example as your phone cannot about the user physical and mental state thought and network of surrounding device that can act on the user..

Testing guideline mobile

as that execute entire on a mobile device can be tested using traditional software testing method our using amulators running on personal computer on the other hand did client mobile app that make use of server based resources are particularly challenges in two taste in addition to many of the testing challenging present by web app that testing or in mobile as must also consider termination of data thought inter net gateways and Telephone Network.....

the testing strategies Technology

alone in not substan to generate commercial success of a mobile have users abandon mobile as quickly if they do not work will or fail to meet acceptation it is important to recall that testing has to important goals to create test causes that and cover defect early in the development cycle and to verify the presence of important quality attribute the quality attribute for mobile based on this set for as and in compass functionality use ability efficiency...

are conventional approach

applicable a comprehensive mobile app testing program include the joining sample approach discuss in but will also include adoption discard or client server AR teacher real time computing graphical user interface web apps

Web app design quality

every person who has sulfate the web has an opinion about what makes a good web page individual we point very widely some user enjoy fleshy graphics other one simple text some demand copen information other Desire and absorted presentation some like analytical tools or database Axis other like to keep it simple and the user preception of goodness and the result acceptance of rejection of the web app as a consequently more important than any technical discuss of web quality...

design goals

in her regular column on web design gents suggest a set of design goal that art applicable to Virtually every web regardless of application domain size or complicity...

a design pyramid

for web apps what is design in the contacts over engineering the simple question in more difficult to answer then one why to believe person and love discuss these when they bright the creation of an effective design will typically required a diverse set of skill sometimes for small project a single developer may need to be multi skill for larger project it may be advisable and or festival to draw on the expertise...

interface design

when a user interact with a computer base system is set of fundamental principle and awarding design guideline apply these have been discuss in Ultron web app present if you special user interface design challenges the basic principle and guideline and applicable

Quality concept the drum bed for improved software quality begin in earnest as software become increasingly integrated in every fact of our life by the 19 major Corporation recognise the billion of Roller each year we are being wasted on software and it deliver the future of functionality that where promise both Government and industry become increasingly conserve that a major software might triple important infrastructure costing tense of billion more... what is quality you cannot what it is here you don't can what is but that cell can directory but somethings are better than other that is they have more quality but when you try say what the quality is apart from the thing that have it all girls to their and nothing to talk about but if you can say what quality is how do you cannot what is is or how do you cannot that it even exist if no one cannot it is done for all practical purpose is don't exit at all but for all practical purpose it really does it Fortune for somethings and throw other in the trust will obviously somethings our better than other but what the betterment... software quality even the most software development will agree that high quality software is an important goal but how do we defense software quality in the most general scenes software quality can be define as an effective software professor applied in a minute that grades a useful product that provide miserable value for those who produce it and those what use it... gary's quality dimensions David guaran suggest that quality should be considered by taking multi dimensional viewpoint that being with the assignment of conformance and terminals with a transactional view
Read Full Blog...