Exercise Write a 2 page summary of the main points of Chapter 4. Choosing a personal computer one should take into account a number of pints. In the first place, it is important to determine what the computer will be used for – the user’s needs are to be clearly defined (like when, where and for what purpose). Then, on the basis of those needs, one has to choose between a desktop, a laptop or a tablet. It is also important to determine how the Internet will be accessed. The options include: a cable; Fiber Optics, which is the most secure and fastest transmission; satellite data transfer; a phone line and a modem, which is a device that turns analog signals into digital ones.
The most common modems today are DSL ones. When selecting an Internet service provider, pay attention to the time it takes the company to repair the system if there is a problem with delivery of the transmission, take into account offered transmission speed (Mbps) and the costs. Also, run speed checks periodically. When choosing a laptop, determine what screen size is needed (because it determines the cost) and battery life, though it depends on usage. Considering any computer, pay attention to the CPU (central processing unit), expansion options, RAM (memory), graphics adapter, hard drive, number of USB slots, GPU (graphics processing unit).
Also, choose the needed storage device: internal, external or network attached storage (cloud computing, which is software that is accessed and used via the Internet). Decide on the mobility and ergonomics of the keyboard and the mouse. In any case, the budget should be set before choosing a computer. Also, it is important to reflect on the difference between needs and wants.
When choosing a printer, take into account speed, color, resolution, memory and ink replacement. Choosing a cell phone, take into consideration the wireless carriers, since they may use different network technologies, the most popular of which are GSM and CDMA. The tow technologies use different Subscriber Identity Module (SIM) cards, which are tied to the corresponding network. These days it is also important for the phone to have Internet access. So consider this option, as well as battery life and availability of Speech Interpretation and Recognition (SIRI) software, which allows to launch apps with voice.
It might also be useful to take into consideration radiation emitted by the cell phone – the phone must have an FCC certification. Deciding to purchase a digital camera it is necessary to determine the needs and distinguish them from wants in relation to the given budget. Then choose the number of megapixels the camera must have and whether it should have interchangeable lenses or a fixed lens. SLR (Single Lens Reflex) or DSLR is good to use with interchangeable lenses, while for fixed lens it is better to choose an auto focus lens.
Also choose between rechargeable batteries versus disposable ones and decide on the camera’s ability to capture video and voice, to transfer data via wireless connection. In any case, when choosing either piece of equipment mentioned above the first steps are determining budget and needs and reading the reviews of the items under consideration. EXERCISE 2: List the factors to consider when purchasing a laptop computer. Select 3 different laptops and structure a table comparing the 3 laptops.
Provide a summary of cnet. com reviews for these laptops. Which of the three laptop would you select? Why? 80 When choosing a laptop it is important to consider price, processor, memory, hard drive, graphics, operating system, dimensions, screen size and weight. Three budget category laptops have been chosen for the purpose of this exercise: Acer Timeline U M5-481TG 6814 Samsung Series 5 535 Dell Inspiron 13z Price $779 $849 $699 Processor 1.7GHz Intel Core i5-3317U 2.0GHz AMD Quad-Core A10-4655M 1.7GHz Intel Core i5-3317U Memory 4GB, 1,333MHz DDR3 4GB, 1,333MHz DDR3 6GB, 1333MHz DDR3 Hard drive 500GB, 5,400rpm + 20GB SSD hybrid 750GB 5,400rpm 500GB 5,400rpm Graphics Nvidia GeForce GT 640M LE (1GB) / Intel HD 4000 Radeon HD 7620G Intel HD4000 Dimensions 13.4x9.6 inches 13.1 x 9.0 inches 13.7 x 9.1 inches Screen size 14 inches 14.0 inches 13.3 inches System weight 4.2 pounds 4.0 pounds 3.8 On the basis of the presented above information it can be said that cheaper Dell has similar or better than Acer’s processor memory and hard drive characteristics.
However, Dell has smaller screen. Samsung, on contrast, is more expensive, but has better characteristics than Dell. So if choosing among the thee, it would probably be wiser to buy Dell since it is cheaper than similar Acer. Samsung, however, is the best option if the user, of course, needs those better characteristics.
However, the price is not much higher, so it might be reasonable to buy Samsung. Exercise 3: What cell phone do you have? Do you have a smartphone … if so run speedtest. net and list your speed and where you were when you tested the phone. (PING: 117ms, DOWNLOAD: 4.19 Mbps, UPLOAD: 1.24 Mbps) Use the chart on CNET. com to determine the battery life and also the radiation rate (SAR Rating) for your cell phone. I have IPhone 4S.
Speedtest. net showed: PING: 117ms, DOWNLOAD: 4.19 Mbps, UPLOAD: 1.24 Mbps According to SAR, talk time is 9.2 hours, radiation level is BCG-E2430A Exercise 4: Explain the difference between CDMA and GSM? Are you using CDMA or GSM? Why? GSM is Global System for Network communications. It is used by AT&T. Sprint and Verizon use Code Division Multiple Access – CDMA. It is a US standard and provides more coverage in the US.