bandwidth is the amount of data thatan be sent over a period of time, it is usually measured in bps
bps means bits per second
bandwidth can be used in many real life examples, eg a motorway: the wider the motorway gets, the more cars can go down it
bandwidth is very simple to understand, it just means the amount of data that can be sent over a period of time, and it is measured in bps, thats basically it (:
in chapter 7 i learnt about all the different types of printers, laser, inkjet, dot matrix and daisy wheel. the dot matrix and the daisy wheel are a bit outdated now, as the inkjet and laser printers have taken over, the inkjet is good home printer or good for small office as it is capable of printing 2- 8 pages per minuite, a good number for any home as you will not be printing that much.
laser printers are more for a large office or company, as they can print up to 200 pages per minuite, also the ink is cheaper than the inkjet and lasts longer, as less is used per print, as it is a dry solid ink, the printers fuse the ink onto the paper by using a complicated process that goes on in the machine every time you print. 
dot matrix printers and daisy wheel printers are a bit outdated, as they use a method of printing that is no longer very reliable, the have a ribbon, on which the ink is, they then use pins, if it is a dot matrix, a wheel with letters and numbers on if it is a daisy wheel to hammer the ribbon onto the paper, printing the letter that they want, these printers are very noisy and slow, that is why the laser and inkjet have taken over.
scanners:
there are 4 types of scanners, all in one, flatbed, handheld and drum, all of these scanners scan an image and just like the printers, a measurment of their quiality is measured in DPI (dots per inch) an all in one scanner combines the functionality of multiple devices, eg. scanner, copier, printer and fax, these are good for a home of small office as you have everything you need in one useful item, however they are not very quick.
faltbed scanners:
it is a flat scanner, often used to scan books for archiving, it is a usefull home or small office scanner, as it is small, portible, cheap to run and efficient.
handheld scanners:
handheld scanners are small scanners, even more portible than the flatbed, they are scanners you hold in your hand and carry around, hense the name handheld, they are commonly used in supermarckets, as they are very good at scanning barcodes. the scanner is on the head of the scanner, you pass it over a surface and it will scan it.
drum scanners:
drum scanners can scan a more detailed image, this is why they are good for museums, as they can scan delecate peices of artwork, without damaging it, it also scans a very high quality image, making the copy more like the original, however the drum scanner is slowly being replaced by the flatbed scanner as this also gives a high quality scan without damaging the item, but at a much lower cost, and ink costs less too.
while studying the chapter i felt that i have leart alot of valuable items, such as i found out that my home printer was a laser printer, as i felt the print and the ink was hot and dry, showing that it was dry ink, that has been fused to the paper, my overall view of the chapter has been that i have enjoyed it, i found the printers and scanners very interesting, not so much the instillation of them but the uses and facts about them.
based on this i could havetaken more intrest to the instillation of the printers and scanners, as then i would benefit more from more understanding of that practical, however, i now understand the instillation so all good (:
in chapter 8 i will continue to participate in class discussions and keep up to date with my work, as this will benefit me more in the IT essentials course.
step 1: install the printer’s drivers
step 2: plug the printer in to the computer and turn it on
step 3: the printer’s menu should come up, because it is a plug and play device, if not go to the start menu, control panel and then printers and scanners, once you have the printer’s menu, follow the steps and print a test page to check it is all in working order
after all this your printer should be in full working order, enjoy your new lexmark x3350 (:
there are two main printers, ink jet and laser, these are the two most modern types of printers, ink jet can do about 2-6 pages per min. printers are assesed on how good they are by their speed and capacity, this also affects how much they cost.
there are alson two other types of printers that work much in the same way as a typewriter, usin pins or letters to hammer the letters onto the page, they are called dot matrix printers and daisy wheel printers, ink jet printers work a bit like them, but they spray the ink, instead of hammering it on, laser printers fuse the DRY ink to the paper, allowing the ink, even when wet not to run.
laser printers are generally used in offices, as they can do about 3 pages per second, ink jet printers are more like a home printer, able to print about 2-6 pages per min, depending on wether they are in colour or not, if just in black and white then they can print it significantly quicker.
for a laser printer to print in colour, or any printer for that matter, they only use 4 colours: black, cyan, mangenta, yellow, all other colours are a mixture of these. laser printers are far cheaper overall than ink jets, as you do not have to keep paying for ink cartridges.
dot matrix printers are an old printing method, but still work quite well, they have little pin, which they re-arrange into the shapes of different letters, and hammer onto the page, the daisy wheel works mostly the same, but instead of pins it has the letters on a wheel, that resembles a daisy, this is how it gets its name, this has a drawback though, you cannot change the font, as the wheel has the letters already engraved, the dot matrix can re-arrange the pins, making different fonts, it is not as multi-functional as the ink jet and laser printers, but it still gets the job done.
We learned about troubleshooting (how to get rid of problems on your computer) You do this by gathering info from the customer to see what the problem is, try the quick and obvious solutions first see if that works, if not gather data from the computer see what is wrong so you are albe to fix the problem.
The first laptop was around £2,000, now that would be worth around half a million pounds, it was built in 1979. An average smartphone these days would cost around from £60 to £120. A desktop computer these days would cost around £600 and that would be with a keyboard monitor mouse and everything you need, but a laptop would cost around £300 and you would not need a mouse or keyboard because it is built in, in the form of a trackpad instead of a mouse.
docking stations: docking stations were what was used to charge a laptop, now being replaced by the power pack that you pug in to a socket, a docking station from a top view has a power button, an eject button and a docking station connector. from a back veiw it has an Exhaust vent, AC power connector, PC Card/ExpressCard slot, bVGA port ,DVI port, Line In connector, Headphone connector, USB port, Mouse port, Keyboard port, External-diskette-drive connector, Parallel port, Serial port, Modem port and the Ethernet port.
chapter 6 is all about laptops, smart phones and PDA’s
laptops are mainly used for people with an on the go lifestyle, allowing them to access information/ internet access at any place. the laptop has evolved greatly in the past few years, its main features are its size and weight, making it more portable than the typical desktop computer.
PDA’s and smart phones are portable hand held devices, they include touch screen mobile phones and pagers, these things must include a built in camera, note taking, document access, email and television to make them a smart phone or PDA.
laptops usually include and integrated display screen, a built in web cam, a track pad and a keyboard. laptops use a power pack or battery unit to operate, that is what makes them portible.
laptops use a clamshell design, making them flip open instead of staying open, making them even more portable, as they can fit into a bag and be carried around, this also means you can take them out and use them anywhere, smart phones are like this aswell, they give internet access from any location.
Fourth-generation, 4G, networks are based around the Long Term Evolution technology and downlink data speeds can hit 100 megabits per second – about ten times quicker than the fastest 3G networks.
we need 4G networks, as 3G networks are slower and have less megabits per second, the 4G networking generation will far surpass the 3rd generation, with faster broadband at almost any place.
the pros: faster broadband at almost anyplace.
the cons: nothing as far as i can see XD
it is realeased at some point in summer 2010
i think the 4G is a grat idea, as it is just expanding from the already succesfull 3G, giving it faster broadband from almost any place, and faster wiwfi connection
a desktop computer is intended for use in a fixed place, a laptop can be carried around or moved from place to place.
the motherboard is usually bigger in desktop computers, allowing it to have more internal components.
desktops have monitors, a base unit, a keyboard and a mouse, each one of these is a separate components, and are all linked together by a series of connectors/ wires
laptops have all of this built into one unit, a monitor, keyboard and mose, but on a keyboard to save space, a trackpad is used in replace.
