• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  • Level: GCSE
  • Subject: ICT
  • Word count: 1829

Introductory Communications and Input Output Devices

Extracts from this document...


Modem and Digital & Analogue Data Ordinary telephone lines can transmit sound signals because they are designed for speech. These signals are in analogue form. To transmit digital data into analogue data, it must be converted so when the analogue data reaches the end of the telephone line it must be converted back to digital format for a computer to accept it. A device called a MODEM (Modulator Demodulator) does this. Differences Analogue and digital data is very different. Digital lines are a lot more expensive to install and use compared to normal telephone lines. Modems must be purchased for use with normal telephone lines. Digital lines have a much higher bandwidth so the transmission rate for information is much quicker. Advantages & Disadvantages There are many advantages of using common networks, such as the internet, but there are also disadvantages. Local networks can mean that software and data can be shared, and all the users can communicate with one another. However, the installation software can be quite high and there is an extra task making sure that shared resources are safe and secure. The network can fail and cause chaos, or it could operate slowly if a lot of users are logged on. User IDs and Passwords When using a networked computer, it is important that we can only access data that is ours or that is shared. ...read more.


Mouse balls need to be cleaned regularly to make the mouse function properly. Joystick Scanner Moves a pointer on the screen. This is often used in computer games. There is an easy feel of direction due to the movement of the stick. More arm and wrist movement is required to use the joystick and so some people find it difficult. Joysticks are not robust enough and do break easily when playing games. Digital Camera Input Taking photographs to be put on the computer to be edited printed used in documents and presentation and to be posted on the internet. No film is required so therefore there are no developing costs. You can edit the image the way you want it (e.g. bigger, smaller etc). Digital cameras are a lot more expensive than normal ones. When they are full they most be loaded to a computer or deleted before the camera can be used again. Scanner Input This is another way of inputting still images. A scanner can be used to publish magazines and newspapers. Any image can be transferred from paper to a document, and then may be stored in documents and can be posted on the Internet. Images can take up a lot of memory space. Device Input/Output Uses Advantages Disadvantages Remote Control Input Can be used to input data from a distance. ...read more.


Dot-Matrix Printers Output These are ideal when carbon copies are needed. This is because they are impact printers, so the head bangs onto the top of the paper; the carbon paper transfers a copy to the paper beneath the carbon paper. They are often used for invoices and delivery notes. They produce carbon copies unlike laser and ink-jet printers. It is very cheap and reliable. The running costs are low as are the printouts. These are very noisy, slow and they produce very poor quality output. Plotter Output Often used for building plans, graphs and 3-D drawings. Also, they are used for engineers who are building bridges, machines, etc. Drawings are of the same quality as experts. Larger paper sizes can be used. Plotters are slow as they draw each line separately. Drawings are high quality but it is not suitable for text. They re a lot more expensive than printers. Normal plotters have a limit to the amount of detail they ca produce, but there are high-density drawings for things like a circuit board. Speakers Output A program that produces sound needs a headphone or speakers to be heard. For example a program that teaches a foreign language needs a speaker to playback. Everyone around can hear the sound from the speaker, so it is useful for a presentation that needs to be heard. The output can disturb others. High quality external speakers are expensive. Device Input/Output Uses Advantages Disadvantages Control Devices (lights, buzzers, robotic arms, motors) Input ?? ?? ?? ?? Introductory Communications ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Communications section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Communications essays

  1. special needs

    MS word is extremely needed by her because information passed on by her colleagues may need to be word processed and sent of to different organisations. Thus, she receives information from colleagues which requires word processing using the relevant software.

  2. Comparing documents

    JJPC's logo is orange, Wessex Waters is blue and Coffee Controls is Turquoise and white. JJPC has used their house style, whereas Coffee Control has not used their house style, yet, Wessex Water has not got a house style. JJPC's title is "Company Memo", it is bold and centre aligned.

  1. Digital communications

    A search engine Most browsers provide a search engine facility. The user enters text into the search engine box and the search engine will scan the internet for other web pages containing the text that the user has entered. Most search engines use a spider or a web crawler.

  2. OCR GCSE Business & Communication Task 7 Report

    Eye strain is another problem as staring at the glare of VDU (Visual Display Unit) from the computer screen can cause damage to the eyes when staring for a long amount of time. Stress can also be a big problem due to multiple hours, viruses and computer malfunctions.

  1. Ict ocr unit 8 ao1

    Some people who have their own router, sometimes have the problem of others hacking into their networks and using it to connect to the internet, however if the people know how, a password can be applied to a network so when people want to connect to it they must enter the correct password.

  2. ICT Systems in Everyday Life: Your Local Community

    However, there are so many other uses. It can be used for monitoring traffic. It is used in sports stadiums to focus on the audience. It can be hidden in train and buses to detect vandalism. It can be used to monitor animals in a zoo.

  1. How technolgy effects a disabled person

    * He can use visual scripting for complex situations. These are the system requirements that he needs to use the LookOUT screen reader. * A modern multimedia PC or laptop (At least 350MHz and 64 MB RAM). * Any sound card and a low-end video card. * Windows XP, 98, ME, 2000 or NT with service pack 6 Advantages

  2. Unit 23: Investigating Communications and Networks

    Advantages of a Star Topology * Easy to install and wire. * No disruptions to the network then connecting or removing devices. * Easy to detect faults and to remove parts. * If a cable fails only one user will be affected.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work