Mr Cooper computing

Data transmission

Electrical Data Transmission | IGCSE Computer Science | Learnlearn.ukIntroduction to Electrical Data Transmission Research on how to use electrical currents to send data began in the early 1800s, however it wasn’t until 1844 that the first proper message was sent over electrical wires. Samuel Morse and associates successfully sent a message from Washington DC to Baltimore. The message was coded using Morse Code… Read More »Electrical Data Transmission

Optical Data Transmission | IGCSE Computer Science | Learnlearn.ukIntroduction to Optical Data Transmission Using light to transmit signals is nothing new. Signal fires and smoke signals have been used for thousands of years. Because light travels incredibly fast signals could be sent from place to place very quickly. Native Americans and other cultures used smoke signals and the Chinese signal tower system along… Read More »Optical Data Transmission

Radio Wave Data Transmission | IGCSE Computer Science | Learnlearn.ukWhat are radio waves? Radio and microwaves are electromagnetic waves on the long end of the electromagnetic spectrum. They were first discovered in 1886 by Heinrich Hertz and radio was first used commercially in 1900. Due to the issues around interference between radio users, radio transmission is highly regulated by laws all around the world… Read More »Radio Wave Data Transmission

Data Transmission | IGCSE Computer Science | Learnlearn.ukAn Introduction to Serial, Parallel, Simplex, Half Duplex & Full Duplex Transmission as covered inat GCSE / iGCSE Level Computer Science & ICT Courses.

Error Detection – Parity Bits, Check Digits & Check Sums | IGCSE Computer Science | Learnlearn.ukWhy do errors occur? When data is transferred through a network at each stage there is possibility that data might get corrupted. Therefore when a packet is received it needs to be checked to ensure the integrity of the data. Two common ways this can be achieved is through the use of parity bits and check-sums. Parity… Read More »Error Detection – Parity Bits, Check Digits & Check Sums

Automatic Repeat Requests (ARQs) | IGCSE Computer Science | Learnlearn.ukAutomatic Repeat Request Protocol This is a protocol for error control over unreliable or noisy network connections. For each frame sent an acknowledgement is sent from the receiver to indicate that the frame has been successfully used. Checksums / check-digits are used to check the data integrity and timeouts are used if not reply is… Read More »Automatic Repeat Requests (ARQs)

Internet & World Wide Web | IGCSE Computer Science | Learnlearn.ukThe Internet The internet is a massive interconnected collection of WANs and LANs). It is partly mesh and partly hierarchical in its setup. The is no agreed setup for the Internet, it has just grown organically. You can edit your own diagram of the internet and networks at https://www.draw.io/ Just choose New Diagram > Network and… Read More »Internet & World Wide Web

HTTP, HTML & CSS Protocols | IGCSE Computer Science | Learnlearn.ukHyper Text Transfer Protocol (Secure) The internet is a global network of interconnected computers. Only a small proportion of the data which is sent through the internet is web page data, or Hypertext. Examples of the different data which is sent across the internet incluldes: Wep page data (HTML, CSS, Javascript) Images Video Sound Network… Read More »HTTP, HTML & CSS Protocols

MAC Addresses, IP Addresses & URLs | IGCSE Computer Science | Learnlearn.ukMAC Addresses https://www.youtube.com/watch?v=UrG7RTWIJak&t=1sVideo can’t be loaded because JavaScript is disabled: What is a MAC Address? (https://www.youtube.com/watch?v=UrG7RTWIJak&t=1s) IP Addresses https://www.youtube.com/watch?v=7_-qWlvQQtYVideo can’t be loaded because JavaScript is disabled: IP addresses. Explained. (https://www.youtube.com/watch?v=7_-qWlvQQtY) Unique Resource Locators (AKA Web Address) An URL (aka web address) is the alpha-numerical address that humans type in to a web browser to access a… Read More »MAC Addresses, IP Addresses & URLs

Packet Switching - Computer Science: Cambridge International GCSEPacket switching is the process of breaking data down into packets, sending them across the Internet to another computer, and then re-assembling the data.

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