connectivity A.A 9G

underwater cables
1. used to communicate through water
2. lots of layers
3. fastest method of communication
bandwidth
1. how much data can be transfered
2. maximum rate of data transfer
3. not a measure of how fast data travels
broadband
1. transmission techique
2. allows a large number of messages to be communicated simultaneously
medium
1. wireless connection
  1. cons
    1. not as secure
    2. connection can be slower
    3. interference
      1. from walls
    4. limited distance
  2. pros
    1. cheaper installation
    2. can communicate faster between devices in businesses
    3. easily accessible from anywhere
  3. uses radio waves
  4. doesn't use cables
2. copper cable
  1. pros
  2. cons
3. fibre optic
  1. pros
    1. travels very fast
      1. travels at the speed of light
        299792458 m/s
      2. no buffering
    2. almost no interference
  2. cons
    1. very expensive to maintain
    2. expensive to install
    3. low power
    4. can't go over long distances
      1. requires repeaters
download speed
1. usually, the download speed is faster than the upload speed
2. at school the upload speed is faster than the download speed as many students are uploading their work
buffer
1. temporary storage space on a computer
2. used to store data whilst it is being moved
history
1. first cable was laid across the Atlantic
  1. in 1858
  2. total weight was 1 ton
  3. 2500 miles long

Resource summary

	Created by Emilia Ace almost 5 years ago

	Copied by Arthy Arudkumar almost 5 years ago