connectivity

connectivity

1. underwater cables

   • used to communicate through water
   • lots of layers
   • fastest method of communication

2. bandwidth

   • how much data can be transfered
   • maximum rate of data transfer
   • not a measure of how fast data travels

3. broadband

   • transmission techique
   • allows a large number of messages to be communicated simultaneously

4. medium

   • wireless connection
     • cons
       • not as secure
       • connection can be slower
       • interference
         • from walls
       • limited distance
     • pros
       • cheaper installation
       • can communicate faster between devices in businesses
       • easily accessible from anywhere
     • uses radio waves
     • doesn't use cables
   • copper cable
     • pros
     • cons
   • fibre optic
     • pros
       • travels very fast
         • travels at the speed of light
           • 299792458 m/s
         • no buffering
       • almost no interference
     • cons
       • very expensive to maintain
       • expensive to install
       • low power
       • can't go over long distances
         • requires repeaters

5. download speed

   • usually, the download speed is faster than the upload speed
   • at school the upload speed is faster than the download speed as many students are uploading their work

6. buffer

   • temporary storage space on a computer
   • used to store data whilst it is being moved

7. history

   • first cable was laid across the Atlantic
     • in 1858
     • total weight was 1 ton
     • 2500 miles long