Connectivity

Connectivity

1. undersea internet cables

   • in the ocean
     • made of fibre optics
       • glass cables
       • plastic tube covered in gel
       • includes lots of repeaters
         • disadvantages of fibre optic cables:
           • can only be placed on the ground - cannot leave the ground
             • Light emitting resources are limited to low power
           • they are quite expensive
             • they are good because there is less friction
               • less interferance
                 • data moves at the speed of light
                   • very good for transmission
           • they are very expensive
           • it is also very expensive to store
       • gold is a good conductor
     • usually near the coast
     • very hard to plant in the ocean
   • can be damaged
     • can be attacked by wildlife
     • disadvantage of copper cables:
       • corrosion
       • however- not that expensive
         • average broadband speed
           • connection is average
             • not everything will be as fast as fibre optics

2. bandwidth

   • the amount of data that can be carried at a time
   • e.g
     • amount of water that is carried by a pipe at a time
       • depends on the size of the pipe
       • transmitted in fixed amount of time
   • measured in bit per second
     • mbps
   • there are the most connections in:
     • america - europe
     • america - china
     • most businesses in the area
       • businesses require more connections than other affiliations

3. download speed is the speed at which information travels from the internet onto your device

   • receiving an email
     • 8 bits in a byte
       • how to calculate download speed
         • File Size In Megabytes / (Download Speed In Megabits / 8) = Time In Seconds.
       • MB = megabyte
       • Mb = megabit
   • broadband
     • high data rate connection to the internet
   • connection speed
     • speed in which the data is transferred
       • speed of light:
         • 300 000 000 m/s
           • 300 000 km/s

4. meanings:

5. wireless

   • can make connections without cables
     • allows to link devices
       • you can access everything wherever you are
         • can access internet anywhere
           • limited length to which connection is possible
             • it can be very slow
               • connection can be out of sync with the data
         • its less secure to transfer data then using cables
           • there is more interferance

6. Buffering

   • streaming
     • when the data of the movie is not saved
       • (or whatever you are streaming)
         • data is picked up
   • linked to streaming
     • when some of the unsaved data hasn't arrived at the device yet
       • it loads until the piece of data has arrived
     • does not have all the data it needs