Communication Channels

Communication Channels

1. Data packet

   • The Header contains the preamble, sender, and receiver. It also contains a Deliminator to synchronise timings.
   • The Payload contains the actual data.
   • The footer contains the error corrections. This performs a calculation of what’s in the data packet this is stored in the footer. When he data packets are received the header contains information which will then perform a calculation a with the values match then it is fine, if not a resend request is sent.

2. Flow of signal

   • Simplex allows data to travel only one way.
   • Half Duplex must be used in both directions. Data can only flow i one direction at one time.
   • Full Duplex Allows data to move in both directions at the same time.
   • Point to point is a direct transmission between two systems.
   • Multi Drop allows communications to take place between one computer and several systems.