UNIT 8

Today we went over the diagrams from last lessons. We looked at a few peoples diagrams on their blog. We then looked at Serial and Parallel data transmission. the difference is: Serial - sending one row of bits in a line, individually. Example: USB. Internet. Parallel - sending 8 rows of bits in a line, all together. Example: Computer to Printer. Parallel is faster, but it gets problems and is out of sync.

Signal Directions:

Examples are: Simplex (type of communication that runs one way e.g. Radio), Half Duplex (type of communication that can run one way AT A TIME. for example, Walkie Talkie, as you cannot give a message while getting a message), Full Duplex (type of communication that runs both ways at the same time for example web-cam on msn, you can view both cameras communicating at the same time.
A) Simplex.
B) Half Duplex.
C) Full Duplex.

Synchronous Communication: Communication that is synchronized. Such as knowing that someone is about to send data and about to receive it. Example: Video call.
Asynchronous Communication: Has no set time for the data to be sent or received (page 186). Meaning the data will be sent at any time. for example; Sms, email.
Bandwidth: amount of data moving through a communication channel at the given time.
Broadband: has a high bandwidth.
Baud: is the number of distinct signal events or timing intervals in a second.