communication systems (other components)

Question 1

analog data

Answer 1

data that HUMANS can read e.g time, temperature, voice/sound and light. however, computers cannot understand such a form

27 degrees, 12:35pm (those are analog data)

-needs to be encoded to digital form for computers to understand

Question 2

digital data

Answer 2

Digital data is what COMPUTER SYSTEMS understand

-they only understand values in the form of 0s and 1s

arrangement of 0’s and 1’s when combined together can be used to represent different media types on a system, such as text, image, audio and video

digital data will need to be decoded in to an analog form if it is going to be understood by human beings.

Question 3

examples of digital data

Answer 3

-text and numeric symbols
-The image and frame data of a video file
-pixels
-Sample rates and sizes in a audio file

Question 4

outline of the three different sections of a data packet?

Answer 4

-trailer
-body
-header

Question 5

whats a header?

Answer 5

header contains the following information:
-Addressing information via IP addresses
-Packet length (being 16-bit packets)
Start and end frames (synchronisation of sender and receivers internal clocks)

-transmission protocol being used
-packet number is provided

Question 6

whats a body (in a data packet)

Answer 6

• bytes of data being transmitted
  -digital form of the message during data transmission

Question 7

Trailer

Answer 7

contains bits related to notifying a receiver that it is at the end of a packet

-states type of error detection uses (checksum, parity bits and cyclic redundancy correction)

-needs to conduct the relevant calculation to check it gets the same value in order to ensure data has been received correctly