4.2 Data Transmisson

Question 1

Bandwidth

Answer 1

A measure of how much data can fit ont a transmission medium at one time, not a measure of speed

Essentially a 1Mbit/s connection means every second, 1 Mbit is passed down the cable (or any other transmission medium)

Question 2

Bit Rate

Answer 2

Describes the data requirments of an application over time. High bit rate means large amount of data needs to be sent in a short time

Question 3

The Internet

Answer 3

A world wide communications infrastructure made up of networks. These networks use TCP/IP and are connected using hardware (routers, bridges, gateways) and connection mediums (like fibre optic cable).

The WWW is not the same as the internet. The WWW is the information sharing, hyperlink technology and the internet is the connection technology.

Question 4

Low/High bit rate applications

Answer 4

Sending a text based email - low bit rate - emails tend to be few KB in size

Streaming video conference - high bit rate - vide sends a lot of data per second depending on quality

FIle server - high bit rate - lots of request for files and processing them fast, higher bit rate means less time to send each file

Browsing the web - low bit rate - webpages tend to be small, data is sent out over a period of time