i nternet t echnologies national 4/5 computing science

INTERNET TECHNOLOGIESNational 4/5 Computing Science

LESSON AIMS By the end of this lesson you will be able to:

Describe what an ISP is

Describe the difference between the WWW and the Internet

Discuss the technologies that are used by ISP’s to allow internet access

ISP

An ISP is an Internet Service Provider

They are a company which provide you ( the customer) with access to the internet.

You will be connecting to their servers which then allows you access

INTERNET AND WWW

The internet is a collection of computers ( and networks) that are connected together

The World Wide Web is hosted (stored) on the internet.

Is the web a good thing?

Can you imagine not having the web?

MY WEB IS SLOW…

You won’t always get the advertised maximum speed!

Factors such as: Time of Day Day of Week Your distance from your phone exchange How many people in your area

Will all effect your connection speed

WHAT DO WE USE THE INTERNET FOR?

Gaming

TV/VideoSocial Networking

Homework

Shopping

Banking

MAIN TECHNOLOGIES WE WILL LOOK AT

1. ADSL (Broadband)

2. Fibre Optic

3. Mobile Internet

UPLOADING AND DOWNLOADING

Can you think when you would be downloading from the web?

Likewise can you think when you would be uploading a file from your computer to the web?

Which are you more likely to do more often?

BROADBAND

The minimum service commitment for broadband is 2Mbps 2 Megabits per second download rate

With the upper limit of 24Mbps

This is usually achieved by using ADSL

ADSL

Asymmetric Digital Subscriber Line (ADSL) This means your download speed is usually much

higher than your download limits

ADSL works by the signal being transmitted down your phone line

Can still talk and surf at the same time

SUPERFAST BROADBAND

The EU defines superfast broadband as: “broadband services at an access (download)

speed of more than 24 Mbps”

This is usually achieved by using fibre optic networks.

FIBRE OPTIC NETWORKS

These cables are made up of glass and plastic, This allows data to move much faster than along

the copper wire used by ADSL broadband.

Fastest current rate is a download rate of 100Mbps (Nov 12)

Not available to everyone!

MOBILE INTERNET

Similar to the technology used in mobile phones

Uses the mobile (usually 3G) network to allow communication Will usually require a USB dongle

MOBILE INTERNET

Requires mobile network coverage

Download/upload speeds can be quite slow.

Can be expensive as we are becoming very data hungry!