1. Internet Technologies
National 4/5 Computing Science

2. 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

3. 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

4. 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.

5. Is the web a good thing?
Can you imagine
not having the web?

6. 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

7. What do we use the internet for?
Gaming
Homework
Shopping
What do we use the internet for?
Banking
Social
Networking
TV/Video

8. Main Technologies we will look at
ADSL (Broadband)
Fibre Optic
Mobile Internet

9. 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?

10. 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

11. 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

12. 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.

13. 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!

14. 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

15. Mobile Internet Requires mobile network coverage
Download/upload speeds can be quite slow.
Can be expensive as we are becoming very data hungry!