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Module 1.3 Internet connection choices Theme: Let’s communicate

Module 1.3 Internet connection choices Theme: Let’s communicate

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Module 1.3 Internet connection choices

Theme:

Let’s communicate

Revision of Gr 10 and Gr 11 work

• What is the internet?

• Which type of data is sent over the internet?

• Name a few uses of the internet by the

– Home user

– Businesses

• What do we need for an internet connection for a home computer with a telephone connection?

Terminology

• Digital versus analogue signals

Terminology

• Band width (Kilobytes per second or Megabytes per second)

• Broadband

Terminology

• Dial-up line– Normal telephone line– Charged for length of time the call takes as well as the

distance of the call.

• Dedicated or leased line– 24 hour per day connection

– Do not need to connect as in dial-up line– Pay a fixed monthly cost according to bandwidth

Methods of connecting (cables)

• Dial-up / non permanent– Normal telephone line with modem

Methods of connecting (cables)

• Dial-up / non permanent– ISDN (Integrated Services Digital Networks)

• Digital, not analogue as in normal telephone line

• More expensive than normal telephone line• Faster than normal telephone line• Two lines (for making phone calls and for

internet connection)

Methods of connecting (cables)

• Permanent / dedicated / leased lines - ADSL

Download speed (from ISP to client, e.g. When you download something from the Internet).

Upload speed (from client to ISP, e.g. when sending an e-mail).

256 Kbps / 128 Kbps512 Kbps / 128 Kbps

1Mbps / 256 Kbps

Methods of connecting (cables)

• Permanent / dedicated / leased lines– Diginet

• Telkom’s dedicated lines for businesses• Expensive• More cost effective methods available these

days

Methods of connecting (wireless)

• Connection via cellular technology– 3G (GPRS, EDGE, HSDPA)

3G card

Methods of connecting (wireless)

• Connection via cellular technology– 3G versus dial-up and modem connection speed

3G

Dial-up and modem

Methods of connecting (wireless)

• Connection via radio technology– Sentech (MyWireless) and iBurst

• A modem must be installed on your computer• No phone connection necessary• Permanent , ‘always on’ connection to the

internet• Network coverage in large cities

Acti

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y

Activity 1 p 27Activity 1 p 27

1 CHECK IF YOU UNDERSTAND

CHECK IF YOU UNDERSTAND

Activity 2 p 27Activity 2 p 27

2A

cti

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y

What to consider when looking at broadband

• Cost

• Speed

• Limits for downloads (caps)

• Mobility

• Coverage / availability

APPLY

Activity 3 p 28Activity 3 p 28

3A

cti

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y

Places where people can connect to the Internet

• Cyber cafés

• Hot spots

• At home

• From business

• Anywhere

CHECKLIST

I can. . . .I can. . . .

4A

cti

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y