1. 1 Press Ctrl-A ©G Dear 2010 – Not to be sold/Free to use Calculating Download Time Stage 6 - Year 11 Applied Mathematic (Preliminary General 1)

2. 2 End of Slide Calculating Download Times Download is where data is received from another computer on the network by: 1. Modem (Very Slow) … 2. ADSL …………………… 3. Wireless ADSL………… 4. ADSL 2+ …………………… up to 56 kbit/s up to 1500 kbit/s up to 8 Mbit/s up to 20 Mbit/s

3. 3 End of Slide Calculating Download Times A standard definition 1 hour TV show is 350 megaabyte. 350,000,000 bytes Modem 56 kbits/s ÷ 8 = 7 kilobytes/s Download Time = 350,000,000 ÷ 7000 = 50,000 seconds÷ 3600 ≈ 14 hours

4. 4 End of Slide Calculating Download Times A standard definition 1 hour TV show is 350 megaabyte. 350,000,000 bytes ADSL 1500 kbits/s ÷ 8 = 187.5 kilobytes/s Download Time = 350,000,000 ÷ 187,500 = 1867 seconds÷ 60 ≈ 31 minutes

5. 5 End of Slide Calculating Download Times A standard definition 1 hour TV show is 350 megaabyte. 350,000,000 bytes Wireless ADSL 8 Mbits/s ÷ 8 = 1 megabyte/s Download Time = 350,000,000 ÷ 1,000,000 = 350 seconds÷ 60 ≈ 6 minutes

6. 6 End of Slide Calculating Download Times A standard definition 1 hour TV show is 350 megaabyte. 350,000,000 bytes ADSL 2+ 20 Mbits/s ÷ 8 = 2.5 Mbytes/s Download Time = 350,000,000 ÷ 2,500,000 = 140 seconds÷ 60 ≈ 2.3 minutes

7. 7 End of Show Calculating Download Times Speeds are generally much less. My download speed was 8534 kbits/s My ADSL 2+ @ home with TPG. 8534 kbits/s ÷ 8 = 1067 kbytes/s Download Time = 350,000,000 ÷ 1,067,000 = 328 seconds÷ 60 ≈ 5.5 minutes broadbandguide.com.au/broadband-speed-test