ADSL Speed Testing

Download/upload test: http://www.ozspeedtest.com/

Distance from Exchange:

1. Use http://www.adsl2exchanges.com.au/ to find your exchange
2. Use Google Maps to compute the approximate distance to your house
3. Use http://www.internode.on.net/residential/internet/home_adsl/extreme/ to convert distance to theoretical speed (under ideal conditions).

Downstream Attenuation:

1. Find the "Downstream Attenuation (dB)" figure from your modem's stats page.
2. divide it by 13.81
3. Use http://fremnet.net/article/216/adsl-theoretical-speed-calculator or the excel spreadsheet on which it is based.

All of the above is approximate & theoretical, and only reflects the performance between your house and the exchange you are connected to. The network performance beyond your exchange, and the performance of the sites you are visiting is another story entirely.