You can check to see if Telstra can provide you with 4 wire SHDSL for a top speed of 4M/4M or you may be able to get bonded adsl which is similar to what you have at the moment, except that they do the bonding of the adsl for you and you get to treat the connection as a Ethernet service. Failing that you will probably need to look at fibre, frame, ATM etc, which will not be cheap. However that said, the SHDSL option and bonded options wont be cheap with Telstra either.
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