The Neural Network makes use of various carrier networks around the country to deliver "Last Mile" services. This includes Telstra, iiNet, AAPT, NBNco and others. The "Carrier DSLAM" field on the ADSL ordering screen shows which carriers DSLAM will be used to deliver this connection.
Regardless of which Carrier DSLAM is used, your connection still terminates into the Neural Network in the same way. Carriers are chosen based on availability in different areas.