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The modem was supplied as part of a package deal by the ISP (Bigpond), so it looks as though we are out of luck unless we cough up for one of the models listed on that link, or unless we can just get the 'gateway' mentioned as part of the DW4020 model and combine it with the existing two (TX/RX) modems.

The gateway is probably a small PC of some kind. If you can pick up a cheap PC somewhere then you could just use that instead?