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Actually I would argue with that definition of a modem. Once you go to light, you are not modulating anything any more. the Modulate Demodulate that the acronym stands for does not apply to optical services as it is meaning generating an analog waveform to represent a digital bitstream.
regards the OP and making a choice between NBN or ADSL. By my understanding you won't get that choice, if NBN is switched on then there is generally a "Cease sale" applied and carriers are not allowed to sell new DSL or other similar services. It has caused a lot of grief in the HFC areas in the past when people were moving to NBN services as the old service they had would be cut off, the NBN install would fail for one reason or another and the "cease sale" regs meant they could not even get their old service re activated. That at least has been largely resolved now, but as far as I know they still cant sell you a new non NBN service.
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