Anyhoo - I called TelstraClear's helpdesk this morning, and got straight through to a very capable Indian-accented guy, who verified that the line's ADSL connection wasn't working. The trouble is that he didn't know which end of the line had the problem. And if I call out a technician and he finds it's our problem, it will cost us a $200 fee. That acted as a pretty good incentive to test my end first.
He gave me the steps for testing the components in the chain, so armed with modem/router and power supply plus a phone cable, I tested each outlet, filter, and cable - still no ADSL light. Then we found our landlady Leanne's router and plugged it in - the ADSL light came on right away - bingo! It was our faulty modem-router, so we'll need a replacement. I've never liked D-Link gear anyway, their 56K modems used to be cranky too.
Off to Dick Smiths, where all the routers are now N-band Wifi and ADSL2/2+ compatible, costing around $170. Then I spotted one at $114, a unit that was intact and working fine, but the packaging had been opened then returned. Fair enough, I don't mind saving $50! So now we have a budget-priced Linksys (Cisco) router, looking like a black ashtray. We also have a new network SSID and password, and we have to re-authenticate phones, laptops (Mac and Linux), Android tablet, etc. How do non-IT people manage all this?
So we're back in the world - but is it the real world, or just cyberspace? Wherever we are, it was a pain being off the air. Let's hope this new unit lasts longer than the 6 months we got from the D-Link.