It's definitely closed. That's the first time I've ever heard of "PAPL", though.
A quick search brings up a PDF of a contract with NSW RMS (formerly RTA). I wonder if that's supposed to be public.
Looks like it was a slow, dedicated link to the exchange, still in use right up to 2009. Ah, Australian Internet.
http://mailman.anu.edu.au/pipermail/link/1998-September/0352... has all the good sauce on papl
I worked at an isp which serviced their CBR office with a 128k isdn then upgraded to a "2 mbit" PAPL link (a niche product where you used 2 or 4 pairs of directly connected copper which bypassed the exchange).