Legacy Portserver TS4’s (Digi part# 70001751) had a 3.3vdc supply. I think what you’ll want to do is return this to your distributor if you’ve had it under 30 days, and ask for Digi part# 70002045 instead, which is a Portserver TS4 w/9-30 vdc supply.
Sorry to hear about the troubles you’re having with supply out in Australia, but I’ve forwarded a link to this post to our Sales Rep in Hong Kong, so hopefully he can put you in touch with the right distributor to order your cables.