Have you confirmed there is no known outage in your area? Best to check this link first: https://www.optus.com.au/shop/support/answer/how-to-check-network-status-outages?requestType=NormalR...
If there isn't an outage listed, I'd recommend getting in touch with Optus Technical support via phone or live chat (http://yesopt.us/chat2us).
Let me know how you go! We're here to help 🙂
There is no reported outage in the area, but the dsl stopped connecting suddenly last week. I don’t have anything attached that needs a filter, and I use a ADSL connection. I might contact tech support sometime soon.