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Hi @pikesh8038
If you received the TP-Link Archer c1200, then your service might be under the NBN FTTP (Fibre to the Premises).
Any NBN compatible router will work with the type of technology you have.
Please make sure that you'll configure the third party router with PPPoE connection type and use your TPG username and password.
Let us know if you need further assistance.
BasilDV