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In "TPG Fibre To The Building (TPG FTTB) Setup Guide"
in the diagram (fttb_diagram_2.jpg) showing cabling if NTU is used, cable 5 from PC is shown connecting to the blue WAN port instead of a yellow LAN port. The text of point 5 under the diagram is correct.
Thank you for raising this @david64 .
We'll update the diagram as soon as possible.