Thanks for your help. I bought some RJ12 to RJ12 4 core modular lead and that seems to be compatible. I just needed an extra 10m of cable lead so I could bring my TP-Link Archer VR1600v modum downstairs during hot weather where it is cooler. It tends to heat up when left on for a few days. But no problems yet. I'm on FTTN NBN and still getting 46Mbps even with the 20m lead. Let me know if this is OK. I will eventually get someone in to do the job more professionally, but this is OK for now.
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