Hi all, I have subscribed to Celcom Home Fibre 30 Mbps that tapped into Unifi infrastructure. They gave me devices as below:

Modem
ZTE GPON ONT
Model : ZXHN F620
Router
Shenzen Skyworth
RN685

I replaced the router with my previous TP LINK Archer C1200

I connect to the router by using T9UH wireless adapter. Wondering how do I know whether my router is the main problem or is their modem or fibre connection have problem?

My google meeting keep spike to 300-400ms and average at 30-40ms which is normal for my place as I live in East Malaysia.

Thanks everyone in advanced