Router Wifi not working when connected with GPON ONU

[Manavp]

I recently bought a new fiber connection from Trunet . The ISP installed a GPON ONU device.
That GPON device was connected to my personal router. (
Now the issue which i am facing -

The router works well when i use it through LAN Port, but will not transmit wireless wifi network when connected to gpon device.
Even if it connects, it connects with only one device and wifi keeps getting disconnected.

Though router works perfectly well if i don't connect to the gpon device. But then i don't have internet.

ISP is unable to help me with my routers. He says routers are the issue, but I have two routers, both are causing the same issue.

Any network expert here kindly help.

 

[havoc]

Probably some interference issue. Disconnect the ONU then try connecting to wifi. Also try turning off the ONU then try connecting it. Also try disconnecting the optical cable then try to use the Wifi. It will help us understand what's causing it.

 

[JB701]

the ip of the onu and the router is different right?

 

[itachi]

First, name the ONT and your router and the ip address you use for both

 

[Manavp]

How to check the IP on the ONU and the Router ?
ISP technicians have installed their router..wifi works on that router but not working on both my TP-Link and D-Link router.

 

[JB701]

type "ipconfig" in windows cmd and go to the default gateway IP on your browser. change the lan address to 192.168.47.1 so it doesn't conflict with the ONU

 

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[Manavp]

Internet on wifi works perfectly well i connect TP-Link WR940N Router.
But does not work when connected to either Tplink 840N or D-Link Dir615.
Wifi connects to only one device and keeps getting disconnected every 1-2 second.