Can I possibly make a system to test out VDSL modems with openwrt router?

I have an Openwrt router, I also have some VDSL modems, but no VDSL line here. So I bought a Planet VC231G ethernet to VDSL converter device, hoping I can send DSL signal to them. I get a DSL signal with this, on their interface, I see 99999 download speed, which is actually the max I think. But no internet though. I want to make VDSL modem access to internet via the VDSL cable. The VDSL modem connects to the internet normally with PPPOE VLAN ID 35, how do I make it happen? Do I have to install PPPOE server on openwrt router?
As far as I know I did it like this: Openwrt router is connected to the Planet VC231G via LAN port. Then from VC231G's DSL, it goes straight to the modem's DSL port.
This is a very complicated topic I know, I've researched some but this device's like a top secret. Dunno what to do.

You can run a PPPoE server on VLAN ID 35, e.g.https://openwrt.org/user/ahorner/pppoe_server_guide

Or you can configure a DHCP server o. Your router and put your modem in bridge mode. This avoids PPPoE and VLANs.

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First you have to use their builtin web interface to configure connection parameters and get VDSL up, like connecting your PC where routers WAN port would go.

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Deepseek AI also said that, but I set 192.168.1.2 as IP, then tried to connect to 192.168.1.1 from PC. couldn't see anything. I thought AI was making things up. What's it's IP address really?

I've been trying to do that but what's this thing's ip address? I don't think it has one, instead it has 4 on/off switches on the back panel of it. I think they do that job.

Somewhere on the sticker? OEM guide? Disconnect phone line?

Planet VC-231G does not have a WEB interface. It is a simple device configured with a few dip switches. On a router with OpenWRT, simply remove PPPoE and VLAN on the WAN(VDSL2) port to get a connection through the converter.

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I have read that your modems do not support OpenWRT. In this case, you really need to configure PPPoE server and VLAN on the router connected to the LAN interface of the converter.

The user manual explains the four DIP switches on page 12 and 13. The setup of a PTP link is on page 14. Your new VDSL bridge is the CO and your existing modem the CPE.

Do you want to connect two networks over a telephone wire? Then I would try to put your modem into bridge mode without PPPoE.

Do you want to simulate a specific ISP then put a PPPoE server on VLAN 35 on the CO end.

This is what I want to do. I've got a Fiber optic line. But no VDSL. And I got some VDSL modems. I want to test those to see if these work. Because they're rather older ones.

I can see on the VDSL modem's interfaces's, it can reach up to 99999 speed, which is probably the max of them. But no internet connection. Due to not properly configured.

I want them as if they really are attached to a VDSL cable, like exactly the same setting. So I can truly stress test them. Thanks all I'll try to suggestions. I just couldn't understand the switches much. Here they are:

So I also made a totology of all possible outcomes. There is 16 different variations possible, only 4 of them got the DSL line lighting up, which they are:
From left to right Mode, tran, band and snr. But 1 means off, 0 means on in this case. I tested it like that.
|1|0|0|0|
|1|0|0|1|
|1|1|0|0|
|1|1|0|1|

The VDSL modem connects to the internet normally with PPPOE VLAN ID 35, how do I make it happen?

You'd need a working openwrt router/machine and then you'd need to set up a pppoe server. The openwrt machine would connect to the net I assume then share the connection on through to clients that connect via pppoe.

Seems pretty steep for a full novice. Maybe start with getting up that openwrt machine loaded up with all the needed software. See dekarl's post for the first link that's probably relevant.

I have things I don't understand. For example, my router's ip is 192.168.5.1 So then this line will be arond that range?:
option localip 192.168.2.1
option firstremoteip 192.168.2.2
Because when set to DHCP(mind you that not all my modems support DHCP on DSL interface) on Zyxel P-2812 Openwrt VDSL modem, then it gets an 192.168.5.x IP, but on DHCP. Does PPPOE work the similiar way?

Also where do we set username and password for the VDSL modem to send in? I didn't quite understand. Is there a very detailed video about this?