How to make a DSL modem router, a regular router?

Question

linux

Hello. There is a modem router Sagecom (Fast 3184). The Internet comes via coxial. The modem is weak, the settings are at least, Wi-Fi distributes very badly.
There is a DSL modem router tp-link AC 1200. Attempts to distribute the Internet with Sagecom via Tp-link were unsuccessful. I tried to switch in Sagecom to Bridge (Bridge), from it with an RJ-45 cable to Tp-link (Wan port). In tp-link, network mode settings chose bridge mode with different options (with dhcp server and dhcp re-transmission).
As a result, Tp-link does not receive the Internet.
I would be grateful for any ideas, advice

Answer 1

Something incomprehensible movements.
Let's do this: let's leave Sagecom as it is, plug a twisted pair cable with an Internet from it into the TP-Link WAN port and make it a router that we will distribute WiFi. That is, he will have his own DHCP, his own WiFi, his own cable clients.

Answer 2

The Internet comes via coxial.

I do not believe it - now coaxial is practically not used anywhere in networks. Maybe you're talking about twisted pair?

How to make a DSL modem router, a regular router?

No way. Is it possible to change the firmware, but this is unlikely on such hardware.

Answer 3

Well, maybe in Russia they don’t use it, but in Israel it’s like that. There are three lines (coax, telephone network, optics), 70% use coax