How to distribute 1 twisted pair cable to 2 routers?

Question

network hardware

Hello! The problem is this: there is a TTK provider. I have a contract with him. It is necessary to connect the neighboring apartment to the Internet, BUT THROUGH MY!!! I do not quite understand how the network is built. Here are 2 schemes, which one should be used? It is the first scheme that is of interest, because. I have completed the repair and there is no way to stretch the second twisted pair from my router back through the corridor to the neighbors.
PS: Repeaters do not break through the wall of the corridor.
Powerline adapters didn't help.
A twisted pair has only 4 wires.
Thanks in advance for your replies.

Answer 1

And why such difficulties. We take the second scheme, on the second router we simply disable dhcp and ip addresses will come from the first router.

Answer 2

If the provider allows you to hang two devices per port, then there should be no problems with the first scheme.

Answer 3

I wonder how it happened that the apartment entry was made with a 2-pair cable? The marginal savings of the provider, or what? If this cable were 4-pair, it would not be difficult to bring the line to a neighbor according to scheme 2, absolutely not affecting your entire repair:
1. Open the insulation near the end of the cable, separate the blue and brown pairs, cut them closer to the RJ45 connector and crimp these pairs to another RJ54, using the order 1 - BS, 2 - C, 3 - BK, 6 - K. Plug this connector into the LAN.
2. On the landing, outside your apartment, again cut the insulation of this cable, again separate the blue and brown pairs and cut them. On the part of the provider, you simply leave them alone, and on the part of your apartment, build up the cut ends with a piece of cable while preserving the colors. I usually do this by soldering, trying to maintain the pitch and twist density of the twisted pair - then the line will retain its impedance and will not even notice the splice.
3. Lead the soldered piece of cable to the neighbor's second router, configured as an AP, and crimp the third RJ45 there, using the same order as in step 1.
If a 2-pair cable is fundamentally indispensable for a 4-pair cable, then it remains to throw the second cable under the skirting boards - modern skirting boards, as a rule, are equipped with cable channels, and they will perfectly mask even drilling in the wall.