Fair warning, setting up and managing a DSLAM is an undertaking, and additionally everyone that wanted to use it would need a compatible modem as well.
Source: I've setup and managed two such environments back in the day at an ISP, and also a couple of older VDSL setups in apartment blocks. It's a good way of getting some extra mileage out of old wiring but its expensive, creates another SPOF, and requires at least some knowledge. It can also be a giant PITA to troubleshoot, and all your wiring becomes far more precious when it comes to water/damp and interference.
Source: I've setup and managed two such environments back in the day at an ISP, and also a couple of older VDSL setups in apartment blocks. It's a good way of getting some extra mileage out of old wiring but its expensive, creates another SPOF, and requires at least some knowledge. It can also be a giant PITA to troubleshoot, and all your wiring becomes far more precious when it comes to water/damp and interference.