Extended Network From NVR To Cable Modem?

Have come across an issue regarding a cable network to a residence. The main modem is on the third floor of a residence and a NVR is in the basement area. It is very difficult to run any type of wire to the third floor of this residence. I have tried power line adapters, wireless network works, with no success to connect NVR to the LAN. There is a coaxial splitter in the basement near the...

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