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Spectrum's responsibility is only as far as its own equipment. I have had multiple service providers and none of them have ever accepted responsibility for anything beyond that.
Ethernet is not enabled on the set top boxes so the only way to internet connect your AV receiver is to hard wire to the router or access point or use wifi. I have a TiVo Mini hard wired to an Airport Express set up as an access point that works great.
There is no internet data modem output on the set-top box, just HDMI or composite AV outputs via RCA jacks. The RJ45 connector on the rear panel of your DVR or set-top box is used only for Spectrum's service access. If your receiver requires an internet connection you must connect it into your home data network.
Several regular contributors to this forum suggest using a pair of powerline extender modems for ethernet when a true cabled connection is not practical.
I was disappointed to hear the ethernet from the set top box was disabled. I have an extra router that I'll try to configure as a bridge. Thanks for your input
Those old routers laying around are still good for something.