Arris Touchstone CM820A/NA Cable Modem: Does it Have a Built-In MoCA® Immunity/POE Filter? I have a question regarding my Arris Touchstone Cable Modem (Model # CM820A/NA), and can’t find any related information here or elsewhere online. I installed MoCA adapters into my home network to replace the powerline network adapters that stopped working. While preparing to install the MoCA adapters, I read that it's recommended to install a POE filter at the cable service entry point to help block interference from nearby homes. I also read that some cable modems have these filters built-in, so I'm trying to determine if mine does. I read somewhere that the CM820A modem has a built-in MoCA® Immunity Filter. Unfortunately, the online specifications for the CM820A/NA don't mention the filter, so I'm not sure if it has one. I can't find anything describing the differences between the CM820A and the CM820A/NA, so I can't tell if my CM820A/NA has one of these filters built-in. I'm also not sure if the CM820A and th