Ok, adding another 2 port MoCA splitter at the modems location will drop the OFDM signal range down to -5 to -6 dBmV. Thats the very bottom of the range that I would like to see. Ideally you would be at a higher signal range to start with, but, it is what it is. You have room on the upstream side for the signal levels to rise, so, that shouldn't be an issue. My main concern at this point is the Downstream signal levels.
So, at this point, its a try it and see. You could simply buy or order the 2 port MoCA splitter, install that and not worry about the MoCA adapter side of the splitter for now. The question at hand is whether or not the modem will have problems with the additional 3.5 dB drop in signal levels reaching the modem? Ideally the open side of the splitter would have a 75 ohm terminator installed to prevent any signal reflection, or, a connection to some 75 ohm input to a device that happens to be turned off. I wouldn't sweat the small stuff for now.
I don't think you have to change anything at this point, in terms of the physical configuration, other than adding the 2 port splitter as an experiment. One thing to consider is that it will drop the MoCA signal levels as well, so that might result in slower data rates over the MoCA network. That's another experimental issue to be determined.
I don't know if the XB8 has a MoCA Privacy code entry window, or, if Comcast has simply used the same user interface. I'll have to look around to see what I can find.
Just to note, you have some amount of uncorrectable errors in the 700 to 717 Mhz range. I'm wondering if thats due to cell phone signal ingress somewhere in the system? Don't know, just wondering at this point. The amount of uncorrectable codewords is small compared to the total number of codewords in that same range, so, I'm not really concerned with them at this point.
Food for thought, I'll have to read thru the entire thread, I'm wondering what cable you have that runs to the modem from the outside cable duct? And by that I mean is it RG-59 or RG-6. It should be RG-6 which is a larger cable with lower losses at higher frequencies. I might ask you to check the cable jacket for the manufacturers data. That would show what type of cable it is. If its old RG-59, it should be replaced with RG-6, which would hopefully bring up all of your downstream signal levels. That would help to counteract the addition of the 2 port MoCA splitter just ahead of the modem.
Just to confirm, you should have the following configuration for your cabling:
Inbound -> MoCA -> MoCA -> cable -> Modem -> ethernet -> devices
Rogers Point of Splitter -> cable -> MoCA Adapter upstairs -> router -> devices
Cable Entry -> cable -> MoCA Adapter -> devices
Filter -> cable -> MoCA Adapter -> devices
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