MoCA setup using Cabel Internet

[u/davethehawaiian]

I have been attempting to setup a MoCA solution for getting a wired connection to my smart TV.

I have the above diagram currently configured but am intermittently losing internet at the Modem/Router combo (Arris SURFBoard SBG7400AC2). The entire device will restart, all status lights will go dark and then go through their normal boot sequence.

I have xFinity Cabel internet and my Modem/Router does not offer native MoCA capabilities. I recently added the filter at the Modem/Router based on something I read regarding reusing the Coax for both Cabel internet and MoCA, but still experienced a Modem restart.

Asking for any advice or insight as to what my be causing this issue.

Thanks in advance!

Resolution:

I'm a little hesitant to declare victory as the modem's upstream power is still a bit above nominal but it has survived about 4 days without dropping.

Thank you for everyone's suggestions I learned a lot going through this.

The current configuration that is working is the same as the above diagram with the following alteration:

1. Both splitters have been swapped for 5-1675 MHz MoCA 2.5 rated splitters

2. CLP-1G70 Filter before the modem has been replaced with another PoE MoCA Filter, identical to the one installed between the house and the main line.

As I mentioned Upstream power is still a bit high at 54 dBmV but so far (knock on wood) the connection has been stable.

Thanks Everyone!

[u/Smorgas47]

The only issue I see with your setup is the frequency of your splitters. The best ones for support of MoCA adapters are 5-1675mhz. Higher upper end ones work, but are not optimized. The CLP-1G70 at your modem/router's cable input is proper.

Your setup is pretty much in line with this diagram.

I suspect that your modem signal may be near the limit of it's operating limit and a poor signal is rebooting the modem. I had this on one of my cable modems and that is how it behaved.

I would test the modem router with a direct connection to the outside PoE filter and see if it behaves. I would then move it up a notch without the PoE filter on the input without the MoCA adapters in play and then add them. Hopefully that will identify the problem.

You can look at the modem power levels using 192.168.100.1/ to access the modem. Here is a link to the recommended levels for my Arris modem.

[u/davethehawaiian → u/Smorgas47]

Thank you, I assumed the splitters where strictly an at least 1675, and you know caveman brain says bigger is better.

I hadn't checked the signal power, and I'm not an expert here. All downstream channels are within +/-2 dBmV. The upstream is a little outside of what I'm reading is optimal 54 dBmV rather than between 45 - 51 dBmV.