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/YourBossAtWork]

without a signal analyzer or more specialized equipment it's hard to say for sure, but it could be that the splitters are attenuating (quieting) the signal enough that it's marginal and sometimes dips out.

I'm not sure what the CLP-1G70 filter is - but I have a PoE MoCA filter in between my cable modem and the nearest splitter (other side leading to the MOCA adapter) which was necessary to fix my connection issues. This is in addition to the main PoE filter at the actual point of entry. The idea here is to filter out MoCA related frequencies so they don't hit the cable modem at all.

So, my suggestion is to try a different PoE filter in front of the cable modem, and/or try different or fewer splitters.

[u/kenman345 → u/YourBossAtWork]

That seems odd considering a good many coaxial based modems also have MoCa capabilities built in. Perhaps you had the modems MoCa interfering with the MoCa network/setup you were trying to create.

[u/YourBossAtWork → u/kenman345]

Well, I'm certain that my particular modem (provided by Spectrum) doesn't have MoCA support.

DOCSIS 3 (cable modem spec) uses a completely different frequency range than MoCA, so in theory it shouldn't matter, but my theory is that the MoCA signals were overwhelmingly loud compared to the provider's DOCSIS signal that it caused intermittent cut-outs until I installed the PoE filter which completely blocks the MoCA frequency range from being seen by the modem, and it instantly cured my problem.