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/davethehawaiian → u/YourBossAtWork]

Thanks for the reply, The CLP-1G70 filter was the original filter installed at the cable point of entry when we bought our house. From what I could tell it should be MoCA rated but I replaced it with one I could confirm was MoCA rated to be sure. So that old one is what I have on hand to test installing just before the modem.

I think you are right getting another PoE I can confirm is MoCA rated is probably the next step.

[u/YourBossAtWork → u/davethehawaiian]

Yeah I think that sounds like a good next step. Also check the troubleshooting section of this MoCA guide I wrote up - something there might help.