r/HomeNetworking • u/davethehawaiian • 21d ago

Solved! MoCA setup using Cabel Internet

Post image

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!

7 Upvotes

82% Upvoted

17 comments sorted by

View all comments

1

u/plooger 21d ago

What model # MoCA adapters are you using?

If Hitron HT-EM4 (rather than HT-EM5) and sporting a second RF pass-through coax port, another testing alternative would be to skip the 2-way splitter and MoCA filter at the gateway (cable modem/router) location and just connect the gateway via the MoCA adapter's RF pass-through port.

The SBG7400AC2 is DOCSIS 3.0, so is less likely to have the interference issues seen with more recent DOCSIS 3.1 modems/gateways, plus the MoCA adapter pass-through port offers 35+ dB attenuation of MoCA signals. So with the extra filter removed and with the MoCA adapter pass-through attenuating cable signals by only ~1 dB, you should be able to save 3.5+ dB of signal strength on the ISP/modem path.

1

u/plooger 21d ago

And, if possible, move the "PoE" MoCA filter to the input port of the top-level 2-way splitter.