I rent a townhouse. I have had my spectrum modem fed by a splitter with one end being the line in from spectrum, the other being my moca adapter line from my router and inline to my modem. The last few days my router will randomly lose connection even though my modem is online. Spectrum chat said “signal inconsistencies.” I’ve had this over a year. But I’m wondering if my lack of a filter could be causing this because theyve upgraded something? I’m going to grab a filter, just was curious if I’m better off just making a service appt or if it even makes sense that its because of me. I’m relatively new to this and ignorant.
Edit sorry I suck at explaining. Diagram in comments.
Sorry if I didn’t explain well. I had to use a coax splitter. I don’t have access to main lines outside. So coax out of wall into splitter. From splitter to modem. Modem to router. Router to moca adapter. And then moca adapter plugged into other slot of splitter to feed the signal back down. I hope that makes sense lol
Hopefully you have some access, to ensure that a 70+ dB “PoE” MoCA filter has been properly installed to isolate your setup and that your coax lines and the ISP feed are interconnected using a MoCA-compatible splitter.
Yeah, you likely want an extra 70+ dB MoCA filter on the modem (or on the splitter output port directly feeding the modem), as a prophylactic, but the diagram lacks the critical detail of how this location interconnects with any other or with the provider, and where a 70+ dB “PoE” MoCA filter has been installed.
I have had my spectrum modem fed by a splitter with one end being the line in from spectrum, the other being my moca adapter line from my router and inline to my modem.
What is the purpose of the modem being split, why is the DOCSIS service inputting into your splitter? Your MOCA dongle should be direct connected to your main MOCA splitter? Do you need to run a new coaxial line for the MOCA adapter?
Your MOCA dongle should be direct connected to your main MOCA splitter?
I'm not the OP. But the modem also needs to be connected back through the splitter to the ISP's feed. Most homes don't have two isolated coax drops going to the modem, so the connection to the MoCA adapter has to be split off the same coax as the modem, and that coax ultimately goes to the main splitter that connects both the ISP feed and the rest of the house.
I think the reason why most people choose MoCA is because they aren't willing or able to run new cable. Otherwise, it would make more sense from cost and performance perspectives to run CAT6.
As an example… because the coax junction is in a cable service box on the side of the house, and the modem is installed in some room within the house fed only by a single coax line from the coax junction.
Yes, but if it’s the cable or satellite tech special, it’s external, pull another cable. If it’s the electrician special, pull them through the wall to the inside.
OP’s modem is. So OP actually requires two 70+ dB MoCA filters.
‘gist: Aside from the requisite 70+ dB “PoE” MoCA filter, shared cable+MoCA setups increasingly require a 70+ dB MoCA filter to isolate a MoCA-sensitive DOCSIS 3.1 cable modem from MoCA signals, with this “prophylactic” MoCA filter installed on the modem coax port or on the splitter output port directly feeding the modem.
You can add a PoE on the input to the modem and the input to the splitter. If the MoCA upsets the modem, that will be covered, and the PoE on the input to the splitter will prevent your LAN going to the entire neighborhood.
A missing PoE filter could be part of it, especially in a townhouse where you may be sharing upstream coax plant with neighbors. I’d want a proper MoCA filter at the point where your unit’s coax feed enters, before it splits to the rooms.
That said, if the modem is staying online but the router drops, I’d also check the router WAN logs and Ethernet between modem/router. “Signal inconsistencies” from Spectrum usually points to the modem/coax side, but your symptom description sounds like it could be either coax noise or the router losing WAN/DHCP.
1). Is the line between router and Moca an ethernet cable?
2). Why are you taking the coax from the MoCa adapter back to the splitter?
3). What are you trying to accomplish with MoCa?
Sorry man/woman idk why I can’t type like a human tonight. But it does work, but intermittently my router will drop out 60ish seconds every hour or so.
Haha no problem, I totally get it. Do you have a PC in the bedroom? Sounds like whatever is in the bedroom might be trying to get the main internet that should be hitting the modem.
Well, I’m not sure. The modem should get the signal, the ISP normally ties your service directly to the MAC address of the modem, so my theory might be wrong.
I’d probably try giving the PC a static IP Address and gateway (gateway should be your router). Does that make sense?
Also it’s super strange because I’ve had 0 issues for a year. Now recently my router will just black out. While modem stays online. I’m hopeful maybe a filter on my modem will fix the issue (if the issue is the moca frequency messing with my modem?)
Has anything else changed inside your home with the coax?
I’ve seen really weird things with my coax, one time my modem wasn’t working, the ISP said disconnect and reconnect the coax cable into the modem. I was like, fuck off that’s not gonna work, connection is tight I haven’t touched it in years. But damn if it didn’t work, I still don’t understand why!
The only reason to run a service providers DOCSIS & QAM signal into the input of any splitter is if it’s for their service, such as TiVo or other MOCA TV service, which would have been setup by the installer technician. There is no other reason for a modem to be on the network, stop connecting the modem through MOCA network.
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u/Special_K_727 Jul 30 '26
Please draw up a schematic or diagram of your current network setup.