Arris SB6190

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The SB6190 is supported by Cox up to 500Mbps down as per here. However I don't know what Cox requires for different upload speeds. I think it can be anything from 10-50Mbps for the 500Mbps plan. I think it depends on if your area is mid-split, but Cox doesn't seem to have mid-split hardware requirements like other ISP like Comcast. I haven't even heard what the upload speed cap is for a DOCSIS 3.0 modem like the SB6190. Have you heard of anything? Not so much related to OP, because they are reporting a download issue, but the question has come up in other posts.

WiderMouthOpen Honestly, I haven't done a ton of research into our upload requirements. From what I've seen when checking specs on different modems, approved devices are aligned with the tiers they are compatible with by our back office teams, and I know our network provisioning and engineering practices are designed to enable customers to receive the speeds they are subscribed to. 

Once OP confirms what device they are currently using we'll be able to dig a little deeper into what might be going on. 

The 6190 is a D3 modem 500 down/10 up. It's old, I would replace it. 

First, OP said they bought SB6190 new, so it's not old as in wear and tear. They have tried 3 modems all with the same issue. Cox classifies it for speeds up to 500Mbps/10 so it's not a compatibility issue. A D3.1 modem might help with congestion, but I don't think that's what this is. Also, OP has shown a clear signal issue in the 700Mhz range. I would suggest getting that fixed before throwing more money at the issue.

Sorry, old as in technology. It was initially manufactured in October of 2015, making the technology 9 ½ years old. In computer terms, that's ancient, along with the popular CPY the 4790 I7 Haswell chip. Also, it's got that puma 6 chipset, that a class action lawsuit against Arris was filed because of the latency issues caused by jittery connectivity. 

So you are saying a modem fresh out of the box would report bad signal just because it was manufactured 9.5 years ago? Why? If your 9.5 year old car was saying it was out of gas, would you think the gas meter is broken or that you are actually out of gas? Also he tried other modems and had the same problem. On top of that, the issue was latency based like you said, which has nothing to do with speed. 

::edit:: This will be my last reply on this post. It takes more time to click on all the "show more" links to find what I want to reply to then it takes to actually write the reply. Who designed this forum? What is the point of "show more"? Why not just show the entire thread? At least direct the link in the notification to the post the notification is about. 

Hi, there. If this SB6190 has the Puma chipset, this may be related to the known issue for that device. Here is a link related to the issue: https://approvedmodemlist.com/intel-puma-6-modem-list-chipset-defects/ . It seems to occur mostly when the modem is under a lot of download pressure. I'm glad to hear switching the modem has helped stabilize your connection. Please let me know if I can assist you further and I will do my best to assist. 

That modem is known as a lemon, but a lot of it should have been fixed by firmware updates. Also, I think the problem with it was with the latency not download speeds so I think something else is going on. Are you satisfied with the solution? What model modem are you using?

Hello. I recommend sending us an email with your full name, address, and a brief description of this concern to cox.help@cox.com 

I thought you had a SB6190 and swapped to your old Zoom modem and everything worked? If so, seems the fault is on the SB6190. Also, why can't you return them? Did you not buy them somewhere that has a return policy? Like were they second hand? Last, try posting the signal levels from 192.168.100.1.

I bought them new at Best Buy but no longer have the boxes. I could try returning as defective I guess but it has been a while since they were purchased. I'll try that in a couple of days after the snow melts (New Orleans).I am not sure what is meant by posting signal levels from that IP.

Thanks to Everyone for the Help!!

What model modem are you using now? You get the signal levels by entering in that IP into a browser. It is the local website for the modem itself. Just like a router has a page where you configure it, so does a modem have a page with read only diagnostics, including signal levels. Every stand alone modem uses that IP.

Zoom 5345 

It appears someone came out and worked on the pole hardware. Speeds are better over all and nothing below 111 Mbps. 

Something common I hear is when there is a leak in the tap(the device that connects the main line to the different drops going to houses) and because of thermal dynamics, it sucks in water through the leak.