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I seem to be having connection issues whenever the upstream light on my modem starts blinking rather than remaining solid.
The short of it:
Modem: Netgear CM700
Upstream light on my modem should be a solid green. When I lose connection to the internet the upstream light is blinking and if the issue doesn't resolve the modem will cycle downstream/upstream until it connects. Sometimes I have to reboot the modem for it to actually reconnect to the internet. This is a brand new modem but I was having similar issues with my old Arris SURFboard before I switched to this. This issue persists if I remove the router from the picture.
I already had a tech out early morning on Saturday and he was unable to see any problem with my modem or the line. He thought maybe it was my old coaxial cable and provided/installed a new one. Modem worked fine for about 2 hours then went right back into the unpredictable connection routine. I have another tech coming out Monday evening to see if they can help me but I would like to ask for other avenues for the tech to investigate if they do not see any problems again.
I managed to get to a T2 and talked over my issue and since it's intermittent and didn't occur while I was on the line they weren't seeing any issues.
Modem event log at time of an upstream error causing connection issue:
Modem information at time of writing:
I didn't grab the upstream information like I thought I did right after the reboot but channels 3 and 4 were around 49 dBmV when the modem reconnected to the internet.
Thank you in advance for any further questions I can pose to the tech that will be out and for your assistance.
Managed to get into the modem during one of these episodes:
First, not that it's causing your problem, but watch out for the CM700. Has the lemon Puma 6 CPU inside it. While Cox is in the process of rolling out the newest patch it has been a long time coming, and is still hit or miss. CM600 or CM1000 would be the models above and below the CM700 which are not effected by the bug.
With that said, your issue is your upstream power levels. Looks like noise is occuring randomly and forcing your modem to yell to be heard, causing the T3 errors. Can you describe how the coaxial gets from the street to your house? Splitters? Amps? Underground wiring?
I was plagued with the same puma 6 with the Arris SB6190 I now have the SB8200 planning for the future. My area has its monthly cycle of great quality and a week of **. reason I replaced the SB6190. Some things I have learned. This thing called MoCa if your neighbors use a MoCa network like the panoramic wifi Cox offers and you or them do not have a POE MoCa filter you may be getting some interference from their network. MoCa filters are cheap or Cox may provide one. this helped my modem since the SB8200 has no MoCa blocking capabilities due to the DOCSIS 3.1. But look in to a MoCa filter, did help my situation but still my area is bad in connection as usual
I pay for 300x30 current speed 12x30 alway great here in my area.
I collect a lot of uncorrectable when the quality in my area gets bad not sure what causes these to include a few days of errors. ranges from level 3 to level 6 errors. I belive a lot of our connection issues have become more frequent every time a new speed level is added and cox is unable to sustain in the beginning. im looking fwd to cox fiber I have my fingers crossed that it makes it to my area.
I had a second tech out at the start of the week taking a look into my situation over here. He did the usual signal test but as I was explaining the issue he said "interference" and said he was going to go grab some tools off his truck. He came back in and tested my line and found power on it. He traced it to my outside storage unit where an unknown cable was being fed into a splitter that was rather dated (probably installed some 15+ years ago at this location). I had the tech bypass the splitter as I wasn't using the cable in my bedroom and have no intention to use it during the next 6 months that I'll be here.
The internet worked fine for a few hours after that discovery but again started to have issues as the evening rolled on. I let most of the week go by to see how many times I would get T3 time-out issues so I could report back asking for further assistance. Today I jumped on my modem to see what the event log had to say and found the following:
It's not showing now but at the time of the T3 time-out today around 5 pm my dBmV for upstream channels was pushing 51 again.
Here is an updated look at my downstream and upstream channels:
Since the issue seems to persist (granted not as heavily as it was when I had power running on my coaxial for who-knows-what reason) I would like to ask if there is any further insight you could provide. If this is a chip issue as was stated by UnhappyCustomer1 is there nothing I can do while waiting for the patch on the issue? Also I cannot explain how the cable gets from the street to my particular apartment though I am right next to the street/cable lines and lines are usually run underground here, not 100% sure that's the case here but I think it is. Assuming the only splitter in my apartment was the one in the storage unit I no longer go through any splitters.
Time for the 3rd technician. Can you take pictures of the coaxial wiring?