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Forum Discussion
Solved
CM700 high US/UnCorrectables
Hi all, I have been experiencing internet issues for the last 3 years at my home. I found that my US(Upstream) power (modem transmitting data to the ISP) was intermittently maxing out (I forget th...
Have the ISP check the signal and line quality UP to the modem.
Be sure there are not coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.FYI:
OK, I would have the ISP run the line check at aswell. Have them review the logs as well.
Hope fully you or they can find where the main issue is.
Here’s an update:
I noticed that my Correctables/unCorrectables were still reaching >1,000 / channel within 24-48 hours following CM1000 install.
My US Power levels were typically ~47dBmV/channel and were periodically maxing out and causing T3/T4’s just like before.
Adding a splitter to attenuate any potential noise at the drop did not change my SNR/MER levels much, they remained 39-43.
So I bought a female-female adapter that had terminals for proper grounding. So I connected the drop directly to my coax line upstairs where my modem is connected (just like before) but this time with proper grounding. - NO CHANGE -
I researched a bit and ended up buying a 100ft Quad Shielded Coax from Amazon so I could run this temporarily from the drop to my modem upstairs. If this worked well and problems went away, I would know that my coax in the walls is the Root Cause.
Here’s the cable I bought:
100ft Weather Seal Quad Shield Outdoor 3GHZ RG-6 Coaxial Cable 75 Ohm (Satellite TV or Broadband Internet) Anti Corrosion Brass Connector RG6 Fittings Assembled in USA by PHAT Satellite INTL
https://www.amazon.com/dp/B01GBX8HIG/ref=cm_sw_r_cp_api_i_5HENEbFNQ5AMD
Unfortunately, ~113 hours of UpTime, and each Channel has >2,000 correctables/unCorrectables just like before.
Adding the splitter in series with this new cable causes the US to increase to max and cause T3/T4’s as well.
So this means that the Root Cause must be somewhere on Spectrum’s end. Whether it be someone in the neighborhood introducing noise, an issue at the node or something else.
I feel better having ruled out issues on my end, and I don’t expect this to be resolved in a timely manner, as is no surprise I’m sure based on TimeWarner/Spectrum’s history with resolving these types of issues.
Just for fun/reference I will include a capture of my log today. I’ve been taking a screenshot of my log/cable connection every day, so I have the daily history too which may come in handy.
Let me know if you notice anything I missed!
Thanks.
I noticed that my Correctables/unCorrectables were still reaching >1,000 / channel within 24-48 hours following CM1000 install.
My US Power levels were typically ~47dBmV/channel and were periodically maxing out and causing T3/T4’s just like before.
Adding a splitter to attenuate any potential noise at the drop did not change my SNR/MER levels much, they remained 39-43.
So I bought a female-female adapter that had terminals for proper grounding. So I connected the drop directly to my coax line upstairs where my modem is connected (just like before) but this time with proper grounding. - NO CHANGE -
I researched a bit and ended up buying a 100ft Quad Shielded Coax from Amazon so I could run this temporarily from the drop to my modem upstairs. If this worked well and problems went away, I would know that my coax in the walls is the Root Cause.
Here’s the cable I bought:
100ft Weather Seal Quad Shield Outdoor 3GHZ RG-6 Coaxial Cable 75 Ohm (Satellite TV or Broadband Internet) Anti Corrosion Brass Connector RG6 Fittings Assembled in USA by PHAT Satellite INTL
https://www.amazon.com/dp/B01GBX8HIG/ref=cm_sw_r_cp_api_i_5HENEbFNQ5AMD
Unfortunately, ~113 hours of UpTime, and each Channel has >2,000 correctables/unCorrectables just like before.
Adding the splitter in series with this new cable causes the US to increase to max and cause T3/T4’s as well.
So this means that the Root Cause must be somewhere on Spectrum’s end. Whether it be someone in the neighborhood introducing noise, an issue at the node or something else.
I feel better having ruled out issues on my end, and I don’t expect this to be resolved in a timely manner, as is no surprise I’m sure based on TimeWarner/Spectrum’s history with resolving these types of issues.
Just for fun/reference I will include a capture of my log today. I’ve been taking a screenshot of my log/cable connection every day, so I have the daily history too which may come in handy.
Let me know if you notice anything I missed!
Thanks.
I would have a tech come onsite and you can show him and he can test while your there. I would ask him to put on a different modem to test as well.