Visitor
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10 Messages
Internet Issues
Hello, for the last year or so I’ve been experiencing severe intermittent latency spikes while gaming and working from home. The connection is stable most of the time (~20–25ms to Google DNS), but every few minutes I get 1–2 second bursts of extremely high latency (2000–2700ms) before it returns to normal. This makes online applications and games unusable. I have been told everything is fine and the issue is on my end my I have done everything and it remains the same.
I ran extended WinMTR tests to verify:
Local router is clean (no loss, no latency).
The issue begins at Comcast’s first hop: 96.120.112.157. That hop shows spikes of 2000–2700ms worst-case, average ~15–26ms.
The spikes ripple through to all subsequent hops.
Final destination (Google DNS 8.8.8.8) is mostly stable, but the spikes are disruptive.
EG
Expert
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113.3K Messages
5 days ago
What do the modem's signal status values look like ? Try getting them here; http://192.168.100.1 or here http://10.0.0.1
Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
What is the exact make and model number of the modem / gateway device ?
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EG
Expert
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113.3K Messages
4 days ago
The signal status values were good at that snapshot in time. Please also post the modem's RF error log entries in their entirety (copy and paste all of the text) but redact the CM and the CMTS MAC addresses for privacy or else the forum bot will not allow your post to be seen publicly.
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EG
Expert
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113.3K Messages
4 days ago
The RF error log reporting seems to be disabled for some. The wifi activity / router logs would be unhelpful. The CM Error Codewords may be helpful.
(edited)
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EG
Expert
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113.3K Messages
4 days ago
A few of the downstream channels have a fairly large amount of uncorrectable bit errors. Perhaps there is noise ingress into the line(s) / an upstream channel / return path impairment somewhere.
There are other signal stat values that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees (The Digital Care Team) who are available to these boards. They will be able to poll the CMTS (Cable Modem Termination System) to check for any real-time degradation and / or error reports, see your node / cable plant, and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and those upstream receive signal stats.
You should get a reply here in your topic. Good luck !
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