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Forum Discussion
CM2000 modem unstable internet
Optimum has told me to contact netgear support about my modem. They claim that there is no issue on their end for my internet. But at night and some times randomly during the day my connection become...
A couple things.
1. the cable connections page only shows what's going on when you load the page. so next time you're having the issue, reload the page. that'll show us the power levels while the issue is going on.
2. the modem event log lets us look at issues longer term. A screen snip of that can help.
3. what makes you think its the modem? have you hardwired a computer to the modem and ran it during the period you usually have issues to test it?
4. what router is it connected to? Is it connected to a router with a 2.5g port? if so, try connecting it to the 1gig port on the router and use it. I've seen some routers that had issues with their 2.5gig ports.
To answer 3: I don't think it's the modem. I've had this issue before this modem, I bought this one to try and fix the issue, which it didn't. Saddly this issue ranges on how annoying it is so I let it slide most days. Today it's been very bad, so I called and they said everything seemed fine and to contact netgear support before sending out a tech to check in person.
4: Netgear XR500, I don't see any difference between the ethernet ports.
The event log:
Event Log
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You do have line notices/errors but they're not daily. And you have power violations. those usually mean the power has went out of spec and could be causing issues (dynamic range window violation)
does it happen every day?
When it happens, write down the times and compare them to the logs or post them back here with the times it happens and the logs.
- Internet is being horrible again today, there were more errors from earlier and from yesterday. I hit clear instead of refresh earlier in the day.Cable ConnectionCancel Apply
Frequency start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. Starting Frequency Startup Procedure Procedure Status Comment Acquire Downstream Channel 573000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 14 573000000 Hz 3.3 dBmV 41.2 dB 0 0 2 Locked QAM256 1 489000000 Hz 3.3 dBmV 41.4 dB 0 0 3 Locked QAM256 2 495000000 Hz 3.2 dBmV 41.4 dB 0 0 4 Locked QAM256 3 507000000 Hz 3.1 dBmV 41.3 dB 0 0 5 Locked QAM256 4 513000000 Hz 2.9 dBmV 41.1 dB 0 0 6 Locked QAM256 5 519000000 Hz 2.8 dBmV 41.1 dB 0 0 7 Locked QAM256 6 525000000 Hz 3.2 dBmV 41.3 dB 0 0 8 Locked QAM256 7 531000000 Hz 3.3 dBmV 41.3 dB 0 0 9 Locked QAM256 8 537000000 Hz 2.9 dBmV 41.1 dB 0 0 10 Locked QAM256 9 543000000 Hz 3.0 dBmV 41.1 dB 0 0 11 Locked QAM256 10 549000000 Hz 3.3 dBmV 41.1 dB 0 0 12 Locked QAM256 11 555000000 Hz 3.1 dBmV 41.2 dB 0 0 13 Locked QAM256 12 561000000 Hz 3.2 dBmV 41.3 dB 0 0 14 Locked QAM256 13 567000000 Hz 3.5 dBmV 41.3 dB 0 0 15 Locked QAM256 15 579000000 Hz 3.2 dBmV 41.1 dB 0 0 16 Locked QAM256 16 585000000 Hz 3.5 dBmV 41.2 dB 0 0 17 Locked QAM256 17 591000000 Hz 3.7 dBmV 41.4 dB 1 0 18 Locked QAM256 18 597000000 Hz 3.6 dBmV 41.3 dB 0 0 19 Locked QAM256 19 603000000 Hz 3.7 dBmV 41.3 dB 0 0 20 Locked QAM256 20 609000000 Hz 3.4 dBmV 41.1 dB 0 0 21 Locked QAM256 21 615000000 Hz 3.0 dBmV 40.9 dB 0 0 22 Locked QAM256 22 621000000 Hz 3.5 dBmV 41.0 dB 0 0 23 Locked QAM256 23 627000000 Hz 3.8 dBmV 41.1 dB 0 0 24 Locked QAM256 24 633000000 Hz 3.6 dBmV 41.1 dB 0 0 25 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 26 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 27 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 28 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 29 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 30 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 31 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 30800000 Hz 43.8 dBmV 2 Locked ATDMA 2 5120 37500000 Hz 45.3 dBmV 3 Locked ATDMA 3 5120 24100000 Hz 43.3 dBmV 4 Locked ATDMA 4 5120 17500000 Hz 43.3 dBmV 5 Not Locked Unknown 0 0 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 0 Hz 0.0 dBmV Downstream OFDM Channels Channel Lock
StatusModulation /
Profile IDChannel
IDFrequency Power SNR /
MERActive Subcarrier
Number RangeUnerrored
CodewordsCorrectable
CodewordsUncorrectable
Codewords1 Locked 0 ,1 ,2 ,3 159 717000000 Hz 5.3 dBmV 41.4 dB 1108 ~ 2987 12226530259 4295331810 2775 2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0 Upstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked 0 0 0 Hz 0 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV Event LogClear Log Refresh Time Priority Description Mon Jun 06 16:36:27 2022 (Error (4)) DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;