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Forum Discussion
CM1000 w/ R7000P
Hi
I’ve had my modem and router for a couple of years. Everything was working fine till couple months ago my internet has been buggy. I noticed the modem upstream light will blink green then stop. Now the upstream is solid amber. I did two power cycles however the upstream remains solid amber. My internet is working so not sure if my devices or my ISP. Does anyone know a solution? Do I need to have my ISP come out to check the lines or do I need a new modem or router?
45 Replies
What Firmware version is currently loaded?
https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-modem-router
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-routerFrequency 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 759000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv4 only Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 5 759000000 Hz 8.7 dBmV 42.6 dB 87718698 0 0 2 Locked QAM256 1 735000000 Hz 8.7 dBmV 42.6 dB 91067378 0 0 3 Locked QAM256 2 741000000 Hz 8.7 dBmV 42.6 dB 91074062 0 0 4 Locked QAM256 3 747000000 Hz 8.7 dBmV 42.6 dB 91077750 0 0 5 Locked QAM256 4 753000000 Hz 8.7 dBmV 42.6 dB 91081614 0 0 6 Locked QAM256 9 783000000 Hz 9.1 dBmV 42.7 dB 86854032 0 0 7 Locked QAM256 6 765000000 Hz 8.9 dBmV 42.6 dB 91088677 0 0 8 Locked QAM256 7 771000000 Hz 9.1 dBmV 42.7 dB 91092987 0 0 9 Locked QAM256 8 777000000 Hz 9.1 dBmV 42.8 dB 91096317 0 0 10 Locked QAM256 10 789000000 Hz 9.0 dBmV 42.8 dB 86884902 0 0
11 Locked QAM256 11 795000000 Hz 8.9 dBmV 42.7 dB 86892372 0 0 12 Locked QAM256 12 801000000 Hz 9.0 dBmV 42.7 dB 86899213 0 0 13 Locked QAM256 13 807000000 Hz 9.1 dBmV 42.7 dB 86906720 0 0 14 Locked QAM256 14 813000000 Hz 9.2 dBmV 42.7 dB 86914866 0 0 15 Locked QAM256 15 819000000 Hz 9.1 dBmV 42.8 dB 86922259 0 0 16 Locked QAM256 16 825000000 Hz 9.1 dBmV 42.8 dB 86929503 0 0 17 Locked QAM256 17 831000000 Hz 9.1 dBmV 42.7 dB 86937175 0 0 18 Locked QAM256 18 837000000 Hz 9.1 dBmV 42.7 dB 86944389 0 0 19 Locked QAM256 19 843000000 Hz 9.4 dBmV 42.9 dB 86952100 0 0 20 Locked QAM256 20 849000000 Hz 9.5 dBmV 43.0 dB 86959089 0 0 21 Locked QAM256 21 855000000 Hz 9.7 dBmV 43.0 dB 86967015 0 0 22 Locked QAM256 22 861000000 Hz 9.7 dBmV 43.1 dB 86974503 0 0 23 Locked QAM256 23 867000000 Hz 9.6 dBmV 43.0 dB 86980209 0 0 24 Locked QAM256 24 873000000 Hz 9.8 dBmV 42.9 dB 86984289 0 0 25 Locked QAM256 45 237000000 Hz 3.9 dBmV 41.7 dB 86989349 0 0 26 Locked QAM256 41 213000000 Hz 4.1 dBmV 41.9 dB 91159570 0 0 27 Locked QAM256 42 219000000 Hz 3.8 dBmV 41.8 dB 91163150 0 0 28 Locked QAM256 43 225000000 Hz 3.9 dBmV 41.9 dB 91167130 0 0 29 Locked QAM256 44 231000000 Hz 3.9 dBmV 41.9 dB 91170120 0 0 30 Locked QAM256 46 243000000 Hz 3.9 dBmV 41.9 dB 91168249 0 0 31 Locked QAM256 47 249000000 Hz 4.0 dBmV 41.8 dB 91168939 0 0 32 Locked QAM256 48 255000000 Hz 4.0 dBmV 41.6 dB 91168578 0 0 Upstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 1 36300000 Hz 43.3 dBmV 2 Locked ATDMA 2 29900000 Hz 43.3 dBmV 3 Locked ATDMA 3 23500000 Hz 43.3 dBmV 4 Locked ATDMA 4 16900000 Hz 43.3 dBmV 5 Not Locked Unknown 0 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Hz 0.0 dBmV
Can we get the Event Logs page data as well.
Power for some of our channels is too much and too high.
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
I'd day get a -3 or -6dbm cable coax line attenuator installed.
11 Locked QAM256 11 795000000 Hz 8.9 dBmV 42.7 dB 86892372 0 0
12 Locked QAM256 12 801000000 Hz 9.0 dBmV 42.7 dB 86899213 0 0
13 Locked QAM256 13 807000000 Hz 9.1 dBmV 42.7 dB 86906720 0 0
14 Locked QAM256 14 813000000 Hz 9.2 dBmV 42.7 dB 86914866 0 0
15 Locked QAM256 15 819000000 Hz 9.1 dBmV 42.8 dB 86922259 0 0
16 Locked QAM256 16 825000000 Hz 9.1 dBmV 42.8 dB 86929503 0 0
17 Locked QAM256 17 831000000 Hz 9.1 dBmV 42.7 dB 86937175 0 0
18 Locked QAM256 18 837000000 Hz 9.1 dBmV 42.7 dB 86944389 0 0
19 Locked QAM256 19 843000000 Hz 9.4 dBmV 42.9 dB 86952100 0 0Here you go. Seeing a lot of critical.
The coax line attenuator is that something I need to connect my ISP or can I do it myself. Where would I replace the attenuator?2026-01-06, 21:13:22 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:12:34 Notice (6) US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 9 13.;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:41 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:39 Warning (5) Dynamic Range Window violation 2026-01-06, 21:11:39 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:39 Warning (5) Dynamic Range Window violation 2026-01-06, 21:11:39 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:38 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:32 Notice (6) DS profile assignment change. DS Chan ID: 33; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:30 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; 2026-01-06, 21:11:25 Notice (6) TLV-11 - unrecognized OID;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1; Time Not Established Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=c8:9e:43:72:2f:60;CMTS-MAC=04:76:b0:24:4c:ef;CM-QOS=1.1;CM-VER=3.1;
Downstream OFDM Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked 0, 1, 2, 3 159 300000000 Hz 5.4 dBmV 41.0 dB 296 ~ 7895 26158032 21218248 0 2 Locked 0, 1, 2, 3 160 918000000 Hz 10.3 dBmV 41.8 dB 2216 ~ 5975 27450828 9026536 0 I apologize for multiple messages. It wouldn't let me copy/paste or upload images. Additionally, my modem has been acting up and keeps rebooting. I'll power cycle and reset everything, it will load up, then do it again. I have to reset a couple of times before it stops. Right now it's fine, but I know in a couple of days it will act up.
When I log into Netgear, it shows I'm on Firmware Version V10.01.07, and I'm with COX internet.
pstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Locked 3, 4, 9, 10, 11, 12, 13 6 36800000 Hz 38.5 dBmV 2 Not Locked 3, 4, 9, 10, 11, 12, 13 0 0 Hz 0.0 dBmV Page 6 of the user manual says that the Upstream LED showing solid amber indicates that one upstream channel is locked.
Is "pstream OFDMA" the same thing as "upstream"?
https://www.downloads.netgear.com/files/GDC/CM1000/CM1000_UM_EN.pdf
Hi yes, its the same thing, it just got cut off. How do I unlock it?
While I DID crimp some coax connectors 30 years ago, I have NO IDEA. I would start with calling Cox technical support and saying, "my modem says that the upstream channel is not 'locked'. Is this something your tech can fix?"
p.s. My guess is that this means your upstream bandwidth is half what it is supposed to be.
Thank you, I'll contact my ISP. Do you think it has to do with the lines inside or outside my house, given that I have warning and critical event logs?
My guess would be outside. Cable techs are REALLY good at checking things.
You got some channels that are too High in power some that are in the opposite direction but with in the power range:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no 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.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
