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My downstream LED went out a few days ago but the CM3000 is fully functional
I as well have the Xfinity Gigabit X2 plan. My downstream LED went out a few days ago but the CM3000 is fully functional and all 32 downstream channels are locked.
I installed this modem on 1/15/2025 and has been working fine for 6 Months. However, a few weeks ago my online LED went out and a few weeks later it came back on and now only the Downstream is out.
I don't know what is going on. One would think if a LED is burnt out it would never come back on ever.
10 Replies
What firmware version is on the CM3000 modem?
Has a power OFF of the modem for 1 minute then back ON been performed?
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-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
What is the brand and model of the host wifi router connected to the modem?Any progress on this?
Thanks, I didn't know there was a reply.
Xfinity X2 service 2GIG,
I'm presently connected via the router 1G LAN input.
Firmware Version V5.01.02
It's strange yesterday the downstream came back on and this morning the online was out but now ow all the LED's are on.
The host router id TP=Link DECOXE75 Pro.
Yes, the cable in question is a 6' yellow CAT6 cable I was not really using the system yesterday. Also all LED's are working.
I will paste most of the cable connection as requested.
I do use a VPN most of the time but I have to disable it to supply this data.
As you can see my speeds are good. I have at times connected my pc to a satellite 2.5G LAN input to obtain about 1.7G download speeds via wireless to the main router.
I just noticed the downstream LED is out again.
I'm hesitant to supply the event log because it contains MAC addresses.
Apparently, it only lets me attach one image.
Ok, making sure your on v5 FW. There are known issues on v6 FW.
Edit out the MAC addresses.
Time Priority Description Wed Jul 30 09:36:15 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 08:55:11 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 15 17 19 21 24 25 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 08:54:55 2025 (Warning (5)) MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 08:54:52 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 07:32:29 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 07:24:45 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 07:22:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 10 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 06:31:25 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 06:22:55 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 06:02:55 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 10 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Wed Jul 30 05:45:38 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 22:20:10 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 22:15:06 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 22:15:04 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 22:15:00 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 21:45:49 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 20:53:40 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 12 13.;CM-;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 20:44:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 20:41:49 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 20:17:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 20:12:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 19:52:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 18:52:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 10 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 18:32:10 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 18:15:01 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 17:23:53 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 8; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 17:23:47 2025 (Critical (3)) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 17:23:47 2025 (Critical (3)) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 17:23:47 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:50:09 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 8; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:49:55 2025 (Critical (3)) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:49:55 2025 (Critical (3)) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:49:55 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:36:19 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 8; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:36:08 2025 (Critical (3)) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:36:08 2025 (Critical (3)) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 15:36:08 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 07:27:28 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 8; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; Tue Jul 29 07:27:04 2025 (Warning (5)) Dynamic Range Window violation Tue Jul 29 07:27:04 2025 (Warning (5)) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; 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.
Please post a copy and paste of the modems connection status log page.
I sent this earlier, but it apparently did not go through.
Thanks, FURRYe38
Hopefully you received the (2) screenshots I sent.
I just rebooted the modem and the online LED is off or very dimly lit.
wingbike
Thanks FURRYe38,
There was a cable save on the CM3000 web page. I will paste it. When I saved it the downstream and online LED's were both out. They stayed out for several hours only flashing once or twice. Later in the day the downstream came back on but the online is still out. Yesterday I rebooted the modem, and the online LED never came on during boot up and stayed out.
It's very strange how the modem can be fully functional, and the modem status page looks good. I never saw a flaky LED so it must be an internal led driver etc., unless it's a bad surface mount soldering.
Cable Diagnostic
Status: Good
Action:
Your setup looks fine. If you can't access the internet, make sure you properly activated the modem. If modem has been activated and you still can't access the internet, contact your service provider for troubleshooting help.
If you can access the internet but has other internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.CM Status: Good
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR Level: Good
Upstream Status: Good
Upstream Power Level: Good
Current Time: Sat Aug 02 08:24:49 2025Startup Procedure
Acquire Downstream Channel: 513000000 Hz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD IPv6 only
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 20 513000000 Hz -1 43.4 0 0
2 Locked QAM256 13 471000000 Hz -0.1 44.3 0 0
3 Locked QAM256 14 477000000 Hz -0.3 44.2 0 0
4 Locked QAM256 15 483000000 Hz -0.3 44.2 0 0
5 Locked QAM256 16 489000000 Hz -0.5 44 0 0
6 Locked QAM256 17 495000000 Hz -0.5 44 0 0
7 Locked QAM256 18 501000000 Hz -0.9 43.6 0 0
8 Locked QAM256 19 507000000 Hz -0.8 43.5 0 0
9 Locked QAM256 21 519000000 Hz -1 43.7 0 0
10 Locked QAM256 22 525000000 Hz -1.1 43.7 0 0
11 Locked QAM256 23 531000000 Hz -1.1 43.7 0 0
12 Locked QAM256 24 537000000 Hz -1.1 43.6 0 0
13 Locked QAM256 25 543000000 Hz -1 43.6 0 0
14 Locked QAM256 26 549000000 Hz -1 43.6 0 0
15 Locked QAM256 27 555000000 Hz -0.8 43.7 0 0
16 Locked QAM256 28 561000000 Hz -1 43.5 0 0
17 Locked QAM256 29 567000000 Hz -0.9 43.6 0 0
18 Locked QAM256 30 573000000 Hz -1 43.5 0 0
19 Locked QAM256 31 579000000 Hz -1.1 43.1 0 0
20 Locked QAM256 32 585000000 Hz -1 43.2 0 0
21 Locked QAM256 33 591000000 Hz -1.2 43.3 0 0
22 Locked QAM256 34 597000000 Hz -1.1 43.2 0 0
23 Locked QAM256 35 603000000 Hz -1.3 43.2 0 0
24 Locked QAM256 36 609000000 Hz -1.2 43.4 0 0
25 Locked QAM256 37 615000000 Hz -1.3 43.2 0 0
26 Locked QAM256 38 621000000 Hz -1.1 43.3 0 0
27 Locked QAM256 39 627000000 Hz -1.1 43.3 0 0
28 Locked QAM256 40 633000000 Hz -1.3 43.2 0 0
29 Locked QAM256 41 639000000 Hz -1.1 43.3 0 0
30 Locked QAM256 42 645000000 Hz -1 43.4 0 0
31 Locked QAM256 43 651000000 Hz -0.7 43.5 0 0
32 Locked QAM256 44 657000000 Hz -0.6 43.2 0 0Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 43.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 43.0 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 42.8 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 42.5 dBmV
5 Not Locked Unknown 0 0 0 0.0
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 ,3 193 690000000 Hz -1.52 dBmV 42.4 dB 568 ~ 3527 643212108 556193356 212735
2 Locked 0 ,1 ,2 ,3 194 957000000 Hz -4.52 dBmV 40.7 dB 148 ~ 3947 645522314 579525469 0Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Locked 12 ,13 41 36200000 Hz 35.8 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
