CBR750 - Downstream light blinking

[Retired_Member]

hey all, 

Just got an Orbi CBR750 the other day and had comcast come in and replace all the lines. I'm seeing my downstream light continuously blink. Any troubleshooting advice would be greatly appreciated. 

Firmware:
V4.6.14.4_2.3.12

Connection:

Status: Poor

Internet Access: Good

Downstream Status: Poor

Partial Service: Poor
Cable modem is in partial service mode. Your service provider might be under maintenance. Most of the time it won't affect your traffic and will automatically clear when work is complete.

Downstream Power Level: Good

Downstream SNR: Good

Upstream Status: Good

Upstream Power Level: Good

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 507000000 Hz Locked Connectivity State Ok Operational Boot State Ok Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4)

Downstream Bonded Channels Partial Service

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectable 1 Locked QAM 256 4 405000000 Hz 2.7 dBmV 37.6 dB 10 0 2 Locked QAM 256 5 411000000 Hz 2.9 dBmV 37.6 dB 0 0 3 Locked QAM 256 6 417000000 Hz 3.2 dBmV 37.6 dB 1 0 4 Locked QAM 256 7 423000000 Hz 3.2 dBmV 37.3 dB 0 0 5 Locked QAM 256 8 429000000 Hz 3.5 dBmV 37.6 dB 0 0 6 Locked QAM 256 9 435000000 Hz 3.5 dBmV 38.6 dB 0 0 7 Locked QAM 256 10 441000000 Hz 3.7 dBmV 37.6 dB 0 0 8 Locked QAM 256 11 447000000 Hz 4.0 dBmV 37.6 dB 0 0 9 Locked QAM 256 12 453000000 Hz 4.3 dBmV 38.6 dB 0 0 10 Locked QAM 256 13 459000000 Hz 4.3 dBmV 37.6 dB 0 0 11 Locked QAM 256 14 465000000 Hz 4.1 dBmV 37.6 dB 0 0 12 Locked QAM 256 15 471000000 Hz 4.3 dBmV 38.6 dB 0 0 13 Locked QAM 256 16 477000000 Hz 4.5 dBmV 37.6 dB 0 0 14 Locked QAM 256 17 483000000 Hz 4.8 dBmV 37.6 dB 0 0 15 Locked QAM 256 18 489000000 Hz 4.9 dBmV 38.6 dB 0 0 16 Locked QAM 256 19 495000000 Hz 4.8 dBmV 38.6 dB 0 0 17 Locked QAM 256 20 507000000 Hz 4.9 dBmV 37.6 dB 7 0 18 Locked QAM 256 21 513000000 Hz 5.1 dBmV 38.6 dB 0 0 19 Locked QAM 256 22 519000000 Hz 5.4 dBmV 38.6 dB 0 0 20 Locked QAM 256 23 525000000 Hz 5.4 dBmV 38.9 dB 0 0 21 Locked QAM 256 24 531000000 Hz 5.1 dBmV 38.6 dB 0 0 22 Locked QAM 256 25 543000000 Hz 5.4 dBmV 38.6 dB 0 0 23 Locked QAM 256 26 549000000 Hz 5.4 dBmV 38.6 dB 0 0 24 Locked QAM 256 27 555000000 Hz 5.5 dBmV 37.6 dB 0 0 25 Locked QAM 256 28 561000000 Hz 5.5 dBmV 38.6 dB 0 0 26 Locked QAM 256 29 567000000 Hz 5.5 dBmV 38.6 dB 0 0 27 Locked QAM 256 30 573000000 Hz 5.5 dBmV 38.6 dB 0 0 28 Locked QAM 256 31 579000000 Hz 5.4 dBmV 38.6 dB 0 0 29 Locked QAM 256 32 585000000 Hz 5.6 dBmV 38.6 dB 0 0 30 Locked QAM 256 33 591000000 Hz 5.9 dBmV 38.6 dB 0 0 31 Locked QAM 256 34 597000000 Hz 5.9 dBmV 38.9 dB 0 0 32 Not Locked N/A N/A 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 Ksym/sec 16400000 Hz 47.8 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 46.8 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 46.3 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 46.3 dBmV 5 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV

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 48 -2800000 Hz 13.5 dBmV 0.0 dB 0~0 0 0 0 2 Not Locked 0 0 0 Hz 0.0 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 0.0 dBmV 2 Not Locked 0 0 0 Hz 0.0 dBmV

Current System Time: Thu Mar 9 18:33:45 2023

System Up Time 00:43:54

Event Log

Time	Priority	Description
Mar 08 2023 20:18:01	Notice (6)	TLV-11 - unrecognized OID
Mar 08 2023 20:18:01	Notice (6)	TLV-11 - unrecognized OID
Mar 08 2023 20:18:01	Notice (6)	TLV-11 - unrecognized OID
Mar 08 2023 20:18:01	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 08 2023 20:18:11	Warning (5)	RCS Partial Service
Mar 08 2023 20:18:19	Alert (2)	CM Certificate Error
Mar 09 2023 07:16:43	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 12:32:18	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 12:32:18	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 12:32:18	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 12:32:28	Warning (5)	RCS Partial Service
Mar 09 2023 12:32:36	Alert (2)	CM Certificate Error
Mar 09 2023 12:37:40	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 12:37:40	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 12:37:40	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 12:37:50	Warning (5)	RCS Partial Service
Mar 09 2023 12:37:59	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 16:44:16	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 16:44:16	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 16:44:16	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 16:44:26	Warning (5)	RCS Partial Service
Mar 09 2023 16:44:34	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:11:38	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:11:38	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:11:38	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:11:48	Warning (5)	RCS Partial Service
Mar 09 2023 17:11:56	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:35:12	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:35:13	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:35:13	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:35:22	Warning (5)	RCS Partial Service
Mar 09 2023 17:35:31	Notice (6)	CM-STATUS message sent. Event Type Code: 5
Mar 09 2023 17:35:31	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:51:11	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:51:11	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:51:11	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:51:21	Warning (5)	RCS Partial Service
Mar 09 2023 17:51:29	Alert (2)	CM Certificate Error

[FURRYe38]

Please post a copy and paste of the modems event log page.
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-mode...

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://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

[Retired_Member]

Here's a fresh one

Time	Priority	Description
Mar 08 2023 20:18:01	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 08 2023 20:18:01	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 08 2023 20:18:01	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 08 2023 20:18:01	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 08 2023 20:18:11	Warning (5)	RCS Partial Service
Mar 08 2023 20:18:19	Alert (2)	CM Certificate Error
Mar 09 2023 07:16:43	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 12:32:18	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 12:32:18	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 12:32:18	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 12:32:28	Warning (5)	RCS Partial Service
Mar 09 2023 12:32:36	Alert (2)	CM Certificate Error
Mar 09 2023 12:37:40	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 12:37:40	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 12:37:40	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 12:37:50	Warning (5)	RCS Partial Service
Mar 09 2023 12:37:59	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 16:44:16	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 16:44:16	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 16:44:16	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 16:44:26	Warning (5)	RCS Partial Service
Mar 09 2023 16:44:34	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:11:38	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:11:38	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:11:38	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:11:48	Warning (5)	RCS Partial Service
Mar 09 2023 17:11:56	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:35:12	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:35:13	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:35:13	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:35:22	Warning (5)	RCS Partial Service
Mar 09 2023 17:35:31	Notice (6)	CM-STATUS message sent. Event Type Code: 5
Mar 09 2023 17:35:31	Alert (2)	CM Certificate Error
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mar 09 2023 17:51:11	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 09 2023 17:51:11	Notice (6)	TLV-11 - unrecognized OID
Mar 09 2023 17:51:11	Critical (3)	Config File Rejected due to Invalid or Unexpected TLV 11
Mar 09 2023 17:51:21	Warning (5)	RCS Partial Service
Mar 09 2023 17:51:29	Alert (2)	CM Certificate Error
Mar 10 2023 10:21:39	Critical (3)	No Ranging Response received - T3 time-out

[FURRYe38]

Ya theres line issues here. The ISP needs to review all Alerts, Criticals and Warnings and resolve them. 

[Retired_Member]

Thanks for taking a look. Will give comcast a call and see if they can fix it. 

[FURRYe38]

Something else to try, someone else posted that they reloaded the CBR750 with the FW update file using a wired PC and web browser, factory reset and setup from scratch help them as well. Something to try in mean time when you can while you wait for the ISP to review the logs.