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Forum Discussion
CBR750 not tranmitting to Comcast
So after getting my replacement CBR750 a new problem has come up. I had a Comcast tech onsite Saturday 12-17-2022 after fixing a bunch of noisy lines, my speed is still around the same 910-890. However the tech told me that my modem isn't transmitting back to them, so he isn't sure how I am actually online. My modem showed inactive on his device and it should show active. When I look at my Comcast app it shows my modem offline (not connected) He looked in the history from my old modem and that modem wasn't transmitting back to Comcast either. I purchased a test modem and that modem was transmitting to Comcast. Is this a known problem for the CBR750?
Current Firmware Version V4.6.5.8_2.0.54
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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-routerHave 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-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.htmlTime Priority Description Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:01 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:02 Notice (6) CM-STATUS message sent. Event Type Code: 21 Dec 17 2022 14:04:02 Warning (5) Lost MDD Timeout Dec 17 2022 14:04:46 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out Dec 17 2022 15:26:46 Error (4) Missing Mandatory MDD TLV on primary DS Channel Dec 17 2022 15:27:02 Critical (3) SYNC Timing Synchronization failure - Loss of Sync Dec 17 2022 15:27:15 Warning (5) ToD request sent - No Response received Dec 17 2022 15:27:18 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Dec 17 2022 15:27:18 Notice (6) TLV-11 - unrecognized OID Dec 17 2022 15:27:18 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Dec 17 2022 15:27:19 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Dec 17 2022 15:27:29 Alert (2) CM Certificate Error Dec 17 2022 16:18:07 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Dec 17 2022 16:18:07 Notice (6) TLV-11 - unrecognized OID Dec 17 2022 16:18:07 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Dec 17 2022 16:18:11 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Dec 17 2022 16:18:20 Alert (2) CM Certificate Error Dec 17 2022 16:32:22 Notice (6) CM-STATUS message sent. Event Type Code: 5 Dec 17 2022 16:35:52 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Dec 17 2022 16:35:52 Notice (6) TLV-11 - unrecognized OID Dec 17 2022 16:35:52 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Dec 17 2022 16:35:56 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Dec 17 2022 16:36:06 Alert (2) CM Certificate Error Dec 17 2022 22:58:19 Critical (3) No Ranging Response received - T3 time-out Dec 18 2022 00:22:35 Notice (6) CM-STATUS message sent. Event Type Code: 5 Dec 18 2022 00:54:12 Critical (3) No Ranging Response received - T3 time-out Dec 18 2022 12:52:47 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Dec 18 2022 12:52:47 Notice (6) TLV-11 - unrecognized OID Dec 18 2022 12:52:47 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Dec 18 2022 12:52:51 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Dec 18 2022 12:53:00 Alert (2) CM Certificate Error Dec 18 2022 12:53:37 Critical (3) No Ranging Response received - T3 time-out Dec 18 2022 13:18:06 Notice (6) CM-STATUS message sent. Event Type Code: 5 Dec 18 2022 15:44:49 Alert (2) CM Certificate Error Dec 18 2022 16:13:17 Critical (3) No Ranging Response received - T3 time-out Dec 19 2022 13:47:07 Notice (6) CM-STATUS message sent. Event Type Code: 5 Dec 19 2022 15:44:48 Alert (2) CM Certificate Error Dec 19 2022 16:12:44 Critical (3) No Ranging Response received - T3 time-out Dec 19 2022 16:16:35 Notice (6) DS profile config update. DS Chan ID: 193. Dec 19 2022 17:30:26 Critical (3) No Ranging Response received - T3 time-out Got the Cable Connections status page?
Be sure the ISP provisions the modem correctly. I see some critical that the ISP needs to look at.
"Config File Rejected due to Invalid or Unexpected TLV 11"
"Error (4) Missing Mandatory MDD TLV on primary DS Channel"
Has a factory reset been performed with the CBR disconnected from the ISP Coax line.
Was the test modem another CBR or a different modem altogether?
