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Forum Discussion
CM1200 frequent drops in upload and download
brand new modem, ISP service connected to RAX80 router. SImple setup, no linke agg (just bouth the ability for the future). ISP service (400gbs up, 40gps down optimum) is good 80% of the time, but randomly drops during the day to bad levels (almost zero or zero up and down). Have had multiple visits from techs and in each case they blamed on outside lines and made adjustments. ISP is suggesting that cm1200 is bad and is recommending replacement with their modem. Modem firmware is 1.01.02, online netgear support shows 1.02.xx available but I can't get the ISP to push the firmware to see if it helps. Full logs in attachment.
Highlights noted some correctables in the download.
Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Correctables | Uncorrectables |
1 | Locked | QAM256 | 6 | 609000000 Hz | 6.7 dBmV | 39.5 dB | 0 | 0 |
2 | Locked | QAM256 | 1 | 567000000 Hz | 5.2 dBmV | 39.3 dB | 85 | 79 |
3 | Locked | QAM256 | 2 | 573000000 Hz | 6 dBmV | 39.6 dB | 10 | 46 |
Upload
Upstream Bonded Channels | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Upstream OFDMA Channels | ||||||||||||||||||
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Logs
Time | Priority | Description |
Wed Jun 03 12:50:31 2020 | Warning (5) | DHCP WARNING - Non-critical field invalid in response ;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:01:5c:7d:16:64;CM-QOS=1.1;CM-VER=3.1; |
Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv4 |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
Wed Jun 03 12:49:48 2020 | Critical (3) | Resetting the cable modem due to docsDevResetNow |
Tue Jun 02 19:15:23 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:01:5c:7d:16:64;CM-QOS=1.1;CM-VER=3.1; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
Tue Jun 02 09:39:26 2020 | Critical (3) | Resetting the cable modem due to docsDevResetNow |
Mon Jun 01 18:18:52 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:01:5c:7d:16:64;CM-QOS=1.1;CM-VER=3.1; |
Mon Jun 01 05:19:44 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:01:5c:7d:16:64;CM-QOS=1.1;CM-VER=3.1; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:b0:b6:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
Thu May 28 16:26:59 2020 | Critical (3) | Resetting the cable modem due to docsDevResetNow |
3 Replies
Have the ISP check the signal and line quality UP to the modem.
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.Try a different modem as well. See if the problem still happens or not.
I had another tech come out and they did verify that there was noise in the line. Regarding firmware upgrades, I purchased the modem form a retailier so is the ISP still responsible for firmware upgrades?
Some ISPs may not do FW updates on user owned modems. Something to ask the ISP about.
