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CM1100 need to reset modem constantly with COX
Hi all, used to be every few days but now I am having to reset the modem multiple times a day and it is driving me nuts. Here is the connection after a factory reset. Many thanks!
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Looks good. Some channels are a bit far in power between the channels however if it's working. Let it run.
28 Replies
Your power levels are way low and you have a large number of correctable/uncorrectable code words.
The power levels should be between +7 dBmV and -7 dBmV. For reference, see the top two sentences on this support document. https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
The next time you copy the connection status page, include the system up time. The correctable/uncorrectable counts reset to zero when you boot the modem. Not knowing how long it took your modem to reach the values indicated is a problem.
You have some serious line issues that need to be resolved by your ISP. You can check your coax cable for damage, corroded or loose connections, old splitters, amplifiers, etc. that can negatively impact your signal. Keep in mind, some of your issues could be house wiring your ISP would charge you to correct.
Thank you Kitsap,
I do have a Cox tech coming out tomorrow, but I'd like to understand the issue a little bit so thank you very much for taking the time to review this issue.
I don't know if there is a splitter in the box outside or not but there is only a F81 connector connecting the cables from the box and where the modem is located. The wiring is original so 24 years old.
The connection up time when I posted was no more than 10 mins.
Here is the update connection status with system up time. Way more correctable and uncorrectable codewords now.Startup Procedure Procedure Status Comment Acquire Downstream Channel 855000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv4 only Downstream Bonded Channels (Partial Service) Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 21 855000000 Hz -14.3 dBmV 35.5 dB 328693178 20636 22661 2 Locked QAM256 5 759000000 Hz -10.9 dBmV 27.4 dB 5774241 16536366 55567144 3 Locked QAM256 7 771000000 Hz -10.5 dBmV 39.0 dB 327638939 15273 15660 4 Locked QAM256 8 777000000 Hz -11.4 dBmV 38.9 dB 176077955 284318 574636 5 Locked QAM256 9 783000000 Hz -11.0 dBmV 39.2 dB 136105481 543275 1456156 6 Locked QAM256 10 789000000 Hz -11.5 dBmV 38.8 dB 327641674 23086 21979 7 Locked QAM256 11 795000000 Hz -12.2 dBmV 38.2 dB 327656367 16076 16748 8 Locked QAM256 12 801000000 Hz -11.5 dBmV 38.7 dB 327660263 15765 16277 9 Locked QAM256 13 807000000 Hz -12.4 dBmV 38.0 dB 327667349 15585 16455 10 Locked QAM256 14 813000000 Hz -12.5 dBmV 37.9 dB 327667045 15892 16786 11 Locked QAM256 15 819000000 Hz -12.4 dBmV 38.1 dB 327672400 16541 16954 12 Locked QAM256 16 825000000 Hz -13.7 dBmV 37.1 dB 327673214 17453 18275 13 Locked QAM256 25 117000000 Hz -1.0 dBmV 44.5 dB 56219001 63485 72081 14 Locked QAM256 26 123000000 Hz -1.5 dBmV 44.1 dB 174068536 155663 218077 15 Locked QAM256 27 129000000 Hz -1.7 dBmV 44.3 dB 41622214 42504 59304 16 Locked QAM256 28 135000000 Hz -2.5 dBmV 44.2 dB 67786450 143318 211413 17 Locked QAM256 29 141000000 Hz -3.2 dBmV 44.3 dB 82571893 184982 300014 18 Locked QAM256 30 147000000 Hz -3.1 dBmV 44.3 dB 98404555 197061 333097 19 Locked QAM256 31 153000000 Hz -3.4 dBmV 44.3 dB 118219532 257729 446135 20 Locked QAM256 32 159000000 Hz -2.7 dBmV 44.7 dB 127242183 242042 431759 21 Locked QAM256 33 165000000 Hz -3.0 dBmV 42.4 dB 71911075 189290 368675 22 Locked QAM256 34 171000000 Hz -2.9 dBmV 44.6 dB 57851126 116772 198712 23 Locked QAM256 35 177000000 Hz -2.8 dBmV 44.7 dB 69636261 104833 226957 24 Locked QAM256 36 183000000 Hz -3.1 dBmV 37.0 dB 79070806 115492 291264 25 Locked QAM256 37 189000000 Hz -2.9 dBmV 44.5 dB 32298940 99232 262118 26 Locked QAM256 38 195000000 Hz -3.2 dBmV 32.8 dB 48665320 1481371 1356191 27 Locked QAM256 39 201000000 Hz -3.1 dBmV 44.7 dB 64652606 121776 275945 28 Locked QAM256 40 207000000 Hz -3.2 dBmV 43.3 dB 79938129 178392 504176 29 Locked QAM256 41 213000000 Hz -2.9 dBmV 40.0 dB 74499092 135016 319912 30 Locked QAM256 42 219000000 Hz -3.1 dBmV 45.0 dB 141626626 126901 333968 31 Locked QAM256 43 225000000 Hz -3.2 dBmV 44.9 dB 147492153 138828 316362 32 Locked QAM256 45 237000000 Hz -3.4 dBmV 44.8 dB 112051033 92936 155391 Upstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 1 16900000 Hz 43.5 dBmV 2 Locked ATDMA 2 23500000 Hz 44.3 dBmV 3 Locked ATDMA 3 29900000 Hz 44.3 dBmV 4 Locked ATDMA 4 36300000 Hz 44.8 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 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 -6.6 dBmV 40.8 dB 296 ~ 7895 1043281678 213193654 318797 2 Locked 0, 1, 2, 3 160 918000000 Hz -15.7 dBmV 31.3 dB 1108 ~ 2987 25611780 13734826 8122335 Upstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Locked 3, 4, 9, 10, 11, 12, 13 6 36800000 Hz 40.3 dBmV 2 Not Locked 3, 4, 9, 10, 11, 12, 13 0 0 Hz 0.0 dBmV Current System Time: Tue May 07 19:17:47 2024 System Up Time: 2:03:09
The levels are also all over the place. They should be within 3.5dbmv of each other.
Something is squirrelly with the line.
Thank you all for the reply. Cox tech came out this morning, he said the cable from the outside to the house needs to be replaced (he measured and said there is a 90% power drop).
He said to take care of this first and if issue still occur afterward than he can add a new cable from my house to where the modem is located.
Will report back and share the new connection status once the cable is replaced.
That should help as well the the correctables and un-correctables as those should be zeros across the board.
Also have the tech check the modems events logs. 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.
