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CM3000 Repeated Cox disconnects with SYNC Timing Synchronization failure
The CM3000, which I have owned for <30 days, is having repeated disconnection issues. Cox is my ISP. The disconnections occur randomly, but multiple times per day and always require a hard reboot. The Event Log shows many lines associated with each disconnect, but the "critical" error that prompts the disconnect appears to be the following: SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=54:07:7d:c6:e4:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; This identical entry has occurred dozens of times. Cox technicians have replaced all cable lines and connections to and from the modem out to the street. The last Cox service technician says that the modem is failing to maintain an upstream channel lock and that the problem is with the modem. Additional information: Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 5 141000000 Hz 7.9 dBmV 45.6 dB 0 0 2 Locked QAM256 1 117000000 Hz 7.6 dBmV 45.2 dB 0 0 3 Locked QAM256 2 123000000 Hz 7.9 dBmV 45.6 dB 0 0 4 Locked QAM256 3 129000000 Hz 7.9 dBmV 45.6 dB 0 0 5 Locked QAM256 4 135000000 Hz 8.0 dBmV 45.8 dB 0 0 6 Locked QAM256 6 147000000 Hz 7.8 dBmV 45.9 dB 0 0 7 Locked QAM256 7 153000000 Hz 7.7 dBmV 45.9 dB 0 0 8 Locked QAM256 8 159000000 Hz 7.7 dBmV 45.9 dB 0 0 9 Locked QAM256 9 165000000 Hz 7.6 dBmV 45.9 dB 0 0 10 Locked QAM256 10 171000000 Hz 7.6 dBmV 46.0 dB 0 0 11 Locked QAM256 11 177000000 Hz 7.5 dBmV 45.9 dB 0 0 12 Locked QAM256 12 183000000 Hz 7.7 dBmV 46.0 dB 0 0 13 Locked QAM256 13 189000000 Hz 7.7 dBmV 46.0 dB 0 0 14 Locked QAM256 14 195000000 Hz 7.8 dBmV 44.5 dB 0 0 15 Locked QAM256 15 201000000 Hz 7.8 dBmV 45.1 dB 0 0 16 Locked QAM256 16 207000000 Hz 7.8 dBmV 45.3 dB 0 0 17 Locked QAM256 17 213000000 Hz 7.9 dBmV 46.0 dB 0 0 18 Locked QAM256 18 219000000 Hz 7.8 dBmV 46.1 dB 0 0 19 Locked QAM256 19 225000000 Hz 7.7 dBmV 46.2 dB 0 0 20 Locked QAM256 20 231000000 Hz 7.7 dBmV 46.3 dB 0 0 21 Locked QAM256 21 237000000 Hz 7.5 dBmV 46.3 dB 0 0 22 Locked QAM256 22 243000000 Hz 7.5 dBmV 46.3 dB 0 0 23 Locked QAM256 23 249000000 Hz 7.4 dBmV 46.3 dB 0 0 24 Locked QAM256 24 255000000 Hz 7.4 dBmV 46.0 dB 0 0 25 Locked QAM256 25 735000000 Hz 6.0 dBmV 44.1 dB 0 0 26 Locked QAM256 26 741000000 Hz 6.0 dBmV 44.0 dB 0 0 27 Locked QAM256 27 747000000 Hz 5.9 dBmV 43.9 dB 0 0 28 Locked QAM256 28 753000000 Hz 6.2 dBmV 43.9 dB 0 0 29 Locked QAM256 29 759000000 Hz 6.1 dBmV 43.8 dB 0 0 30 Locked QAM256 30 765000000 Hz 6.0 dBmV 43.8 dB 0 0 31 Locked QAM256 31 771000000 Hz 5.9 dBmV 43.7 dB 0 0 32 Locked QAM256 32 777000000 Hz 5.7 dBmV 43.6 dB 0 0 Upstream Bonded Channels (Partial Service) Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 2 5120 Ksym/sec 24000000 Hz 34.5 dBmV 2 Locked ATDMA 1 5120 Ksym/sec 17600000 Hz 34.0 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 30400000 Hz 34.5 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 36800000 Hz 35.0 dBmV 5 Not Locked Unknown 0 0 0 0.0 dBmV 6 Not Locked Unknown 0 0 0 0.0 dBmV 7 Not Locked Unknown 0 0 0 0.0 dBmV 8 Not Locked Unknown 0 0 0 0.0 dBmV Downstream OFDM Channels Channel Lock Status 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 7.78 dBmV 45.5 dB 296 ~ 7895 82294164 17164821 0 2 Locked 0 ,1 ,2 ,3 160 918000000 Hz 7.18 dBmV 43.4 dB 2216 ~ 5975 82167677 11066105 34 Upstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked 11 ,13 6 36800000 Hz 31.0 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV Advice, assistance would be much appreciated.
