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Forum Discussion
behshad
Aug 31, 2020Tutor
Netgear CM1200 losing Internet connectivity on a daily basis
CM1200 model is losing Internet connections on a daily basis. Using Comcast Gig service. Rebooting the modem establish the connectivity back immediate but it has become a cumbersome rebooting the model constantly. When the modem is up and running, the connection throughput is excellent and reserving almost almost a gig for download and 40 for upload. Confirmed Firmware Version V2.02.05 for Comcast Xfinity service. Also tried resetting the modem with no success. Called Xfinity many times but their technical support is clueless on what's going on. They sent a rep onsite to put new connector on the coax line but the modem works great until it loses connection and must be rebooted. Please let me know if anyone else seen this issue or recommend any troubleshooting. Startup Procedure Procedure Status Comment Acquire Downstream Channel 525000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4) Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 20 525000000 Hz 1.2 dBmV 40.8 dB 7 32 2 Locked QAM256 17 507000000 Hz 1.7 dBmV 40.4 dB 0 0 3 Locked QAM256 18 513000000 Hz 1.6 dBmV 40.9 dB 0 0 4 Locked QAM256 19 519000000 Hz 1.4 dBmV 40.9 dB 0 0 5 Locked QAM256 21 531000000 Hz 1.4 dBmV 40.9 dB 0 0 6 Locked QAM256 22 537000000 Hz 1.5 dBmV 41.1 dB 0 0 7 Locked QAM256 23 543000000 Hz 1.4 dBmV 41.1 dB 1 0 8 Locked QAM256 24 549000000 Hz 1.3 dBmV 40.8 dB 0 0 9 Locked QAM256 25 555000000 Hz 1 dBmV 39.9 dB 0 0 10 Locked QAM256 26 561000000 Hz 1 dBmV 40.2 dB 0 0 11 Locked QAM256 27 567000000 Hz 1.3 dBmV 40.6 dB 0 0 12 Locked QAM256 28 573000000 Hz 1.5 dBmV 40.8 dB 0 0 13 Locked QAM256 29 579000000 Hz 1.2 dBmV 40.6 dB 0 0 14 Locked QAM256 30 585000000 Hz 0.6 dBmV 40.3 dB 1 0 15 Locked QAM256 31 591000000 Hz 0.4 dBmV 40.1 dB 0 0 16 Locked QAM256 32 597000000 Hz 0.5 dBmV 40.4 dB 0 0 17 Locked QAM256 33 603000000 Hz 1.2 dBmV 39.7 dB 0 0 18 Locked QAM256 34 609000000 Hz 1.2 dBmV 40.5 dB 0 0 19 Locked QAM256 35 615000000 Hz 0.8 dBmV 40.4 dB 0 0 20 Locked QAM256 36 621000000 Hz 0.6 dBmV 40.1 dB 0 0 21 Locked QAM256 37 627000000 Hz 0.8 dBmV 40.1 dB 0 0 22 Locked QAM256 38 633000000 Hz 1.2 dBmV 40.4 dB 0 0 23 Locked QAM256 39 639000000 Hz 1.6 dBmV 40.6 dB 0 0 24 Locked QAM256 40 645000000 Hz 1.4 dBmV 40.4 dB 0 0 25 Locked QAM256 41 651000000 Hz 0.8 dBmV 40 dB 0 0 26 Locked QAM256 42 657000000 Hz 0.7 dBmV 40 dB 0 0 27 Locked QAM256 43 663000000 Hz 1.2 dBmV 40.1 dB 0 0 28 Locked QAM256 44 669000000 Hz 1.5 dBmV 40.3 dB 0 0 29 Locked QAM256 45 675000000 Hz 1.8 dBmV 39.8 dB 0 0 30 Locked QAM256 46 681000000 Hz 1.5 dBmV 40 dB 0 0 31 Locked QAM256 47 687000000 Hz 1.4 dBmV 39.9 dB 0 0 32 Not Locked Unknown 0 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 61 5120 Ksym/sec 17300000 Hz 45.8 dBmV 2 Locked ATDMA 62 5120 Ksym/sec 23700000 Hz 46.8 dBmV 3 Locked ATDMA 63 5120 Ksym/sec 30300000 Hz 47.8 dBmV 4 Locked ATDMA 64 5120 Ksym/sec 36700000 Hz 48 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 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 ,1 ,2 ,3 48 850000000 Hz -2.9 dBmV 38.1 dB 1108 ~ 2987 8587814 7073625 0 2 Not Locked 0 0 0 Hz 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 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV Extended Upstream Transmit Power Enable Extended Upstream Transmit Power
11 Replies
- plemansGuru - Experienced User
Take a screen snip of that cable connection page and the logs. its easier to read. are you using wan appregation? if so, disable it.
- plemansGuru - Experienced User
You need the whole page with signal values, uncorrectables, upstream/downstream.
- behshadTutor
Not using bandwidth agregation. See Snip screenshots of model status and log.
Netgear CM1200 port 1 is connecting to Netgear RAX 120 using Internet port.
- FURRYe38Guru - Experienced User
Does the modem loose connection with out the router attached? Connect a wired PC to the modem directly.
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.
Be sure to power OFF the modem for 1 minute them back ON.
behshad wrote:Not using bandwidth agregation. See Snip screenshots of model status and log.
Netgear CM1200 port 1 is connecting to Netgear RAX 120 using Internet port.