I have had Xfinity service in my home since July 2020 and have been having issues ever since. I have a BRAND NEW Docsis 3.1 Netgear CM1200 that constantly times out, loses packets (20-100%), and disconnects entirely for minutes at a time. I am directly connected to my PC, I have also tried with a router, to no avail. I have had a line tech out and a tech in the house who both said the problem was the modem. But replacing it wouldn't help and that the issue could be resolved by Xfinity techs, just not them.... I have tried using my 2 year old Docsis 3.0 Netgear modem and it works just fine, except I pay for gigabit service and need a 3.1 to get the speeds I'm paying for. Why does Xfinity put their logo on the box of this product if it isn't supported and techs can't fix it??? Occassionally the upstream light on my modem will flash also as if it is unable to lock. Further there are times when I only have 1 upstream bonded channel in my modem GUI. I would assume this was a problem with my specific modem had I not read about posts as recent as today with people who have the same modem and same problem. This is either a firmware issue, or a configuration problem that needs to be remedied.
Cable Connection
| | | | Apply Cancel | | Frequency start Value | | This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. | |
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| Startup Procedure |
| Procedure | Status | Comment | | Acquire Downstream Channel | 405000000 Hz | Locked | | Connectivity State | OK | Operational | | Boot State | OK | Operational | | Security | Enabled | BPI+ | | IP Provisioning Mode | Honor MDD | honorMdd(4) |
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| Downstream Bonded Channels |
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Correctables | Uncorrectables | | 1 | Locked | QAM256 | 1 | 405000000 Hz | 13.6 dBmV | 40.8 dB | 0 | 0 | | 2 | Locked | QAM256 | 2 | 411000000 Hz | 13.7 dBmV | 40.8 dB | 0 | 0 | | 3 | Locked | QAM256 | 3 | 417000000 Hz | 13.6 dBmV | 40.8 dB | 0 | 0 | | 4 | Locked | QAM256 | 4 | 423000000 Hz | 13.7 dBmV | 40.7 dB | 0 | 0 | | 5 | Locked | QAM256 | 5 | 429000000 Hz | 13.9 dBmV | 40.7 dB | 0 | 0 | | 6 | Locked | QAM256 | 6 | 435000000 Hz | 14.3 dBmV | 40.8 dB | 0 | 0 | | 7 | Locked | QAM256 | 7 | 441000000 Hz | 14.2 dBmV | 40.6 dB | 0 | 0 | | 8 | Locked | QAM256 | 8 | 453000000 Hz | 12.8 dBmV | 40.2 dB | 0 | 0 | | 9 | Locked | QAM256 | 9 | 459000000 Hz | 13 dBmV | 40.2 dB | 0 | 0 | | 10 | Locked | QAM256 | 10 | 465000000 Hz | 13.2 dBmV | 40.3 dB | 0 | 0 | | 11 | Locked | QAM256 | 11 | 471000000 Hz | 13.1 dBmV | 40.2 dB | 0 | 0 | | 12 | Locked | QAM256 | 12 | 477000000 Hz | 13.2 dBmV | 40.1 dB | 0 | 0 | | 13 | Locked | QAM256 | 13 | 483000000 Hz | 13.2 dBmV | 40.1 dB | 0 | 0 | | 14 | Locked | QAM256 | 14 | 489000000 Hz | 13.3 dBmV | 40.1 dB | 0 | 0 | | 15 | Locked | QAM256 | 15 | 495000000 Hz | 13.3 dBmV | 40.1 dB | 0 | 0 | | 16 | Locked | QAM256 | 16 | 501000000 Hz | 13.4 dBmV | 40.1 dB | 0 | 0 | | 17 | Locked | QAM256 | 17 | 507000000 Hz | 13.6 dBmV | 40.1 dB | 0 | 0 | | 18 | Locked | QAM256 | 18 | 513000000 Hz | 13.6 dBmV | 40 dB | 0 | 0 | | 19 | Locked | QAM256 | 19 | 519000000 Hz | 13.6 dBmV | 40 dB | 0 | 0 | | 20 | Locked | QAM256 | 20 | 525000000 Hz | 13.7 dBmV | 40.1 dB | 0 | 0 | | 21 | Locked | QAM256 | 21 | 531000000 Hz | 13.6 dBmV | 40 dB | 0 | 0 | | 22 | Locked | QAM256 | 22 | 537000000 Hz | 13.6 dBmV | 39.9 dB | 0 | 0 | | 23 | Locked | QAM256 | 23 | 543000000 Hz | 13.5 dBmV | 39.9 dB | 0 | 0 | | 24 | Locked | QAM256 | 24 | 549000000 Hz | 13.2 dBmV | 39.7 dB | 0 | 0 | | 25 | Locked | QAM256 | 25 | 555000000 Hz | 13.2 dBmV | 39.7 dB | 0 | 0 | | 26 | Locked | QAM256 | 26 | 561000000 Hz | 13.2 dBmV | 39.6 dB | 0 | 0 | | 27 | Locked | QAM256 | 27 | 567000000 Hz | 13.1 dBmV | 39.5 dB | 0 | 0 | | 28 | Locked | QAM256 | 28 | 573000000 Hz | 13 dBmV | 39.4 dB | 0 | 0 | | 29 | Locked | QAM256 | 29 | 579000000 Hz | 12.9 dBmV | 39.4 dB | 0 | 0 | | 30 | Locked | QAM256 | 30 | 585000000 Hz | 13.1 dBmV | 39.3 dB | 0 | 0 | | 31 | Locked | QAM256 | 31 | 591000000 Hz | 13.1 dBmV | 39.3 dB | 0 | 0 | | 32 | Locked | QAM256 | 32 | 597000000 Hz | 13.5 dBmV | 39.3 dB | 0 | 0 |
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| Upstream Bonded Channels |
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power | | 1 | Locked | ATDMA | 1 | 5120 Ksym/sec | 35600000 Hz | 45 dBmV | | 2 | Locked | ATDMA | 2 | 5120 Ksym/sec | 29200000 Hz | 45.5 dBmV | | 3 | Locked | ATDMA | 3 | 5120 Ksym/sec | 22800000 Hz | 44 dBmV | | 4 | Locked | ATDMA | 4 | 5120 Ksym/sec | 16400000 Hz | 43.5 dBmV | | 5 | Locked | ATDMA | 5 | 1280 Ksym/sec | 39600000 Hz | 49.5 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 |
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| 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 | 159 | 690000000 Hz | 14.4 dBmV | 39.0 dB | 1246 ~ 2849 | 33732510 | 4016984 | 0 | | 2 | Not Locked | 0 | 0 | 0 Hz | 0 dBmV | 0.0 dB | 0 ~ 4095 | 0 | 0 | 0 |
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| 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 |
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| Extended Upstream Transmit Power |
| Enable Extended Upstream Transmit Power |
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| Current System Time:Mon Aug 17 16:59:03 2020 |
| System Up Time:00:16:46 |
Responses
Manta_Rai
Contributor
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21 Messages
7 m ago
Same issue here, but with difference cable modems AND the Xfinity XB7 gateway. You aren't alone. My story here if you want to read it - https://forums.xfinity.com/t5/Your-Home-Network/Major-Internet-Issues-Any-Ideas/td-p/3375432
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johnsoat4
Frequent Visitor
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5 Messages
7 m ago
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