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CM1100 Modem Not All Channels Active "Partial Service" (COX) Gig Service
Modem: Nighthawk CM1100
Router: Nighthawk RAX80
Hi,
I have Cox gigbit service but I only get around 630mbps max (sometimes 590mbps). I logged into my CM1100 modem and it says that the Downstream Bonded Channel (Partial Service) - only channels locked are 1 - 20 (out of 32), and the rest of the channels are unlocked at 0 values. On the Uploadstream - Channels 1 - 5 (out of 8) are the only ones locked. Detailed log below.
I called called Cox Communications and they said that "everything is fine on our end", and that it must be a defective modem but not on their end. Any ideas???
|
<tabindex=-1>Startup Procedure</tabindex=-1>
| Procedure | Status | Comment |
| Acquire Downstream Channel | 957000000 Hz | Locked |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Security | Enable | BPI+ |
| IP Provisioning Mode | Honor MDD | IPv4 only |
<tabindex=-1>Downstream Bonded Channels (Partial Service)</tabindex=-1>
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR / MER | Unerrored Codewords | Correctable Codewords | Uncorrectable Codewords |
| 1 | Locked | QAM256 | 30 | 957000000 Hz | 16.2 dBmV | 41.1 dB | 190805348 | 12 | 0 |
| 2 | Locked | QAM256 | 1 | 783000000 Hz | 12.5 dBmV | 40.2 dB | 188844156 | 450 | 0 |
| 3 | Locked | QAM256 | 2 | 789000000 Hz | 12.7 dBmV | 40.3 dB | 188847544 | 502 | 0 |
| 4 | Locked | QAM256 | 3 | 795000000 Hz | 12.6 dBmV | 40.2 dB | 188851159 | 438 | 0 |
| 5 | Locked | QAM256 | 4 | 801000000 Hz | 12.7 dBmV | 40.3 dB | 188855523 | 454 | 0 |
| 6 | Locked | QAM256 | 9 | 831000000 Hz | 13.3 dBmV | 40.4 dB | 188859281 | 475 | 0 |
| 7 | Locked | QAM256 | 10 | 837000000 Hz | 13.6 dBmV | 40.5 dB | 188863165 | 430 | 0 |
| 8 | Locked | QAM256 | 11 | 843000000 Hz | 14.1 dBmV | 40.9 dB | 188868010 | 281 | 0 |
| 9 | Locked | QAM256 | 12 | 849000000 Hz | 14.2 dBmV | 40.7 dB | 188872380 | 298 | 0 |
| 10 | Locked | QAM256 | 17 | 879000000 Hz | 15.5 dBmV | 41.0 dB | 188876375 | 207 | 0 |
| 11 | Locked | QAM256 | 18 | 885000000 Hz | 16.0 dBmV | 41.1 dB | 188879973 | 130 | 0 |
| 12 | Locked | QAM256 | 19 | 891000000 Hz | 16.1 dBmV | 40.9 dB | 188883908 | 128 | 0 |
| 13 | Locked | QAM256 | 20 | 897000000 Hz | 16.6 dBmV | 41.3 dB | 188887960 | 83 | 0 |
| 14 | Locked | QAM256 | 21 | 903000000 Hz | 16.9 dBmV | 41.5 dB | 188891762 | 66 | 0 |
| 15 | Locked | QAM256 | 22 | 909000000 Hz | 16.6 dBmV | 41.1 dB | 188895231 | 99 | 0 |
| 16 | Locked | QAM256 | 25 | 927000000 Hz | 17.0 dBmV | 41.3 dB | 188899048 | 50 | 0 |
| 17 | Locked | QAM256 | 26 | 933000000 Hz | 16.8 dBmV | 41.4 dB | 188902918 | 34 | 0 |
| 18 | Locked | QAM256 | 27 | 939000000 Hz | 16.8 dBmV | 41.4 dB | 188907079 | 34 | 0 |
| 19 | Locked | QAM256 | 28 | 945000000 Hz | 16.6 dBmV | 41.2 dB | 188910266 | 25 | 0 |
| 20 | Locked | QAM256 | 29 | 951000000 Hz | 16.4 dBmV | 41.3 dB | 188912406 | 21 | 0 |
| 21 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 22 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 23 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 24 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 25 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 26 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 27 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 28 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 29 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 30 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 31 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 32 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power |
| 1 | Locked | ATDMA | 1 | 19400000 Hz | 40.0 dBmV |
| 2 | Locked | ATDMA | 2 | 25800000 Hz | 40.3 dBmV |
| 3 | Locked | ATDMA | 3 | 32200000 Hz | 40.0 dBmV |
| 4 | Locked | ATDMA | 4 | 38600000 Hz | 41.0 dBmV |
| 5 | Locked | ATDMA | 6 | 14600000 Hz | 39.8 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 |
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
| 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, 255 | 159 | 300000000 Hz | -39.4 dBmV | 0.0 dB | 0 ~ 4095 | 0 | 0 | 0 |
| 2 | Not Locked | 0, 255 | 0 | 0 Hz | -39.2 dBmV | 0.0 dB | 0 ~ 4095 | 0 | 0 | 0 |
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
| Channel | Lock Status | Modulation / Profile ID | Channel ID | Frequency | Power |
| 1 | Not Locked | Unknown | 0 | 0 Hz | 0 dBmV |
| 2 | Not Locked | Unknown | 0 | 0 Hz | 0 dBmV |
- So here is an update and solution.
After calling several times to convince my cable company to make a house call, they finally did. It turns out the cabling in my house was fine. The problem was that they had a "channel filter" device on their outside cable line. It took a few weeks for them to come back with a bucket lift so the they could reach the top of the near by utility pole to remove it. The tech told me they had installed those channel filters a few years back so they can block people from "stealing" or accessing and viewing cable channels from internet-only cable subscribers. But now with Gigbit internet service those same channel filters also block modem channels making internet signals unstable and slow. When I log in to my modem, it now shows it firing on all cylinders (channels). I'm a happy camper. Thanks you all.
10 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.
Be sure to power OFF the modem for 1 minute them back ON.Another thing to check is your downstream signal is kind of high powered. Ideal is -7dbmv to +7dbmv. You're at 16.9dbmv.
Usually I recommend removing splitters but sometimes it can actually help if you have a good quality splitter to drop your signal a bit.
Or using a signal attenuator.
If you get it into a decent range, then reboot the modem and see what locks. They don't all have to lock provided you get the full speed you pay for. If you're not getting the full speed after getting your signal corrected, I'd follow what FURRYe38 recommends and have the isp check the line.
- Thanks guys. I will be trying all suggestions. By the way, I did see that there is a cylindrical extension type adapter when I checked the cable outside, maybe that might help if I replace it. Also, I was trying if the cable is the new type of high bandwidth cable but it doesn't have writing on it, its only white. The house is older so I wouldn't be surprised if even the cable running from their box down the street to our house was older. Now to convince them to make a house call.
Thanks again.
