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Homey's avatar
Homey
New Contributor
4 years ago
Solved

Gigablast Poor Download Speeds

I upgraded to Cox Gigablast a couple of weeks ago and have not yet been able achieve download speeds greater than 200mbps-250mbps. Upload speeds are fine at 35mbps. I have tried modem reboots and factory resets, and even a reactivation today. Nothing seems to get the speeds up. The modem is connected directly to the main cable drop, no splitters. The Modem is an Arris SB8200. 

While all of 32 channels are locked, the first 20 are locked close to the Downstream 957MHz from Cox  while the last 12 are all locked at frequencies about half of 957MHz. Is that part of the problem? I feel like that would reduce the capability of the downstream channels. Sorry if a dumb question.

Thanks in advance for any assistance.

Here is current status of the Downstream Bonded Channels. The OFDM channel is #159 at only 348Mhz:

Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
30 Locked QAM256 957000000 Hz 9.6 dBmV 40.2 dB 0 0
1 Locked QAM256 783000000 Hz 9.0 dBmV 40.6 dB 0 0
2 Locked QAM256 789000000 Hz 8.9 dBmV 40.7 dB 0 0
3 Locked QAM256 795000000 Hz 8.9 dBmV 40.6 dB 0 0
4 Locked QAM256 801000000 Hz 9.0 dBmV 40.5 dB 0 0
9 Locked QAM256 831000000 Hz 9.2 dBmV 40.2 dB 0 0
10 Locked QAM256 837000000 Hz 9.1 dBmV 40.5 dB 0 0
11 Locked QAM256 843000000 Hz 9.2 dBmV 40.2 dB 0 0
12 Locked QAM256 849000000 Hz 9.4 dBmV 40.1 dB 0 0
17 Locked QAM256 879000000 Hz 9.2 dBmV 40.0 dB 0 0
18 Locked QAM256 885000000 Hz 9.0 dBmV 39.8 dB 0 0
19 Locked QAM256 891000000 Hz 9.1 dBmV 40.1 dB 0 0
20 Locked QAM256 897000000 Hz 9.2 dBmV 39.8 dB 0 0
21 Locked QAM256 903000000 Hz 9.2 dBmV 39.8 dB 0 0
22 Locked QAM256 909000000 Hz 9.2 dBmV 39.9 dB 0 0
25 Locked QAM256 927000000 Hz 9.6 dBmV 39.6 dB 0 0
26 Locked QAM256 933000000 Hz 9.4 dBmV 40.2 dB 0 0
27 Locked QAM256 939000000 Hz 9.7 dBmV 40.2 dB 0 0
28 Locked QAM256 945000000 Hz 9.7 dBmV 40.0 dB 0 0
29 Locked QAM256 951000000 Hz 9.6 dBmV 40.0 dB 0 0
33 Locked QAM256 405000000 Hz 6.8 dBmV 40.9 dB 0 0
34 Locked QAM256 411000000 Hz 6.8 dBmV 41.0 dB 0 0
35 Locked QAM256 417000000 Hz 6.7 dBmV 40.9 dB 0 0
36 Locked QAM256 423000000 Hz 7.1 dBmV 41.2 dB 0 0
37 Locked QAM256 429000000 Hz 7.2 dBmV 41.1 dB 0 0
38 Locked QAM256 435000000 Hz 7.2 dBmV 41.1 dB 0 0
41 Locked QAM256 453000000 Hz 7.6 dBmV 41.0 dB 0 0
42 Locked QAM256 459000000 Hz 7.6 dBmV 41.1 dB 0 0
43 Locked QAM256 465000000 Hz 7.7 dBmV 41.1 dB 0 0
44 Locked QAM256 471000000 Hz 7.9 dBmV 41.4 dB 0 0
45 Locked QAM256 477000000 Hz 7.9 dBmV 41.5 dB 0 0
46 Locked QAM256 483000000 Hz 7.7 dBmV 41.2 dB 0 0
159 Locked Other 348000000 Hz 9.3 dBmV 41.8 dB 98439200 0
  • Thank you for responding! I'm pretty novice here so I didn't really follow the discussion on the link, but I think its saying that the SB6183 prioritizes higher SNRs. So, while the SB6183 biases to high frequencies, it will pull in lower frequencies as needed if the SNRs are comparatively higher until all 32 channels are bound? 

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    • Homey's avatar
      Homey
      New Contributor

      Thank you for responding! I'm pretty novice here so I didn't really follow the discussion on the link, but I think its saying that the SB6183 prioritizes higher SNRs. So, while the SB6183 biases to high frequencies, it will pull in lower frequencies as needed if the SNRs are comparatively higher until all 32 channels are bound? 

      • CPGuy's avatar
        CPGuy
        New Contributor II

        Contact Arris and here are the results. Going back to Cox:

        We already received and checked the file your sent to us, this device work with 32 downstream channels to reach 1 Gbps speed, however, your internet provider is pushing out 33 channels, which is not good,  this will negatively affect the overall performance of the unit, Also, we recommend to have the downstream power levels as closest as zero to have a better performance.

        Upstream channels are out of range, power levels must be in between 45 to 51. Yours are not reaching the minimum. We do suggest you to perform a factory reset on your SB8200, then, contact your internet service provider to adjust the cable levels.


        This link will show you the steps to perform a factory reset:

        http://arris.force.com/consumers/articles/General_FAQs/SB8200-Factory-Reset