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estesrc's avatar
estesrc
New Contributor II
5 years ago

Upgraded to Gigablast and can not get over 400Mbps

I upgraded to Gigablast on Saturday and i can not get a download speed greater then 400Mbps.

I have a Arris SB8200 modem, Linksys EA9300 router.

Desktop pc ( i7 4770k @3.5Ghz, 32GB ram, dual Samsung 860 EVO drives in raid 1.

Cell phone is a Samsung Note10+

When I first turned on the modem i was getting 350Mbps down and 10Mbps up max.  I Directly connected my computer to the modem and down load speed was tops 370 Mbps.  I have factory reset the modem and i started to get speeds closer to 400Mbps down and the upload jumped to 35Mbps+.

I ran "netsh int tcp set global autotuninglevel=normal" as i read in another post that this can cause issues or at least show slowness but my speeds did not change at all.

this is the most recent speed test https://www.speedtest.net/result/8795489429  I also use the speedtest.com app on my phone (wanted to eliminate that its just my pc) and it is getting the same results.

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 957000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
30 Locked QAM256 957000000 Hz 5.5 dBmV 40.0 dB 38 0
1 Locked QAM256 783000000 Hz 7.8 dBmV 40.5 dB 5 0
2 Locked QAM256 789000000 Hz 8.0 dBmV 40.7 dB 7 0
3 Locked QAM256 795000000 Hz 7.7 dBmV 40.5 dB 10 0
4 Locked QAM256 801000000 Hz 8.1 dBmV 40.6 dB 12 0
9 Locked QAM256 831000000 Hz 7.1 dBmV 40.0 dB 36 0
10 Locked QAM256 837000000 Hz 6.9 dBmV 39.7 dB 50 0
11 Locked QAM256 843000000 Hz 7.1 dBmV 39.9 dB 35 0
12 Locked QAM256 849000000 Hz 6.9 dBmV 39.8 dB 66 0
17 Locked QAM256 879000000 Hz 7.3 dBmV 40.2 dB 41 0
18 Locked QAM256 885000000 Hz 7.0 dBmV 39.9 dB 64 0
19 Locked QAM256 891000000 Hz 7.2 dBmV 40.2 dB 31 0
20 Locked QAM256 897000000 Hz 7.3 dBmV 39.9 dB 59 0
21 Locked QAM256 903000000 Hz 7.1 dBmV 39.9 dB 41 0
22 Locked QAM256 909000000 Hz 6.7 dBmV 39.9 dB 38 0
25 Locked QAM256 927000000 Hz 6.4 dBmV 40.0 dB 22 0
26 Locked QAM256 933000000 Hz 6.3 dBmV 40.1 dB 42 0
27 Locked QAM256 939000000 Hz 6.0 dBmV 40.2 dB 24 0
28 Locked QAM256 945000000 Hz 5.8 dBmV 40.0 dB 36 0
29 Locked QAM256 951000000 Hz 5.6 dBmV 40.1 dB 21 0
33 Locked QAM256 357000000 Hz 4.1 dBmV 39.5 dB 0 0
34 Locked QAM256 363000000 Hz 4.2 dBmV 39.8 dB 0 0
35 Locked QAM256 369000000 Hz 4.2 dBmV 39.8 dB 0 0
36 Locked QAM256 375000000 Hz 4.1 dBmV 39.8 dB 0 0
37 Locked QAM256 381000000 Hz 4.4 dBmV 39.8 dB 0 0
38 Locked QAM256 387000000 Hz 4.4 dBmV 39.9 dB 0 0
41 Locked QAM256 405000000 Hz 4.6 dBmV 39.8 dB 0 0
42 Locked QAM256 411000000 Hz 4.8 dBmV 39.9 dB 0 0
43 Locked QAM256 417000000 Hz 4.6 dBmV 39.8 dB 0 0
44 Locked QAM256 423000000 Hz 5.0 dBmV 39.9 dB 0 0
45 Locked QAM256 429000000 Hz 4.8 dBmV 39.9 dB 0 0
46 Locked QAM256 435000000 Hz 5.1 dBmV 40.0 dB 0 0
159 Locked Other 300000000 Hz 7.1 dBmV 41.0 dB 521654394 0




Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 3 Locked SC-QAM Upstream 29900000 Hz 6400000 Hz 43.0 dBmV
2 1 Locked SC-QAM Upstream 16900000 Hz 6400000 Hz 41.0 dBmV
3 2 Locked SC-QAM Upstream 23500000 Hz 6400000 Hz 42.0 dBmV
4 4 Locked SC-QAM Upstream 36300000 Hz 6400000 Hz 43.0 dBmV



Any help on this would be appreciated.  If I need to have a tech come out and test the line let me know.

12 Replies

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  • Zurq's avatar
    Zurq
    Contributor II
    5 years ago

    from my analysis, the downstream looks a little wonky.

    • Bruce's avatar
      Bruce
      Honored Contributor III
      5 years ago

      How is the downstream wonky?

      • Zurq's avatar
        Zurq
        Contributor II
        5 years ago

        wait i was looking at the wrong thing lmao, nevermind they are within the -7 to +7 dBmV. I was looking at the SNR for some reason lmao.

  • Zurq's avatar
    Zurq
    Contributor II
    5 years ago

    and it might be the modem, is the modem able to get those speeds? and do you have a router that can give gigabit speeds?

    • estesrc's avatar
      estesrc
      New Contributor II
      5 years ago

      The modem is the Arris SB8200 as stated in the original post and a supported Gigablast modem by Cox.  The router supports gigabit ethernet wired, and up to 4Gbps wifi.

  • JonathanJ's avatar
    JonathanJ
    Former Moderator
    5 years ago
    @estesrc

    We can check the signal level to see if they're in range just email the full-service address and name to cox.help@cox.com.


    Jonathan J
    Cox Moderator
  • YourBoyJoe's avatar
    YourBoyJoe
    New Contributor
    5 years ago

    I've had gigablast for almost a year now and have never seen much more than 700mbps. More often I get ~4-500 mpbs. I don't understand why they call it gigablast but I wish they (and other providers) didn't collude to segment markets and create regional monopolies so that we would have alternatives.

    • Zurq's avatar
      Zurq
      Contributor II
      5 years ago

      keyword "UP TO 940mbps"

    • Allan's avatar
      Allan
      Moderator
      5 years ago
      @YourBoyJoe, Your modem is up and running with a good signal and I do not see any unusual latency to the modem at this time. Are you experiencing this issue with multiple devices or just this one? Also, are you using a wireless or wired connection? -Allan. Cox Support Forums Moderator.