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Dustin1's avatar
Dustin1
New Contributor
3 years ago

Gigablast upload regularly dropping to 1.23Mbps, downloads range from 25Mbps up to 600Mbps. 10-15% packet loss off and on

I've been having intermittent problems over a year with packet loss and speeds. I was also having lots of uncorrectables but a tech came out last year, said they found something upstream and improved the situation. Still some packet loss and uncorrectables but not as bad. I was of course still charged the repair fee despite it being their issue and had to call to get that removed.

Although the situation was better it was still fairly bad so I bought a new cable modem, the Netgear CM1000, which somewhat improved the situation further, with reduced packet loss and uncorrectables. It's still not perfect like it used to be for 10 years up until a year ago.

A few weeks ago speeds began intermittently dropping to trash. Packet loss slightly increased. Occassionally I see massive spikes of uncorrectables but not often.

Sometimes it's slow download, sometimes slow upload, sometimes both. Sometimes speeds are okay besides packet loss.

As I write this I'm getting 445Mbps down, 1.23Mbps up. On Gigablast ("up to" 940Mbps down, 35Mbps up). Earlier in the day I was getting about 100Mbps down but 31Mbps up until afternoon.

Here's my cable modem about 30min after rebooting it to see if that helped (it did not).

Starting Frequency 807000000

<tabindex=-1>Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 807000000 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
Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 5 807000000 Hz 10.3 dBmV 42.3 dB 43795095 0 0
2 Locked QAM256 1 783000000 Hz 10.2 dBmV 42.2 dB 42856679 0 0
3 Locked QAM256 2 789000000 Hz 10.3 dBmV 42.3 dB 42860118 0 0
4 Locked QAM256 3 795000000 Hz 10.2 dBmV 42.3 dB 42863957 0 0
5 Locked QAM256 4 801000000 Hz 10.4 dBmV 42.3 dB 42867903 0 0
6 Locked QAM256 6 813000000 Hz 9.9 dBmV 42.3 dB 42871501 0 0
7 Locked QAM256 7 819000000 Hz 9.8 dBmV 42.1 dB 42874459 0 0
8 Locked QAM256 8 825000000 Hz 9.9 dBmV 42.3 dB 42877908 0 0
9 Locked QAM256 9 831000000 Hz 9.6 dBmV 42.2 dB 42881974 0 0
10 Locked QAM256 10 837000000 Hz 9.4 dBmV 41.9 dB 42886312 1 0
11 Locked QAM256 11 843000000 Hz 9.5 dBmV 42.0 dB 42889577 1 0
12 Locked QAM256 12 849000000 Hz 9.0 dBmV 41.8 dB 42893432 1 0
13 Locked QAM256 13 855000000 Hz 9.1 dBmV 41.8 dB 42897404 2 0
14 Locked QAM256 14 861000000 Hz 8.8 dBmV 41.6 dB 42900918 0 0
15 Locked QAM256 15 867000000 Hz 8.9 dBmV 41.6 dB 42904748 1 0
16 Locked QAM256 16 873000000 Hz 8.7 dBmV 41.6 dB 42907873 2 0
17 Locked QAM256 17 879000000 Hz 8.7 dBmV 41.6 dB 42911948 0 0
18 Locked QAM256 18 885000000 Hz 8.5 dBmV 41.6 dB 42915786 1 0
19 Locked QAM256 19 891000000 Hz 8.7 dBmV 41.7 dB 42919495 2 0
20 Locked QAM256 20 897000000 Hz 8.5 dBmV 41.6 dB 42923184 0 0
21 Locked QAM256 21 903000000 Hz 8.6 dBmV 41.5 dB 42926803 0 0
22 Locked QAM256 22 909000000 Hz 8.8 dBmV 41.6 dB 42930744 1 0
23 Locked QAM256 23 915000000 Hz 8.4 dBmV 41.5 dB 42934609 0 0
24 Locked QAM256 24 921000000 Hz 8.1 dBmV 41.4 dB 42938158 0 0
25 Locked QAM256 25 927000000 Hz 8.3 dBmV 41.4 dB 42941820 0 0
26 Locked QAM256 26 933000000 Hz 8.4 dBmV 41.4 dB 42945655 0 0
27 Locked QAM256 27 939000000 Hz 8.0 dBmV 41.2 dB 42949194 0 0
28 Locked QAM256 28 945000000 Hz 7.9 dBmV 41.2 dB 42952898 0 0
29 Locked QAM256 29 951000000 Hz 7.8 dBmV 41.0 dB 42956043 0 0
30 Locked QAM256 30 957000000 Hz 7.5 dBmV 40.8 dB 42960068 0 0
31 Locked QAM256 31 963000000 Hz 7.4 dBmV 40.9 dB 42962045 0 0
32 Locked QAM256 32 969000000 Hz 7.5 dBmV 40.8 dB 42961901 0 0

<tabindex=-1>Upstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 19300000 Hz 37.8 dBmV
2 Locked ATDMA 2 25800000 Hz 37.3 dBmV
3 Locked ATDMA 3 32200000 Hz 36.5 dBmV
4 Locked ATDMA 4 38600000 Hz 37.3 dBmV
5 Locked ATDMA 6 14500000 Hz 37.3 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
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, 2, 3 159 300000000 Hz 14.1 dBmV 43.5 dB 1108 ~ 2987 53705384 11623916 0
2 Not Locked 0 0 0 Hz 7.8 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>Upstream OFDMA Channels
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

Today's logs (replaced MAC addresses with xxx):

2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:41 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:41 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:36 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 2 3.;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:31 Notice (6) TLV-11 - unrecognized OID;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:31 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;

Netgear CM1000

Hardware Version 2.02
Firmware Version V6.01.07

1 Reply

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  • SharonL's avatar
    SharonL
    Former Moderator
    Hello Dustin,

    I am sorry to hear you are experiencing issues with your internet. This appears as if you may need someone to investigate your account personally. We would be able to assist you with this. Please reach us on Twitter at @CoxHelp, visit us on Facebook, or email us at cox.help@cox.com. Provide us the name on the account with the complete service address with a link to this thread so we can get started.

    Thank you.

    Sharon
    Cox Support Forum Moderator