I've seemingly had this issue ongoing since I moved in 2 years ago. Basically my upload speed crashes with no warning, I'll go from 30 Mbps up to 500 kbps and sometimes speedtests just time out. Initially I almost never received the full 30 Mbps but I've had a few in home techs as well as a plant technician assigned to the issue that alleviated problems. During all this, my download speed is never a factor, it always chugs along at 300 Mbps unfazed.
My house is a brand new build from October 2014. I'm the only owner of the house on a brand new street paved in early 2014. There are about 25 houses on the street altogether. Cox did the initial install the week I moved in, it was internet only, I've never had cable. So the drop to the house is only 2 years old, all the cabling in the house is two years old and there are no splitters at all. My PC is wired directly to the router but the problem exists even if I'm wired to the modem. Modem is a CM600 (after the SB6190 fiasco) and the router is a R7000.
After a few in home techs found nothing it was elevated to a plant technician who after a few weeks of looking was able to find noise in the line and clean it up. Took him a while because he said he couldn't find the problem unless it was actually happening at that moment. Since the problem has always been sporadic I was able to finally email him during one of the periods and he cleaned it up. Didn't tell me specifics, just that he cleaned up some noise.
I went a few months with no issues before it started to creep back again, at first barely noticeable but then seemingly for up to a 3rd of the day each day. Same process, same results. Cleaned up noise but he assured me it was a separate issue, not a reoccurence. Then this summer it happened again but that was apparently due to some flooded equipment from after hurricane Mathew.
Now it's happening again and it seems to be accelerating. I have been home all day and been able to see the upload speeds crash at least 3 times today. First notice it during online gaming but then it gets so bad at times that online browsing gets affected. But now I can tie everything back to T3 errors in the modem log. On my previous SB6190 I always got T3 errors, at least 5-6 a week but I was usually not noticing at the exact moment it started to happen so I could never see the direct connection between the errors and the upload crashes.
However, today I can predict almost to the minute when I'll see a T3 error in the modem log. My connection on my game grows laggy and I show up as a 'red bar'. Pull up the modem and within 5 minutes it will have a T3 error or two. I've also had two T4 errors and even my first T2 error today. Sometimes a modem reset clears it up, although that could just be the connection clearing up on its own.
Here's the logs just from the last few days in the modem:
2016-12-22, 17:58:55 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 17:50:20 Critical (3) REG RSP not received;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 17:50:17 Notice (6) TLV-11 - unrecognized OID;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 17:47:29 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 12:11:53 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 12:02:48 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 11:05:47 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 11:05:14 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 11:04:49 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 11:04:17 Critical (3) No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-22, 10:57:40 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-21, 18:29:32 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-21, 12:00:24 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-21, 11:53:24 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
2016-12-20, 14:32:16 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:87:b7:80;CMTS-MAC=e4:d3:f1:80:93:8a;CM-QOS=1.1;CM-VER=3.0;
And just to rule out other problems, here's my modem levels after a reboot:
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 53 837000000 Hz -1.6 dBmV 39.5 dB 1 0
2 Locked QAM256 49 813000000 Hz -1.5 dBmV 39.2 dB 1 0
3 Locked QAM256 50 819000000 Hz -1.4 dBmV 39.2 dB 2 0
4 Locked QAM256 51 825000000 Hz -1.4 dBmV 39.3 dB 1 0
5 Locked QAM256 52 831000000 Hz -1.5 dBmV 39.4 dB 1 0
6 Locked QAM256 54 843000000 Hz -2.1 dBmV 39.3 dB 0 0
7 Locked QAM256 55 849000000 Hz -2.5 dBmV 39.2 dB 2 0
8 Locked QAM256 56 855000000 Hz -2.8 dBmV 39.0 dB 2 0
9 Locked QAM256 57 861000000 Hz -3.0 dBmV 38.9 dB 3 0
10 Locked QAM256 58 867000000 Hz -3.3 dBmV 38.7 dB 10 0
11 Locked QAM256 59 873000000 Hz -3.2 dBmV 38.5 dB 2 0
12 Locked QAM256 60 879000000 Hz -3.3 dBmV 38.3 dB 5 0
13 Locked QAM256 61 885000000 Hz -3.3 dBmV 38.3 dB 2 0
14 Locked QAM256 62 891000000 Hz -3.6 dBmV 38.0 dB 4 0
15 Locked QAM256 63 897000000 Hz -3.4 dBmV 38.2 dB 0 0
16 Locked QAM256 64 903000000 Hz -3.3 dBmV 38.0 dB 3 0
17 Locked QAM256 65 909000000 Hz -3.0 dBmV 38.5 dB 0 0
18 Locked QAM256 66 915000000 Hz -2.4 dBmV 38.6 dB 0 0
19 Locked QAM256 67 921000000 Hz -1.9 dBmV 38.6 dB 0 0
20 Locked QAM256 68 927000000 Hz -1.5 dBmV 38.9 dB 0 0
21 Locked QAM256 69 933000000 Hz -1.2 dBmV 38.9 dB 0 0
22 Locked QAM256 70 939000000 Hz -0.9 dBmV 39.0 dB 0 0
23 Locked QAM256 71 945000000 Hz -1.5 dBmV 38.6 dB 0 0
24 Locked QAM256 72 951000000 Hz -2.1 dBmV 38.6 dB 0 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 28202000 Hz 42.5 dBmV
2 Locked TDMA and ATDMA 1 2560 Ksym/sec 20202000 Hz 39.3 dBmV
3 Locked TDMA and ATDMA 2 2560 Ksym/sec 23402000 Hz 41.0 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35102000 Hz 44.0 dBmV
So at this point I have to assume my issue is still noise in the upstream channels. But since it's been a sporadic issue over the last 2 years, I'm starting to think there is an underlying cause that isn't being fixed. I post here looking for guidance, first in confirming or correcting my assumption of what the problem is. And 2nd, to ask how should I address this with Cox? Calling support or using chat is useless, they confirm levels are ok, reset the modem and tell me to have a nice day. Since the problem isn't constant, it's next to impossible to actually speak to someone who knows what they are doing while it is happening, if they even have the ability to see what I'm talking about in their limited set of tools. I've been through the whole procedure of 3 in home techs and days off from work to have them tell me exactly what I already know, that the levels are ok and I shouldn't be having a problem. Not really interested in starting back at square one and reliving that whole experience unless I know it will lead to a permanent resolution.
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