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Slow Upload With Disconnects
Hi,
I live just outside D.C. in Northern VA. My upload speed hits 20+ Mbps when things are working well, but plummets to 1 Mbps and below very often. While this slowness is going on, there are spikes of slowness so low as to disconnect entirely from whatever I'm uploading.
My modem is a brand new Arris SB6183. It is connected directly to my computer via new ethernet. The modem is connected to my wall by a brand new cable. Inside my maintenance closet is a 1:3 splitter with caps on 2 of the outputs. The 3rd output says 5.5 db and connects to my apartment wall.
Technicians have noted T3 errors and bad MER/BER ratings in past visits.
Here's a snapshot of my modem event log and stream status for debugging purposes. Please let me know what you think!
The first error happens very frequently.
| Time | Priority | Description |
|---|---|---|
| Sat Feb 27 12:54:02 2016 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 27 05:03:18 2016 | Error (4) | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 27 04:29:51 2016 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Fri Feb 26 17:03:18 2016 | Error (4) | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Fri Feb 26 16:43:16 2016 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Fri Feb 26 05:04:03 2016 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.1;CM-VER=3.0; |
| Time Not Established | Warning (5) | DHCP WARNING - Non-critical field invalid in response ;CM-MAC=20:3d:66:9b:31:14;CMTS-MAC=50:57:a8:89:7d:9d;CM-QOS=1.0;CM-VER=3.0; |
| Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv4 |
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out |
| Downstream Bonded Channels | ||||||||
|---|---|---|---|---|---|---|---|---|
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Corrected | Uncorrectables |
| 1 | Locked | QAM256 | 85 | 795000000 Hz | 1.1 dBmV | 39.3 dB | 5824 | 1624 |
| 2 | Locked | QAM256 | 86 | 801000000 Hz | 1.2 dBmV | 39.3 dB | 5640 | 951 |
| 3 | Locked | QAM256 | 87 | 807000000 Hz | 0.9 dBmV | 39.4 dB | 5266 | 871 |
| 4 | Locked | QAM256 | 88 | 813000000 Hz | 0.6 dBmV | 39.5 dB | 5513 | 683 |
| 5 | Locked | QAM256 | 89 | 819000000 Hz | 0.0 dBmV | 39.3 dB | 5618 | 834 |
| 6 | Locked | QAM256 | 90 | 825000000 Hz | 0.5 dBmV | 39.1 dB | 5760 | 746 |
| 7 | Locked | QAM256 | 91 | 831000000 Hz | 0.4 dBmV | 38.1 dB | 6276 | 1010 |
| 8 | Locked | QAM256 | 92 | 837000000 Hz | 0.3 dBmV | 37.4 dB | 6491 | 1677 |
| 9 | Locked | QAM256 | 93 | 843000000 Hz | -0.3 dBmV | 36.8 dB | 6447 | 1290 |
| 10 | Locked | QAM256 | 94 | 849000000 Hz | 0.2 dBmV | 37.0 dB | 6267 | 1503 |
| 11 | Locked | QAM256 | 95 | 855000000 Hz | -0.3 dBmV | 36.8 dB | 6431 | 1726 |
| 12 | Locked | QAM256 | 96 | 861000000 Hz | 0.2 dBmV | 36.7 dB | 6497 | 2205 |
This is probably the section I care about most, since upload shows the most symptoms:
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
| 1 | Locked | ATDMA | 3 | 5120 Ksym/sec | 26000000 Hz | 38.9 dBmV |
| 2 | Locked | TDMA and ATDMA | 1 | 2560 Ksym/sec | 17800000 Hz | 39.0 dBmV |
| 3 | Locked | TDMA and ATDMA | 2 | 2560 Ksym/sec | 21100000 Hz | 39.0 dBmV |
| 4 | Locked | ATDMA | 4 | 5120 Ksym/sec | 32500000 Hz | 40.5 dBmV |
ChrisL
Former Moderator
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Looking from this end I don't see anything that would explain the problems you're experiencing. Is there another computer you can try connecting to the modem to see if you still have the same problem?
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Kanis999
New Contributor
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Hi,
Thanks for your reply. Yes, every computer I've used has the problem. Is there any kind of throttling of upload speeds? It seems very 'bursty' with sustained speeds being much slower. Does general traffic in the local area become overwhelming for the network? I am seeing a high number of Cox problems reported on internet forums nationwide this week and am wondering if the network is experiencing some kind of general problem I should be aware of.
Right now I'm clocking 1.8 Mbps on speedtest.net which is 10% what it normally is. Almost every time I test it it is a radically different speed ranging from 1-35 Mbps at the highest. See how this download chart peaks and valleys all over the place?
Will post another snapshot of bonded channels in case something changed:
The funny thing is I actually rescheduled a technician visit that would have happened today because in the hour before he came uploads speeds were good for the first time in weeks. It had appeared the problem was finally fixed in the morning but it returned full force almost immediately after my tech visit was rescheduled.
Thanks,
Mike
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ChrisL
Former Moderator
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We advertise the speeds as being up to speeds due to demand variables not entirely under our control however we're happy to see how we can help still. If you're experiencing problems with multiple devices connected directly to the modem having a tech come out and investigate is a good next step.
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Kanis999
New Contributor
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The upload connectivity was solid today for about 8 hours (first time in weeks), but it has returned to garbage performance. If that gives any clues.
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