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Forum Discussion
Slow Upload Speeds Question
So I am on Xfinity's 1200Mbps download and 200Mbps Upload and I just installed my CAX80 today. When connected to Ethernet, I get close to 1Gbps, but my upload is stuck around 30 to 40Mbps. When I had...
Ethernet Devices:
Netgear 5-Port Multi-Gigabit Ethernet Unmanaged Network Switch (MS305)
Cat 6 Cables (Under 3 Feet)
Speed Test Site:
speedtest.net
Channel Configs:
2.4Ghz: Auto
5Ghz: Channel 36
Smart Connect: Off
MIMO: On
Beamforming: On
OFDMA: Off
Air Time Fairness: Off
Here is the Modem Status:
Cable Diagnostic
Status: Good
Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
Internet Access: Good
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Mon Jan 08 13:53:38 2024
Startup Procedure
Acquire Downstream Channel: 435 MHz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked 256 QAM 4 435000000 Hz -1.1 dBmV 46 dB 0 0
2 Locked 256 QAM 1 417000000 Hz -1 dBmV 46.3 dB 0 0
3 Locked 256 QAM 2 423000000 Hz -1 dBmV 46.2 dB 0 0
4 Locked 256 QAM 3 429000000 Hz -1.1 dBmV 46.1 dB 0 0
5 Locked 256 QAM 5 441000000 Hz -1.3 dBmV 46 dB 0 0
6 Locked 256 QAM 6 447000000 Hz -1.3 dBmV 45.9 dB 0 0
7 Locked 256 QAM 7 453000000 Hz -1.3 dBmV 45.8 dB 0 0
8 Locked 256 QAM 8 459000000 Hz -1.6 dBmV 45.7 dB 0 0
9 Locked 256 QAM 9 465000000 Hz -1.5 dBmV 45.8 dB 0 0
10 Locked 256 QAM 10 471000000 Hz -1.6 dBmV 45.7 dB 0 0
11 Locked 256 QAM 11 477000000 Hz -1.7 dBmV 45.6 dB 0 0
12 Locked 256 QAM 12 483000000 Hz -1.8 dBmV 45.5 dB 0 0
13 Locked 256 QAM 13 489000000 Hz -1.7 dBmV 45.5 dB 0 0
14 Locked 256 QAM 14 495000000 Hz -1.7 dBmV 45.6 dB 0 0
15 Locked 256 QAM 15 501000000 Hz -1.7 dBmV 45.5 dB 0 0
16 Locked 256 QAM 16 507000000 Hz -1.7 dBmV 45.5 dB 0 0
17 Locked 256 QAM 17 519000000 Hz -1.6 dBmV 45.5 dB 0 0
18 Locked 256 QAM 18 525000000 Hz -1.7 dBmV 45.5 dB 0 0
19 Locked 256 QAM 19 531000000 Hz -1.9 dBmV 45.4 dB 0 0
20 Locked 256 QAM 20 537000000 Hz -1.9 dBmV 45.2 dB 0 0
21 Locked 256 QAM 21 543000000 Hz -2.2 dBmV 45.1 dB 0 0
22 Locked 256 QAM 22 549000000 Hz -2.3 dBmV 45 dB 0 0
23 Locked 256 QAM 23 555000000 Hz -2.4 dBmV 44.9 dB 0 0
24 Locked 256 QAM 24 561000000 Hz -2.4 dBmV 44.9 dB 0 0
25 Locked 256 QAM 25 567000000 Hz -2.4 dBmV 44.9 dB 0 0
26 Locked 256 QAM 26 573000000 Hz -2.3 dBmV 44.9 dB 0 0
27 Locked 256 QAM 27 579000000 Hz -2.4 dBmV 44.8 dB 0 0
28 Locked 256 QAM 28 585000000 Hz -2.3 dBmV 44.8 dB 0 0
29 Locked 256 QAM 29 591000000 Hz -2.3 dBmV 44.8 dB 0 0
30 Locked 256 QAM 30 597000000 Hz -2.3 dBmV 44.7 dB 0 0
31 Locked 256 QAM 31 603000000 Hz -2 dBmV 44.8 dB 0 0
32 Locked 256 QAM 32 609000000 Hz -2.2 dBmV 44.8 dB 0 0
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 34.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 34.3 dBmV
3 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 34.5 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 34.5 dBmV
5 Not Locked Unknown 0 0 0 0.0
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 ,3 193 957000000 Hz -4.42 dBmV 41.4 dB 148 ~ 3947 10963806 1924625 0
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
Event Log
Time Priority Description
Mon Jan 8 12:23:51 2024 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 8 12:23:51 2024 Notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 8 12:23:27 2024 Notice TLV-11 - unrecognized OID;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:51 1970 Notice Honoring MDD; IP provisioning mode = IPv6
Thu Jan 1 00:00:46 1970 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:43 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 8 12:20:31 2024 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:46 1970 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:43 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 8 12:18:21 2024 Critical Resetting the cable modem due to docsDevResetNow
Mon Jan 8 11:57:31 2024 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 8 11:57:29 2024 Critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:03:05 1970 Critical No Ranging Response received - T3 time-out;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:03:02 1970 Critical UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:02:43 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:57 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Here is the Event Log
| Mon Jan 8 12:23:51 2024 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Mon Jan 8 12:23:51 2024 | Notice (6) | DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Mon Jan 8 12:23:27 2024 | Notice (6) | TLV-11 - unrecognized OID;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:00:51 1970 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
| Thu Jan 1 00:00:46 1970 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:00:43 1970 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
| Mon Jan 8 12:20:31 2024 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:00:46 1970 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:00:43 1970 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
| Mon Jan 8 12:18:21 2024 | Critical (3) | Resetting the cable modem due to docsDevResetNow |
| Mon Jan 8 11:57:31 2024 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Mon Jan 8 11:57:29 2024 | Critical (3) | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:03:05 1970 | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:03:02 1970 | Critical (3) | UCD invalid or channel unusable;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:90:f0:27:01:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:02:43 1970 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
| Thu Jan 1 00:00:57 1970 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:d4:03;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; |
What FW version is loaded on the modem?
What ethernet PC are you using? Brand and model of ethernet adapter.
And you've connected directly to the back of the modem with out the switch in the mix?
What speeds are seen when you have smart connect enabled?
Cable specs look ok.
However there's some criticals in the event logs that the ISP needs to take a look at. Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
Firmware: V2.1.5.2
Using a MacBook Pro M1 Pro with Ethernet.
Yes I tried plugging it in the back of the modem and get the same results. I will note its the same results when using Wifi as well. Yesterday, before I switch out the Xfinity Modem, I was getting 1000Mbps down and 200Mbps Up on Ethernet and 700Mbps Down and 180Mbps Up on Wifi.
I don't have smart connect enabled because I need to have two separate SSID's one for 2.4Ghz and one for 5Ghz as some of my devices that require 2.4, don't work with a shared SSID.