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Forum Discussion
CAX30s Xfinity 1G speed issues
I recently within the past month purchased a CAX30. At the time I was running Xfinitys 800 speed. Through ethernet I was getting 920ish mbps and everything was good. I recently upgraded to 1G speeds and havent been able to get anything over 840 since. I'm not sure why all the sudden im getting lower speeds than I was when i was on 800mbps plan but I was wondering if someone could help me with this or if anyone else has ran into the same issues.
6 Replies
Is that wired or wireless speed results. Wired is preferred.
What FW is loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-routerThis is on a cat 8 ethernet wired. Firmware version 1.4.12.2. I had upgraded firmware to the latest when i first got the CAX30 but the speeds were terrible so I came back down to 1.4.12.2 and hadn't had any issues until today
Time Priority Description 2023-12-07 18:14:56 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out; 2023-12-07 17:43:57 Error (4) SW upgrade Failed before download -TFTP Max Retry Exceeded 2023-12-07 17:43:27 Notice (6) SW Download INIT - Via Config file d11_m_cax30_extremepro_c01.cm 2023-12-07 17:43:16 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1970-01-01 00:00:41 Notice (6) Honoring MDD; IP provisioning mode = IPv6 1970-01-01 00:00:35 Critical (3) No Ranging Response received - T3 time-out;CM- 1970-01-01 00:00:29 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing; 2023-12-07 17:41:28 Critical (3) Resetting the cable modem due to docsDevResetNow 1970-01-01 00:00:30 Critical (3) No Ranging Response received - T3 time-out 1970-01-01 00:00:24 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing; 1970-01-01 00:00:29 Critical (3) No Ranging Response received - T3 time-out;CM- 1970-01-01 00:00:24 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing; 2023-12-07 16:23:15 Critical (3) Resetting the cable modem due to docsDevResetNow Frequency start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. Starting Frequency <tabindex=-1>Startup Procedure</tabindex=-1> Procedure Status Comment Acquire Downstream Channel 705000000 Hz Locked Connectivity State OK Registration Complete Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD IPv6 only <tabindex=-1>Downstream Bonded Channels</tabindex=-1> Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectabables 1 Locked 256 QAM 37 705000000 Hz -4.-8 dBmV 38.0 dB 183616 172984 2 Locked 256 QAM 10 531000000 Hz -3.-3 dBmV 41.4 dB 0 0 3 Locked 256 QAM 11 537000000 Hz -3.-4 dBmV 41.5 dB 0 0 4 Locked 256 QAM 12 543000000 Hz -2.-5 dBmV 42.0 dB 0 0 5 Locked 256 QAM 13 549000000 Hz -2.-8 dBmV 42.0 dB 0 0 6 Locked 256 QAM 14 555000000 Hz -3.-1 dBmV 42.1 dB 0 0 7 Locked 256 QAM 15 561000000 Hz -2.-2 dBmV 42.5 dB 0 0 8 Locked 256 QAM 16 579000000 Hz -2.-4 dBmV 42.7 dB 0 0 9 Locked 256 QAM 17 585000000 Hz -2.-3 dBmV 42.7 dB 0 0 10 Locked 256 QAM 18 591000000 Hz -3.-6 dBmV 42.1 dB 0 0 11 Locked 256 QAM 19 597000000 Hz -3.-8 dBmV 42.1 dB 0 0 12 Locked 256 QAM 20 603000000 Hz -3.-9 dBmV 41.8 dB 0 0 13 Locked 256 QAM 21 609000000 Hz -4.-8 dBmV 41.4 dB 0 0 14 Locked 256 QAM 22 615000000 Hz -4.-7 dBmV 41.2 dB 0 0 15 Locked 256 QAM 23 621000000 Hz -3.-6 dBmV 41.3 dB 0 0 16 Locked 256 QAM 24 627000000 Hz -4.0 dBmV 40.8 dB 0 0 17 Locked 256 QAM 25 633000000 Hz -4.-4 dBmV 40.5 dB 0 0 18 Locked 256 QAM 26 639000000 Hz -3.-8 dBmV 40.3 dB 0 0 19 Locked 256 QAM 27 645000000 Hz -3.-7 dBmV 39.9 dB 0 0 20 Locked 256 QAM 28 651000000 Hz -3.-7 dBmV 39.9 dB 0 0 21 Locked 256 QAM 29 657000000 Hz -3.0 dBmV 39.9 dB 0 0 22 Locked 256 QAM 30 663000000 Hz -3.0 dBmV 39.8 dB 0 0 23 Locked 256 QAM 31 669000000 Hz -3.-6 dBmV 39.6 dB 0 0 24 Locked 256 QAM 32 675000000 Hz -3.-5 dBmV 39.4 dB 0 0 25 Locked 256 QAM 33 681000000 Hz -3.-8 dBmV 39.6 dB 0 0 26 Locked 256 QAM 34 687000000 Hz -4.-9 dBmV 39.3 dB 0 0 27 Locked 256 QAM 35 693000000 Hz -5.-1 dBmV 39.2 dB 0 0 28 Locked 256 QAM 36 699000000 Hz -4.-6 dBmV 39.1 dB 0 0 29 Locked 256 QAM 38 711000000 Hz -4.-9 dBmV 38.9 dB 46474 49181 30 Locked 256 QAM 39 717000000 Hz -4.-6 dBmV 39.0 dB 0 0 31 Locked 256 QAM 40 723000000 Hz -4.-7 dBmV 39.0 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 <tabindex=-1>Upstream Bonded Channels</tabindex=-1> Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 55.3 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 54.5 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 53.0 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 51.8 dBmV 5 Locked ATDMA 5 5120 Ksym/sec 39600000 Hz 52.8 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV <tabindex=-1>Downstream OFDM Channels</tabindex=-1> Channel Channel ID Indicator Subcarrier Zero Frequency Active Subcarrier Number Range Total Codewords Uncorrectable Codewords 1 41 Non-Primary 671.6 MHz 1108 ~ 2987 10975123 0 2 0 Other 0 MHz 0 ~ 0 0 0 <tabindex=-1>Upstream OFDMA Channels</tabindex=-1> Channel UpstreamIsMuted Ranging Status Subcarrier Zero Frequency Active Subcarrier Number Range Symbols Per Frame Tx Power 1 Other 0 MHz 0 ~ 0 0 0 dBmV 2 Other 0 MHz 0 ~ 0 0 0 dBmV 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.
Power is on the low side but with specs:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
There's lots of uncorrecables and correctables on one channel that should be zeros like the other channels.
I'd re-update FW back to suggested. Then have the ISP take a look at what has been put forth here.
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/
