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user_63ecf4
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Wednesday, August 30th, 2023 12:41 AM

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Intermittent Slow upload speeds with NetGear CAX30

Hey All, been having this problem ever since I moved to my new house around 3 months ago. It originally started with my Arris SBG10, everything would be fine until randomly my upload speeds would completely tank to less than .1 mbps while my download speeds stayed consistent. I switched to a Netgear CAX30 to try to remedy the problem with no luck, I see the exact same problem (intermittently, around 5-10 times per day) with the brand new modem. I've already had one xfinity technician come out here and say everything is fine. I've also confirmed that there are no splitters, filters, or amplifiers stemming from the line directly plugged into my house from the pole. There is one extender(idk what its called just a single female to female coax connector) going through a box on the outside of my house. Any help would be greatly appreciated! 

Here are my modem's event logs(with my MAC removed). 

Time Priority Description
2023-08-29 17:07:32 Warning (5) DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;
2023-08-29 17:07:30 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;
2023-08-29 16:55:25 Warning (5) Dynamic Range Window violation
2023-08-29 16:55:25 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;
2023-08-29 16:55:25 Warning (5) Dynamic Range Window violation
2023-08-29 16:55:25 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;
2023-08-29 16:55:25 Warning (5) Dynamic Range Window violation
2023-08-29 16:55:25 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;
2023-08-29 16:55:25 Warning (5) REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;
2023-08-29 16:55:20 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1.;
2023-08-29 16:55:08 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2023-08-29 16:51:26 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:51:21 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 16:51:01 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2023-08-29 16:51:01 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 16:50:41 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:50:41 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 16:50:22 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:50:22 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 16:50:02 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:50:01 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 16:49:00 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:48:57 Warning (5) MDD message timeout;
2023-08-29 16:48:55 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2023-08-29 16:22:20 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-29 15:29:25 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2023-08-29 11:47:07 Notice (6) CM-STATUS message sent. Event Type Code: 22; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-29 11:46:41 Notice (6) CM-STATUS message sent. Event Type Code: 20; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-29 11:18:47 Notice (6) CM-STATUS message sent. Event Type Code: 22; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-29 11:18:18 Notice (6) CM-STATUS message sent. Event Type Code: 20; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-29 11:14:50 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-28 20:59:08 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2023-08-28 19:44:00 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2023-08-28 15:19:59 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2023-08-28 14:06:49 Notice (6) CM-STATUS message sent. Event Type Code: 3; Chan ID: N/A; DSID: W; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-28 14:03:48 Notice (6) CM-STATUS message sent. Event Type Code: 21; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2023-08-28 14:03:42 Warning (5) REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;
2023-08-28 14:03:37 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 
2023-08-28 14:03:27 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2023-08-28 14:03:07 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1.;

And my cable connection page,

Starting Frequency
 
<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment
Acquire Downstream Channel 483000000 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 13 483000000 Hz 8.7 dBmV 42.2 dB 124434 258985
2 Locked 256 QAM 14 489000000 Hz 8.6 dBmV 42.2 dB 1381715 399285
3 Locked 256 QAM 15 495000000 Hz 8.6 dBmV 42.3 dB 112338 240301
4 Locked 256 QAM 16 501000000 Hz 8.4 dBmV 42.4 dB 101912 163150
5 Locked 256 QAM 17 507000000 Hz 8.5 dBmV 42.3 dB 97927 200359
6 Locked 256 QAM 18 513000000 Hz 8.3 dBmV 42.3 dB 105090 186786
7 Locked 256 QAM 19 519000000 Hz 8.3 dBmV 42.4 dB 100965 166481
8 Locked 256 QAM 20 525000000 Hz 7.1 dBmV 41.9 dB 134730 291310
9 Locked 256 QAM 21 531000000 Hz 7.0 dBmV 41.9 dB 147541 341613
10 Locked 256 QAM 22 537000000 Hz 7.3 dBmV 42.0 dB 135687 306634
11 Locked 256 QAM 23 543000000 Hz 7.2 dBmV 42.0 dB 134029 314220
12 Locked 256 QAM 24 549000000 Hz 7.4 dBmV 42.1 dB 133937 288969
13 Locked 256 QAM 25 555000000 Hz 7.5 dBmV 42.0 dB 101385 215793
14 Locked 256 QAM 26 561000000 Hz 7.3 dBmV 41.8 dB 130497 315466
15 Locked 256 QAM 27 567000000 Hz 6.9 dBmV 41.6 dB 118396 247489
16 Locked 256 QAM 28 573000000 Hz 7.3 dBmV 41.6 dB 116088 246808
17 Locked 256 QAM 29 579000000 Hz 6.4 dBmV 41.3 dB 115817 282535
18 Locked 256 QAM 30 585000000 Hz 7.0 dBmV 41.5 dB 113144 222884
19 Locked 256 QAM 31 591000000 Hz 7.6 dBmV 41.8 dB 112493 247783
20 Locked 256 QAM 32 597000000 Hz 7.4 dBmV 41.5 dB 100365 190240
21 Locked 256 QAM 33 603000000 Hz 7.5 dBmV 41.5 dB 100794 144026
22 Locked 256 QAM 34 609000000 Hz 7.5 dBmV 41.4 dB 95794 126362
23 Locked 256 QAM 35 615000000 Hz 7.8 dBmV 41.0 dB 96754 132650
24 Locked 256 QAM 36 621000000 Hz 8.1 dBmV 41.6 dB 95952 151489
25 Locked 256 QAM 37 627000000 Hz 7.8 dBmV 41.4 dB 111255 201515
26 Locked 256 QAM 38 633000000 Hz 7.4 dBmV 41.2 dB 110443 193805
27 Locked 256 QAM 39 639000000 Hz 7.3 dBmV 41.0 dB 113063 198731
28 Locked 256 QAM 40 645000000 Hz 7.3 dBmV 41.1 dB 117439 223732
29 Locked 256 QAM 41 651000000 Hz 7.3 dBmV 41.1 dB 116919 210636
30 Locked 256 QAM 42 657000000 Hz 7.1 dBmV 41.1 dB 117268 240678
31 Locked 256 QAM 43 663000000 Hz 6.2 dBmV 40.7 dB 108548 210906
32 Locked 256 QAM 44 669000000 Hz 6.3 dBmV 40.7 dB 26960575 15543775
 
<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 46.8 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 48.3 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 48.3 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 48.3 dBmV
5 Locked ATDMA 5 5120 Ksym/sec 39600000 Hz 49.0 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
1 159 Non-Primary 617.6 MHz 1126 ~ 2969 3382660652 4
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

Question

 • 

Updated 

2 years ago

348

2

user_63ecf4

3 Messages

2 years ago

For additional context, every red line here is a point in which my upload speeds completely tank and I drop my work video calls/remote desktop sessions. This is ridiculous, I can't WFH at all. 

1

0

XfinityEsteban

Official Employee

 • 

137 Messages

Hello, @user_63ecf4. I know how important it is to have a stable connection to work from home. Please allow me to help you get this fixed as soon as possible. 

Could you send me a direct message with the full name and complete address for your service? 

To send a direct message [private message]:

   Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging

   Click the "New message" (pencil and paper) icon

   The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.

   - As you are typing a drop-down list appears. Select "Xfinity Support" from that list.

   - An "Xfinity Support" graphic replaces the "To:" line.

   Type your message in the text area near the bottom of the window

   Press Enter to send it

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

2 years ago

0

user_63ecf4

3 Messages

2 years ago

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 1280 Ksym/sec 35600000 Hz 51.0 dBmV
2 Locked ATDMA 2 1280 Ksym/sec 29200000 Hz 54.5 dBmV
3 Locked ATDMA 3 1280 Ksym/sec 22800000 Hz 56.0 dBmV
4 Locked ATDMA 4 1280 Ksym/sec 16400000 Hz 56.0 dBmV
5 Locked ATDMA 5 1280 Ksym/sec 39600000 Hz 50.0 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

Updated upstream bonded channels after I had the advanced tech come out and replace the entire coax line coming into my house. Upstream channels are still ridiculously high causing my upload speeds to drop tremendously. 

(edited)

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