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Modem Keeps Rebooting around Midnight, Causing Issues with Work

chrisg23
Frequent Visitor

Modem Keeps Rebooting around Midnight, Causing Issues with Work

Hello, I'm having issues where every 2-3 nights or so my modem will receive a re-provision signal and reboot right around midnight. A few times it has occurred in the middle of the day as well.

Can someone please help stop this constant interruption of my service? I am working from home now due to Covid and my work VPN keeps getting interrupted at very inconvenient times causing me quite a bit of issues and loss of work. I have Xfinity Gigabit internet. 

 

I've chatted with Comcast assistance and they checked my signals and said everything looked good. This only happens around midnight eastern every few nights roughly, the rest of the time during the day it's fine and my speeds are excellent (~950Mbps down). Any and all help would be greatly appreciated!

 

Below is a log of  the most recent occurances that show how often the reboots are happening, these were pulled from my Arris T25 (customer owned, not a rental):

 

DOCSIS Events

Date Time Event ID Event Level Description
5/26/2020 3:37 84020200 5 Lost MDD Timeout;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/26/2020 10:35 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 9:53 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 23:17 84020200 5 Lost MDD Timeout;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 23:20 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/29/2020 13:58 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/30/2020 17:40 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/1/2020 23:56 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:1b:13:b3;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/1/2020 23:58 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

 

Packet Cable Events

5/26/2020 10:36 16 MTA TFTP: Successful
5/26/2020 10:36 4000951500 Provisioning Complete
5/26/2020 10:36 26 MTA PROV: Successful!
5/26/2020 10:36 3 Voice Line State Change, Line Number = 1, Prev State = OOS, New State = IS
5/26/2020 10:36 3 Voice Line State Change, Line Number = 2, Prev State = OOS, New State = IS
5/28/2020 23:20 16 MTA TFTP: Successful
5/28/2020 23:20 4000951500 Provisioning Complete
5/28/2020 23:20 26 MTA PROV: Successful!
5/28/2020 23:20 3 Voice Line State Change, Line Number = 1, Prev State = OOS, New State = IS
5/28/2020 23:20 3 Voice Line State Change, Line Number = 2, Prev State = OOS, New State = IS
5/29/2020 13:56 3000000002 MTA RESET:
5/29/2020 13:59 16 MTA TFTP: Successful
5/29/2020 13:59 4000951500 Provisioning Complete
5/29/2020 13:59 26 MTA PROV: Successful!
5/29/2020 13:59 3 Voice Line State Change, Line Number = 1, Prev State = OOS, New State = IS
5/29/2020 13:59 3 Voice Line State Change, Line Number = 2, Prev State = OOS, New State = IS
6/1/2020 23:59 16 MTA TFTP: Successful
6/1/2020 23:59 4000951500 Provisioning Complete
6/1/2020 23:59 26 MTA PROV: Successful!
6/1/2020 23:59 3 Voice Line State Change, Line Number = 1, Prev State = OOS, New State = IS
6/1/2020 23:59 3 Voice Line State Change, Line Number = 2, Prev State = OOS, New State = IS
EG
Expert

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Please post the modem's signal status figures as well.


Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.




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chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Thank you! Here are those power levels:

 

  DCID Freq Power SNR Modulation Octets Correcteds Uncorrectables
Downstream 1 1 453.00 MHz -0.20 dBmV 40.37 dB 256QAM 1140302832 0 0
Downstream 2 2 459.00 MHz 0.00 dBmV 40.37 dB 256QAM 58239341 0 0
Downstream 3 3 465.00 MHz -0.20 dBmV 40.95 dB 256QAM 63919649 0 0
Downstream 4 4 471.00 MHz 0.10 dBmV 40.37 dB 256QAM 58984414 0 0
Downstream 5 5 477.00 MHz 0.00 dBmV 40.37 dB 256QAM 60001194 0 0
Downstream 6 6 483.00 MHz 0.30 dBmV 40.37 dB 256QAM 61246304 557 4089
Downstream 7 7 489.00 MHz -0.50 dBmV 40.37 dB 256QAM 62130460 135 95
Downstream 8 8 495.00 MHz 0.30 dBmV 40.37 dB 256QAM 65551272 86 0
Downstream 9 9 519.00 MHz 0.00 dBmV 38.98 dB 256QAM 66734201 3 0
Downstream 10 10 525.00 MHz -0.50 dBmV 40.37 dB 256QAM 64778238 0 0
Downstream 11 11 531.00 MHz -0.40 dBmV 40.37 dB 256QAM 63421311 0 0
Downstream 12 12 537.00 MHz -0.40 dBmV 40.37 dB 256QAM 64384086 0 0
Downstream 13 13 543.00 MHz -0.20 dBmV 38.98 dB 256QAM 1125125255 0 0
Downstream 14 14 549.00 MHz -0.10 dBmV 40.37 dB 256QAM 63341036 0 0
Downstream 15 15 555.00 MHz 0.30 dBmV 40.37 dB 256QAM 66440761 1 0
Downstream 16 16 561.00 MHz 0.40 dBmV 38.61 dB 256QAM 63005458 2 0
Downstream 17 17 567.00 MHz 1.00 dBmV 40.37 dB 256QAM 1118179385 0 0
Downstream 18 18 573.00 MHz 0.60 dBmV 38.98 dB 256QAM 56251426 0 0
Downstream 19 19 579.00 MHz 1.30 dBmV 38.98 dB 256QAM 68180289 0 0
Downstream 20 20 585.00 MHz 1.00 dBmV 40.37 dB 256QAM 65202333 0 0
Downstream 21 21 591.00 MHz 1.10 dBmV 38.98 dB 256QAM 69076709 0 0
Downstream 22 22 597.00 MHz 0.90 dBmV 38.98 dB 256QAM 87698453 0 0
Downstream 23 23 603.00 MHz 0.60 dBmV 38.98 dB 256QAM 79713259 0 0
Downstream 24 26 615.00 MHz 0.50 dBmV 38.98 dB 256QAM 1128271828 344 1413
Downstream 25 27 621.00 MHz 1.10 dBmV 38.98 dB 256QAM 71880673 128 0
Downstream 26 28 627.00 MHz 0.80 dBmV 40.37 dB 256QAM 73265542 110 0
Downstream 27 29 633.00 MHz 1.40 dBmV 40.37 dB 256QAM 76747548 54 0
Downstream 28 30 639.00 MHz 1.10 dBmV 38.61 dB 256QAM 69166873 84 75
Downstream 29 31 645.00 MHz 0.90 dBmV 38.98 dB 256QAM 58306379 37 0
Downstream 30 32 651.00 MHz 0.80 dBmV 38.61 dB 256QAM 73000715 59 0
Downstream 31 33 657.00 MHz 0.70 dBmV 40.37 dB 256QAM 64807584 13 0

 

  UCID Freq Power Channel Type Symbol Rate Modulation
Upstream 1 2 23.70 MHz 33.75 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 2 4 36.50 MHz 35.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 3 3 30.10 MHz 34.25 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 4 1 17.30 MHz 32.75 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
EG
Expert

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

The signal stats are o/k but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

 

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

 



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chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Thank you so much! I greatly appreciate it!

ComcastAmir
Official Employee

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Hi chrisg23, EG is right it looks like there may be an issue with some signal noise in your line. I'd be happy to look into it for you, to continue could you please send me a private message with your full name by clicking on my name (ComcastAmir) and then click "Send a message"?


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Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Hi Amir, have you had a chance to look into this yet? I hope I correctly sent all of the requested information to you in a private message. 

chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Cany anyone at Comcast look into this please? I've contacted Comcast in every single way available and no one ever follows back up with me. 

EG
Expert

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I'm going to try re-escalating this issue.



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I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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ComcastAmira
Official Employee

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Hello @chrisg23, thanks for reaching back out to us. I offer my deepest apologies for your experience with us thus far, in regard to this connection issue you have been experiencing. We definitely want to get to the bottom of this issue so that we can get it corrected. I would love to assist you and promise to stick with you until we reach a resolution. Can you please send me a private message including your first and last name as it appears on the account? 

 

To send me a Private Message, please click my name “ComcastAmira” and click “send a message". 


I am an Official Comcast Employee.
Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Thank you, private message has been sent.

clasherhic
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work


@chrisg23 wrote:

Thank you, private message has been sent.


Please keep this issue public as it has been happening to me as well. It just happened a little while ago.

 

I also have a T25 and in Northern Virginia.

 

Date Time Event ID Event Level Description
5/28/2020 0:14 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 0:14 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 0:18 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 0:18 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 0:18 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/28/2020 18:32 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
5/29/2020 10:40 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/1/2020 1:12 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/1/2020 9:25 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/3/2020 6:15 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/4/2020 19:42 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/4/2020 21:11 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/4/2020 23:26 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/4/2020 23:26 82000500 3 Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/5/2020 2:04 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/5/2020 18:09 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/6/2020 1:17 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/7/2020 2:05 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/7/2020 21:38 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/7/2020 22:14 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/7/2020 23:30 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/9/2020 0:48 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/9/2020 23:46 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/10/2020 4:36 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/10/2020 23:11 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/11/2020 0:24 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/14/2020 23:19 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/15/2020 13:58 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/18/2020 15:18 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/18/2020 16:48 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/22/2020 12:32 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/22/2020 16:26 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 19:01 82001100 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/23/2020 23:50 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/24/2020 19:05 82001200 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 9:56 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 11:14 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 11:14 84020200 5 Lost MDD Timeout;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 11:17 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 11:20 84020100 4 Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
6/25/2020 11:21 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=14:c0:3e:14:cd:b4;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

 

 PacketCable(MTA) Events

 

Date Time Event ID Description
5/8/2020 9:08 25 MTA PROV: Failed
5/8/2020 9:20 3000000002 MTA RESET:
5/8/2020 9:22 25 MTA PROV: Failed
5/9/2020 9:05 3000000004 DOCSIS-CONN-ERROR
5/9/2020 9:05 3000000002 MTA RESET:
5/9/2020 9:11 25 MTA PROV: Failed
5/9/2020 9:26 3000000004 DOCSIS-CONN-ERROR
5/9/2020 9:26 3000000002 MTA RESET:
5/9/2020 9:26 25 MTA PROV: Failed
5/9/2020 9:35 3000000004 DOCSIS-CONN-ERROR
5/9/2020 9:35 3000000002 MTA RESET:
5/9/2020 9:36 25 MTA PROV: Failed
5/9/2020 9:50 3000000002 MTA RESET:
5/9/2020 9:52 25 MTA PROV: Failed
5/9/2020 12:32 3000000004 DOCSIS-CONN-ERROR
5/9/2020 12:32 3000000002 MTA RESET:
5/9/2020 12:33 25 MTA PROV: Failed
5/9/2020 12:45 3000000004 DOCSIS-CONN-ERROR
5/9/2020 12:45 3000000002 MTA RESET:
5/9/2020 13:06 25 MTA PROV: Failed
5/9/2020 14:26 3000000004 DOCSIS-CONN-ERROR
5/9/2020 14:26 3000000002 MTA RESET:
5/9/2020 14:53 25 MTA PROV: Failed
5/9/2020 15:08 3000000004 DOCSIS-CONN-ERROR
5/9/2020 15:08 3000000002 MTA RESET:
5/9/2020 15:26 25 MTA PROV: Failed
5/9/2020 16:21 3000000002 MTA RESET:
5/9/2020 16:23 25 MTA PROV: Failed
5/12/2020 3:40 25 MTA PROV: Failed
5/18/2020 23:13 25 MTA PROV: Failed
5/20/2020 17:45 4000960006 New time has been retrieved from ToD server.
5/24/2020 23:12 25 MTA PROV: Failed
5/27/2020 23:47 3000000002 MTA RESET:
5/27/2020 23:49 25 MTA PROV: Failed
5/28/2020 0:18 3000000004 DOCSIS-CONN-ERROR
5/28/2020 0:18 3000000002 MTA RESET:
5/28/2020 0:18 25 MTA PROV: Failed
6/1/2020 1:12 25 MTA PROV: Failed
6/3/2020 6:13 3000000002 MTA RESET:
6/3/2020 6:16 25 MTA PROV: Failed
6/4/2020 23:26 25 MTA PROV: Failed
6/9/2020 23:44 3000000002 MTA RESET:
6/9/2020 23:46 25 MTA PROV: Failed
6/14/2020 23:19 25 MTA PROV: Failed
6/18/2020 15:18 25 MTA PROV: Failed
6/22/2020 12:32 25 MTA PROV: Failed
6/23/2020 23:50 25 MTA PROV: Failed
6/25/2020 11:18 3000000004 DOCSIS-CONN-ERROR
6/25/2020 11:18 3000000002 MTA RESET:
6/25/2020 11:21 25

MTA PROV: Failed

 

 

 

 

 RF Parameters

Downstream QAM

  DCID Freq Power SNR Modulation Octets Correcteds Uncorrectables
Downstream 1 13 577.75 MHz 4.80 dBmV 40.37 dB 256QAM 52716164 1 0
Downstream 2 10 559.75 MHz 5.50 dBmV 40.37 dB 256QAM 9658872 7 0
Downstream 3 11 565.75 MHz 4.90 dBmV 40.37 dB 256QAM 9552945 2019 0
Downstream 4 12 571.75 MHz 5.20 dBmV 40.95 dB 256QAM 10270947 1 0
Downstream 5 14 583.75 MHz 4.40 dBmV 40.37 dB 256QAM 9076411 10 1
Downstream 6 15 589.75 MHz 5.10 dBmV 40.37 dB 256QAM 8719963 17 0
Downstream 7 16 595.75 MHz 4.30 dBmV 40.37 dB 256QAM 8723831 0 0
Downstream 8 17 601.75 MHz 3.80 dBmV 40.37 dB 256QAM 2418021 16389 0
Downstream 9 18 607.75 MHz 4.00 dBmV 40.95 dB 256QAM 3516539 8 0
Downstream 10 19 613.75 MHz 3.90 dBmV 38.98 dB 256QAM 3499159 8 0
Downstream 11 20 619.75 MHz 3.20 dBmV 38.98 dB 256QAM 3374181 12 0
Downstream 12 21 625.75 MHz 4.30 dBmV 38.98 dB 256QAM 3100349 7 0
Downstream 13 22 631.75 MHz 2.40 dBmV 40.37 dB 256QAM 3909728 0 0
Downstream 14 23 637.75 MHz 3.00 dBmV 40.37 dB 256QAM 4123743 0 0
Downstream 15 24 643.75 MHz 3.00 dBmV 38.98 dB 256QAM 3933673 0 0
Downstream 16 26 649.75 MHz 2.40 dBmV 38.98 dB 256QAM 25896548 0 0
Downstream 17 27 655.75 MHz 2.10 dBmV 38.98 dB 256QAM 4555148 0 0
Downstream 18 28 661.75 MHz 1.10 dBmV 38.61 dB 256QAM 3965651 0 0
Downstream 19 29 667.75 MHz -1.70 dBmV 37.64 dB 256QAM 4416785 0 0
Downstream 20 30 673.75 MHz -9.10 dBmV 31.34 dB 256QAM 2942487 388459 172601
Downstream 21 31 679.75 MHz -6.60 dBmV 33.06 dB 256QAM 4703289 30467 4115
Downstream 22 32 685.75 MHz -2.20 dBmV 37.36 dB 256QAM 4593803 0 0
Downstream 23 33 691.75 MHz 1.40 dBmV 38.61 dB 256QAM 6090616 7 0
Downstream 24 34 697.75 MHz 1.50 dBmV 38.98 dB 256QAM 29237664 0 0
Downstream 25 35 703.75 MHz 1.70 dBmV 38.98 dB 256QAM 7625069 2 0
Downstream 26 36 709.75 MHz 2.20 dBmV 38.98 dB 256QAM 7354834 4 0
Downstream 27 37 715.75 MHz 2.00 dBmV 38.61 dB 256QAM 7610418 10 0
Downstream 28 38 721.75 MHz 1.70 dBmV 40.37 dB 256QAM 5785535 11 0
Downstream 29 39 727.75 MHz 2.30 dBmV 38.98 dB 256QAM 7792372 1 0
Downstream 30 40 733.75 MHz 1.50 dBmV 38.98 dB 256QAM 8245256 2 1
Downstream 31 41 739.75 MHz 1.70 dBmV 38.98 dB 256QAM 8367163 0 0
Reset FEC Counters

Downstream OFDM

  FFT Type Channel Width(MHz) # of Active Subcarriers First Active Subcarrier(MHz) Last Active Subcarrier(MHz) Average RxMER(dB)
Pilot PLC Data
Downstream 2 4K 94 1880 769 862 44 40 38
 

Upstream QAM

  UCID Freq Power Channel Type Symbol Rate Modulation
Upstream 1 8 17.30 MHz 34.75 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 2 7 23.70 MHz 36.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 3 6 30.10 MHz 36.25 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 4 5 36.50 MHz 37.25 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM

Upstream OFDM

  FFT Type Channel Width(MHz) # of Active Subcarriers First Active Subcarrier(MHz) Last Active Subcarrier(MHz) Tx Power(dBmV)

 

 Status
System Uptime: 1 d: 11 h: 45 m
Computers Detected: staticCPE(1), dynamicCPE(1)
CM Status: Telephony-DHCP
Time and Date: Thu 2020-06-25 11:34:06

 

 Interface Parameters
Interface Name Provisioned State Speed (Mbps) MAC address
LAN Port 1 Enabled Up 1000 (Full) 14:C0:3E:14:CD:B3
LAN Port 2 Enabled Down ----- 14:C0:3E:14:CD:B3
CABLE Enabled Up ----- 14:C0:3E:14:CD:B4
MTA FailOtherReason Down ----- 14:C0:3E:14:CD:B5

 

 Diplexer
  Upstream Range Downstream Range Current Band Setting
Band 0 5 MHz-85 MHz 108 MHz-1002 MHz  
Band 1 5 MHz-42 MHz 108 MHz-1002 MHz X
chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I am also located in VA (near Northern VA). Hopefully I can get it resolved, if we come to a resolution I will be sure to post what the cause was. 

 

This has been happening approximately 2 months or so, so a relatively new problem. 

clasherhic
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I want to say it's been longer than 2 months for me, but yes, definitely since at least March. 

I am in Sterling VA. They came out and did line tests and found it was not optimum.

They ran orange coax cable across a couple of streets that still have not been buried.

chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

They've remotely determined that my signal levels look OK so they want to send someone to check the outside connectivity at my home. 

Hopefully they can get to the bottom of this. Luckily the Xfinity box for the neighborhood is in my yard so if they do need to run a cable it won't be that far I would hope. 

 

But yes I would say it's likely been since March for me as well. It's much more noticeable now that I'm teleworking during covid so it could have even been happening for longer I just didn't notice it yet or just attributed it to random network issues. 

clasherhic
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Some more to add. Just happened again.. This is rediculous. I will be switching back to Verizon FIOS soon. I don't care that I wasted the investment on the Arris T25 modem. 

 

6/25/2020 11:18 3000000004 DOCSIS-CONN-ERROR
6/25/2020 11:18 3000000002 MTA RESET:
6/25/2020 11:21 25 MTA PROV: Failed
6/30/2020 4:32 25 MTA PROV: Failed
7/3/2020 15:44 25 MTA PROV: Failed
7/7/2020 23:21 25 MTA PROV: Failed
clasherhic
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I was paying $74.99 a month for 1Gbps connection from comcast. 

I realistically got about 600Mbps down and 50Mbps upload on good days. Connection going out randomly while working is unacceptable. I canceled my service.

 

Signed up with vz fios and paying $79.99 for 1Gbps up and down. I am getting 860Mbps down and 760 upload with the whole family awake and using devices. 

SugaCookie
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I've been in the same boat as all of you since March and since I upgraded my Camble modem to the Arris T25.  I've contacted Comcast many times, each reply they reported they do not see any issues with my connection. They even asked me to contact Arris directly which I did. Just to add more info to the thread Arris Tech support indicated my upstream power was not within the spec of the T25 and asked me to inform Comcast to adjust the cable signal levels. When I called to report they told me these could not be adjusted and was controlled automatically by the software. I have a tech coming out today, as mentioned below I believe I have some noise in my line, my cable is pulled from quite a ways away from my house despite me having a cable box right next to my property. 

chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I'm starting to suspect the T25 is the root of the problem even if your lines are good. The Xfinity tech sent me a Comcast XB6 modem to see if it makes a difference since tech's currently can't be sent out.

 

I haven't had it long enough to determine if the issue is resolved with a different modem, however. 

clasherhic
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

It does seem like the common denominator, but I invested in the modem to save the cost of renting the Comcast modem. Fios includes the router for free. Good luck all, I won't be following this thread any longer. 

N-A-S
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I'm having similar issue with my xfinity/T25 after upgrading my service to 300mbps + Voice & modem from Arris Surfboard SB6121 DOCSIS 3.0 to T25. My old modem was solid for 5 years and now I wonder why oh why did I even bother upgrading; I don't even notice any significance in speed.


Current Service:

X1 TV, Internet & Voice.


My T25 randomly "resets or reboots" not sure exactly what's happening as I haven't got a chance to investigate it. I do notice when I lose internet, the T25 modem front panel LED indicators blink one at a time until they all become solid - That's when the internet comes back up. It happens at least every other day.

 

IIRC my speed less than 200up, less than 20down.

 

 

chrisg23
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

There is something incompatible with the T25 and Comcast's network, I'm certain of it. 

 

Comcast sent me one of their XB6 modems (what I had before I bought the T25) and my connection has been rock solid again, no reboots at midnight every couple days. 

 

I don't know what the solution is, but if anyone is in the market for a modem I would not buy a T25 at this point. 

adecarolis
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

This is an issue on xfinity's end located in their billing department.  I have gigabit internet with unlimited data.  I pay $50 for unlimited data to use my own modem.  With xfinity's modem it's only $30.  (Yes they charge you more to use your own modem for unlimited data)  

 

When covid-19 hit, comcast gave everyone unlimited data for free which didn't play nicely with this modem or any other owned modems.  This is because of how xfinity orginally had it and currently has it set up for users to need to pay more if they own their own modem and want unlimited data.   People who owned their own modem during covid-19 now all had unlimited data and that did correlate correctly with how billing is set up for user owned modems with unlimited data.

 

Recently Xfinity reinstated unlimited data and i'm only have to pay $30 for unlimited data, which is another error on their part.  However, that's why I have a message saying "your bill has changed."  Then when I click on a button that says "review, then approve changes," it wants me to approve to pay $50 for unlimited data since i'm using my own data.  Once accpeted, everything will work again for users with unlimited data.  

 

Users that do not pay for unlimited data should not have any issues now since xfinity reinstated unlimited data and everything is back to normal. 

 

It's rediculous that they made this issue and stated otherwise.  I do believe it was a mistake that they may have not made intentionaly, but with everyone having this issue with owned modems that I know, they should have looked into it.  Xfinity in otherwords used it for their adavantage to get people to use their modems.  I will not give my personal opinion (truth) on that matter here. 

adecarolis
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Forgot to explain the rebooting part...

 

xFi reboots every night.  Just like the cables boxes.  Which is horrible.  

 

Because of the issue mentioned in billing and Xfinity thinking you have an xFi modem, they are sending your modem update signals.  Your modem is not recieving them correctly because it's not the xFi modem.  On Xfinity's end though, they think there is something wrong with the modem so they send a restart signal.  Sometimes they keep sending your modem more update signals right after they restart it, just leaving you more pain.  However, you can fix this right away by manually restarting it by pulling the plug or through the app.

BruceW
Gold Problem Solver

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work


@adecarolis wrote: ... I pay $50 for unlimited data to use my own modem.  With xfinity's modem it's only $30. ...

See "Using your own Internet equipment? Get unlimited data one of two ways" on https://www.xfinity.com/learn/internet-service/data. There are two choices:

 

  • Replace your owned equipment with an xFi Gateway with Unlimited for $25/mo
  • Keep your equipment and add Unlimited for $30/mo
sansjim
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

All,

Not sure if anyone has gotten a resolution to this but this exact issue has been happening to me since I upgraded my Internet to Gig back in July.  I too have a T25 and I called Arris today and they told me that the problem is likely the upstream power.  Arris says that for the modem to work properly the Upstream power should be between 45-51 dBmV.  Mine is between 37-40.  I also notice that the folks that posted here are below 40 as well.  Arris recommended that I contact Xfinity and tell them to "Increase upstream power to at least 46dBmV" and that "The Upstream range needs to be within 45-51 dBmV.

 

Arris support also metioned that if first level doesn't help ask for an advanced support person and if that doesn't help ask that they send a technician to troubleshoot the upstream power issues.  I am going to call them tomorrow and I'll post again to let you know how it goes and if boosting the Upstream Power resolves the issue.

BruceW
Gold Problem Solver

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work


@sansjim wrote: ... Arris says that for the modem to work properly the Upstream power should be between 45-51 dBmV.  Mine is between 37-40. ... Arris recommended that I contact Xfinity and tell them to "Increase upstream power to at least 46dBmV" ...

Arris is mistaken. Comcast's signal specs are the ones posted in the Connection Troubleshooting Tips Forum article, which says the Upstream Power Level at the modem should be between +35 dBmV and +50 dBmV.

 

Comcast reps have no control over the upstream power level. It is set automatically by their CMTS equipment. And what's important is not the level at the modem, it's the level (and quality) of the modem's signal as received at Comcast.

sansjim
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

Thanks for the information.  It is interesting because on the FAQs on Arris's site regarding the T25 Cable Signal Levels it states exactly what the Arris technician told me.  Here is the link T25 Cable Signal Levels and a screenshot of the Upstream QAM section.

 

sansjim_0-1601947843055.png

 

I think I will still contact Xfinity tomorrow and ask them about this because if they can't support the vendor recommended upstream levels then the T25 really shouldn't be a supported device.

 

GeorgeX1
Contributor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I keep having these issues with the T25 as well.  After a recent tech visit, he removed the filter that was at my modem and installed a new one outside the house (there was none before).  He also tested signal at the modem and showed me the disparity between what he got and what the modem was reporting -- 45dBmV upstream vs claimed 37 on the T25. 

 

Thus far, I have not had the issues with the modem freezing in the middle of the night (around midnight Eastern) that I had every couple of days.  The run-around from Comcast and Arris was infuriating as is the prospect of having to cave to modem rental or buying a different one.  I never had even 2 or 3 issues with my service for 5+ years on Double Play with 300Mbps and an Arris SB6183.

 

However now, it does occasionally hiccup with MIMO events in the logs and reprovisioning events in the MTA log.  However, unlike before, the modem seems to recover after a few minutes.  Before I would have to restart the modem by unplugging in order for things to come back online.  Very annoying if work is pushing updates over night (as it would be if the XFi modem restarts every night like the DVR).

 

This is the first time I've read about the data cap lift and potential issues with Comcast thinking everyone must therefore have an XFi modem.  Interesting.  I am still leaning towards the T25 being the problem though.

 

Has anyone seen anything to indicate that the Netgear CM1150V has the same issues?

SugaCookie
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

 I've been having this issue since upgrading our cable modem to the T25. Comcast even coaxed me into upgrading to the Gig-speed, mentioning my current plan was too slow for the new modem. Not mad at the upgrade, loving the speed thus far but that didn't fix my issue. 

 

I've talked to Arris, who also said the signal levels are not within Spec. Talked to Comcast who also said they do not control those levels... 

I've had Comcast come out two times. On the first visit, they switched my modern to their Xfi one for a few weeks test. I had no reboots during that time. I recently returned that modem since the trial ended and they started charging me. Once I returned the device I started having the same issues. 

I had Comcast run a brand new line to my house, and the second time Comcast came out tested all the signals and corrected a noise issue coming from a bad DVR box. Despite, new line, signal testing I still get the T25 Modem reboots every couple of days. 

 

I really believe its a T25 issue, and that it should not be on the approved list since Comcast cant provided Min required signal levels. 

SugaCookie
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

 

***Edit, the issue still remains, it went an extra day before the modem rebooted. I think I have officially run out of ideas and Comcast has been unable to fix the issue after 3 visits. I guess ill just keep following this thread and hope someone has found a solution. ** 

 

 

Hello Everyone. I may have solved my rebooting problem, but more time is needed to call this a total success. After having Comcast come out 3 times and run a new cable line to the house and run multiple signal strength tests with no reported issues, I decided to look into my cable routing. When the house was purchased, I ran all new RG6 lines to each room of the house along with Cat6. The lines all centralize into one area that split the main lines through two splitters. 

 

My hypothesis was that the T25 needed more signal strength, and my splitters (Though Comcast Approved) could not provide the minimum specs. 

 

So what I did was relocate my T25 Modem to the central cable run location, ran a new short RG6 line, and purchased a new high-quality splitter.

https://www.amazon.com/gp/product/B07TV2LZCP/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

 

I then took the Mainline (From the street) and put it into the new splitter. I then split one (Out) directly to the Cable modem and the other (Out) to my two other splitters running TV to all the rooms. So far so good. 

 

It might be worth a shot, as the splitter, it not crazy expensive. I noticed my current splitters were up to 1250 Mhz and this new one goes to 2500 Mhz. **Keep in mind, I don't really know what the rating means. :)**

 

Cheers!

EG
Expert

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work


@SugaCookie wrote:

 

It might be worth a shot, as the splitter, it not crazy expensive. I noticed my current splitters were up to 1250 Mhz and this new one goes to 2500 Mhz. **Keep in mind, I don't really know what the rating means. :)**


FWIW, bear in mind that that splitter is engineered more for satellite systems, not cable systems. It can actually make performance worse by allowing line noise ingress at those higher frequencies that cable systems do not operate on.

Here are some quality brand splitters that Comcast actually uses in different market areas;

Antronix CMC2002H 2-Way Splitter: http://www.amazon.com/Antronix-CMC2002H-2-Way-Splitter/dp/B001E4OH1E

Regal 2 WAY 1 GHZ Splitter: http://www.amazon.com/DIG702867-Regal-WAY-GHZ-SPLITTER/dp/B0018BQMUM/ref=sr_1_2?s=electronics&ie=UTF...

Extreme Broadband BDS102H 2-Way Digital Coax Splitter: http://www.amazon.com/EXTREME-DIGITAL-PERFORMANCE-CABLE-SPLITTER/dp/B007YV0UQW

Holland 2-way horizontal splitter 5-1000 MHz with ground.http://www.3starinc.com/holland_2-way_horizontal_splitter_5-1000_mhz-w-ground.html

Sv-2g 2-way Splitter 5-1000mhz: http://www.amazon.com/Sv-2g-2-way-Splitter-5-1000mhz-Sv2g/dp/B003TH36CK










I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
SugaCookie
Frequent Visitor

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

The splitters I am using are Antronix 3 way 5-1002 MHz. Using two of them feeding 5 rooms.

Now is it possible that the splitters you suggested need to be reevaluated given the increase in internet speeds over the years?

Also out of curiosity and education what’s the MHz rating mean on the splitters and also the db rating on the outputs mean?

Thanks!
EG
Expert

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work


@SugaCookie wrote:

Now is it possible that the splitters you suggested need to be reevaluated given the increase in internet speeds over the years?

Nope. Those are current. The bandpass range of a splitter has nothing to do with speeds.

 



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Simca
New Poster

Re: Modem Keeps Rebooting around Midnight, Causing Issues with Work

I also have a T25 modem and the same issue as everyone else.

 

Modem reboots itself between 12:15 AM EST and 12:30 AM EST every 3-5 nights, like clockwork. I had a technician out to look at the issue, but the line is brand new and there is no splitter.

 

I figured there was something wrong with the connection in our area. Then I moved (for unrelated reasons) to a different place across town. Identical issue at the same time every day. I've effectively eliminated every possible cause except the modem itself. Could the signal quality in both houses actually be an issue (this house is less than 20 years old, though)?

 

I have problems believing this is a signal quality issue. Why does the modem restart slightly after midnight EST for everyone here? It did this restarting thing for me in the exact time window at two completely different houses! I mean, even if you try to argue that this is a signal noise issue relating to temperature changes in wiring or something (in terms of -why- it happens at this time, that's one possible explanation), the time frame here is not believable. Something seems wrong with the firmware on the modem itself if it restarts consistently in the same time frame across multiple environmental variables.

 

Is there truly no technical solution to this? Is this problem happening to so few customers that Arris and/or Comcast don't care enough? If I were Comcast, I'd check to see what percentage of T25 modem owners experience connection blips in this time frame each night.

 

For whatever it's worth, I live in Southwest Florida and not Virginia.