Conference calls are pausing for several seconds multiple times a day

[Limeybigdog]

I have been have issues with my conference calls pausing during the day.  Some days are worse than others and I have to wait for them to reconnect.  I hve been trying to get to the root cuase and tracking when they happen to look at varous logs on my router.  Last night I decided to look at my modem and foudn that there is a correlation with the timing and this error on my modem - Started Unicast Maintenance Ranging - No Response received - T3 time-out.  Not sure if this is the cause so loking for input and possible resolution.

The issue occures if I am wireless or direct to the modem.  Modem is 2 mnths old and a Netgear CM1100.  There is one splitter in the house and nly one cable going to the modem.  No TV or phone service.

Thanks

[EG]

Start with the modem's signal stats. Perhaps they already are, or they are close to being out of spec and intermittently they go completely of spec. Try getting them here http://192.168.100.1 or here http://10.0.0.1

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

What is the exact make and model number of the modem ?

[Limeybigdog]

The modem is Netgear CM1100.

Here is the informatino that I could pull down.  I had just rebooted if that makes a difference.

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure Status Comment Acquire Downstream Channel 651000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 33 651000000 Hz -2.5 dBmV 42.7 dB 17211114 0 0 2 Locked QAM256 9 507000000 Hz -2.7 dBmV 41.7 dB 16112531 0 0 3 Locked QAM256 10 513000000 Hz -2.7 dBmV 42.6 dB 16116337 0 0 4 Locked QAM256 11 519000000 Hz -2.6 dBmV 38.8 dB 16119756 0 0 5 Locked QAM256 12 525000000 Hz -2.6 dBmV 42.6 dB 16123463 0 0 6 Locked QAM256 13 531000000 Hz -2.9 dBmV 43.1 dB 16127349 0 0 7 Locked QAM256 14 537000000 Hz -2.7 dBmV 42.9 dB 16131018 0 0 8 Locked QAM256 15 543000000 Hz -3.0 dBmV 42.8 dB 16134771 0 0 9 Locked QAM256 16 549000000 Hz -2.8 dBmV 37.3 dB 16138699 0 0 10 Locked QAM256 17 555000000 Hz -2.9 dBmV 41.0 dB 16141967 0 0 11 Locked QAM256 18 561000000 Hz -2.8 dBmV 42.9 dB 16145972 0 0 12 Locked QAM256 19 567000000 Hz -2.9 dBmV 42.8 dB 16149726 0 0 13 Locked QAM256 20 573000000 Hz -3.0 dBmV 42.7 dB 16153561 0 0 14 Locked QAM256 21 579000000 Hz -2.5 dBmV 42.4 dB 16157003 0 0 15 Locked QAM256 22 585000000 Hz -3.0 dBmV 42.3 dB 16160812 0 0 16 Locked QAM256 23 591000000 Hz -2.4 dBmV 42.7 dB 16164866 0 0 17 Locked QAM256 24 597000000 Hz -3.0 dBmV 42.5 dB 16168154 0 0 18 Locked QAM256 25 603000000 Hz -2.4 dBmV 42.7 dB 16172039 0 0 19 Locked QAM256 26 609000000 Hz -2.9 dBmV 42.7 dB 16175779 0 0 20 Locked QAM256 27 615000000 Hz -2.7 dBmV 42.7 dB 16180393 0 0 21 Locked QAM256 28 621000000 Hz -2.7 dBmV 42.6 dB 16184442 0 0 22 Locked QAM256 29 627000000 Hz -2.8 dBmV 42.6 dB 16188109 0 0 23 Locked QAM256 30 633000000 Hz -2.7 dBmV 42.5 dB 16191767 0 0 24 Locked QAM256 31 639000000 Hz -2.6 dBmV 42.7 dB 16195408 0 0 25 Locked QAM256 32 645000000 Hz -2.6 dBmV 42.7 dB 16199444 0 0 26 Locked QAM256 34 657000000 Hz -2.7 dBmV 42.6 dB 16203080 0 0 27 Locked QAM256 35 663000000 Hz -2.4 dBmV 42.6 dB 16206420 0 0 28 Locked QAM256 36 669000000 Hz -2.6 dBmV 42.6 dB 16210452 0 0 29 Locked QAM256 37 675000000 Hz -2.2 dBmV 42.0 dB 16214085 0 0 30 Locked QAM256 38 681000000 Hz -2.9 dBmV 42.4 dB 16218021 0 0 31 Locked QAM256 39 687000000 Hz -2.3 dBmV 42.6 dB 16221231 0 0 32 Locked QAM256 40 693000000 Hz -2.6 dBmV 42.4 dB 16220642 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 5 36500000 Hz 44.3 dBmV 2 Locked ATDMA 6 30100000 Hz 44.3 dBmV 3 Locked ATDMA 7 23700000 Hz 44.3 dBmV 4 Locked ATDMA 8 17300000 Hz 44.3 dBmV 5 Not Locked Unknown 0 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Hz 0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked 0 159 702000000 Hz -1.6 dBmV 37.0 dB 1126 ~ 2969 13686120 73204 0 2 Not Locked 0 0 0 Hz -2.1 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked Unknown 0 0 Hz 0 dBmV 2 Not Locked Unknown 0 0 Hz 0 dBmV

Current System Time: Tue Feb 16 14:41:05 2021

System Up Time: 0:06:40

As I track the times it seems to related to the critical issues listed below:

Time	Priority	Description
2021-02-16, 14:35:32	Warning (5)	Dynamic Range Window violation
2021-02-16, 14:35:32	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 14:35:32	Warning (5)	Dynamic Range Window violation
2021-02-16, 14:35:32	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 14:35:12	Warning (5)	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 13:38:02	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 11:54:08	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 11:53:59	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 11:36:48	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 10:53:12	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-16, 10:00:56	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-15, 16:55:02	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-15, 16:54:50	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-15, 14:26:46	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 17:23:54	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 17:18:01	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 16:49:56	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 16:15:00	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 15:57:43	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-14, 15:40:18	Critical (3)	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:10:25	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:10:05	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:10:05	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:09:46	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:09:46	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:09:26	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:09:25	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:08:54	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:08:49	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-13, 07:08:46	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 15:35:34	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 15:04:16	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 14:47:38	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 14:08:41	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 13:55:42	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 09:46:24	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;
2021-02-12, 09:41:00	Critical (3)	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:92:a0:90;CMTS-MAC=00:56:2b:77:70:ee;CM-QOS=1.1;CM-VER=3.1;

[EG]

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 !

[Limeybigdog]

Thank you for the support

[EG]

My pleasure !  🙂

[Limeybigdog]

@EG When do you think I will hear something as soem days are really bad and this is distruptive to my job as I am on confernece calls all day?

[ComcastLysaP]

Hey @Limeybigdog

We appreciate you taking time to reach out regarding the issues with your conference calls. As someone who works from home, we want to be sure we get this resolved for you, ASAP.

Let’s get to working on this in a private message. To send a private message, please click my name "ComcastLysa" then select "Send a Message" on the right side.