Error on Netgear device: Started Unicast Maintenance Ranging - No Response received - T3 time-out

[Ryan3030]

I am losing my internet connectivity on a daily basis, multiple times a day,  from my Xfinity  400 package.  On average, from a couple of minutes up to an hour. with 10 dropped signals at various times, throughout today.   This problem started at the beginning of the year and is progressively get worse on a daily basis. 

Xfinity came out for a service call yesterday.  The service technician ran several diagnostic tests from the inside of the house and the tested numbers are within the acceptable range of tolerance.  

I have the Netgear CM1150v V4.02.02 that works flawlessly since it was purchased. From the pole to the house, there no splitters attached.  Several years ago Xfinity installed a 5 Port signal booster splitter PPC EV01-5-U/U 

Again, no problems until this year.  I have enclosed my stats and error logs for review and comment. 

The log files below denote the following critical errors  

• Started Unicast Maintenance Ranging - No Response received - T3
• No Ranging Response received - T3 time-out
• SYNC Timing Synchronization failure
• No Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities Ranging Response received - T3 time-out

I need some help with my Xfinity dropping connection and I appreciate any assistance.  

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

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 579000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4)

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 21 579000000 Hz 6.1 dBmV 38.9 dB 0 0 2 Locked QAM256 6 483000000 Hz 5.9 dBmV 39.4 dB 0 0 3 Locked QAM256 7 489000000 Hz 5.9 dBmV 39.3 dB 28 0 4 Locked QAM256 8 495000000 Hz 6 dBmV 39.2 dB 32 1 5 Locked QAM256 9 507000000 Hz 6.2 dBmV 39.3 dB 28 0 6 Locked QAM256 10 513000000 Hz 6.1 dBmV 39.3 dB 1 0 7 Locked QAM256 11 519000000 Hz 6.2 dBmV 39.3 dB 0 0 8 Locked QAM256 12 525000000 Hz 6.2 dBmV 39.2 dB 0 0 9 Locked QAM256 13 531000000 Hz 6.3 dBmV 39.3 dB 0 0 10 Locked QAM256 14 537000000 Hz 6.3 dBmV 39.2 dB 0 0 11 Locked QAM256 15 543000000 Hz 6.3 dBmV 39.2 dB 0 0 12 Locked QAM256 16 549000000 Hz 6.3 dBmV 39.2 dB 0 0 13 Locked QAM256 17 555000000 Hz 6.3 dBmV 39.1 dB 0 0 14 Locked QAM256 18 561000000 Hz 6.3 dBmV 39 dB 0 0 15 Locked QAM256 19 567000000 Hz 6.2 dBmV 39 dB 0 0 16 Locked QAM256 20 573000000 Hz 6.2 dBmV 38.9 dB 0 0 17 Locked QAM256 22 585000000 Hz 6.2 dBmV 38.8 dB 0 0 18 Locked QAM256 23 591000000 Hz 6.1 dBmV 38.8 dB 0 0 19 Locked QAM256 24 597000000 Hz 6.2 dBmV 38.8 dB 0 0 20 Locked QAM256 25 603000000 Hz 6.1 dBmV 38.7 dB 0 0 21 Locked QAM256 26 609000000 Hz 6.1 dBmV 38.6 dB 0 0 22 Locked QAM256 27 615000000 Hz 6 dBmV 38.5 dB 0 0 23 Locked QAM256 28 621000000 Hz 6 dBmV 38.6 dB 0 0 24 Locked QAM256 29 627000000 Hz 6 dBmV 38.5 dB 1 0 25 Locked QAM256 30 633000000 Hz 6.1 dBmV 38.6 dB 0 0 26 Locked QAM256 31 639000000 Hz 5.9 dBmV 38.5 dB 0 0 27 Locked QAM256 32 645000000 Hz 6.1 dBmV 38.6 dB 0 0 28 Locked QAM256 33 651000000 Hz 6 dBmV 38.4 dB 0 0 29 Locked QAM256 34 657000000 Hz 5.9 dBmV 38.3 dB 0 0 30 Locked QAM256 35 663000000 Hz 5.8 dBmV 38.2 dB 0 0 31 Locked QAM256 36 669000000 Hz 5.9 dBmV 38.2 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 41 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 41.8 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 42.3 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 42.5 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Downstream OFDM Channels

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 ,1 ,2 ,3 37 722000000 Hz 6.2 dBmV 37.6 dB 1228 ~ 2867 2080859646 2043288292 0 2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0

Upstream OFDMA Channels

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

[Ryan3030]

Event Log

Time	Priority	Description
Thu Feb 11 20:49:58 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:54:02 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 5; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:53:48 2021	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:53:43 2021	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;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=78:d2:94:59:93:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:45:11 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 5; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:44:58 2021	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:44:53 2021	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;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=78:d2:94:59:93:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:23:52 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 5; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:23:38 2021	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:23:33 2021	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;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=78:d2:94:59:93:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:21:17 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 5; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:21:05 2021	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:21:04 2021	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:21:10 2021	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Tue Feb 09 14:21:01 2021	Warning (5)	Lost MDD Timeout;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:20:54 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:52 2021	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:52 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:46 2021	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:46 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:40 2021	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:16:39 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:15:42 2021	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:15:41 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:13:32 2021	Warning (5)	MDD message timeout;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:13:30 2021	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:13:23 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 14:13:22 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Tue Feb 09 13:57:39 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Mon Feb 08 23:59:49 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Mon Feb 08 23:59:41 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 23; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;CM-QOS=1.1;CM-VER=3.1;
Mon Feb 08 23:59:41 2021	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=78:d2:94:59:93:70;CMTS-MAC=00:01:5c:64:f0:79;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 !

[Ryan3030]

Thank you!

[EG]

My pleasure !

[Ryan3030]

Any luck or updates?   My internet is up and down like a yo-yo. 

Thank you, 

[EG]

I can't know what happens after I escalate something, sorry. I can however try re-escalating this.