Extended upstream transmit power - CAX80

[My_Username]

Cable diagnostics say I have a poor connection due to upstream power. See diagnostic output below.

I see that extended upstream transmit power is checked. I can click on the setting but nothing changes. It remains checked and light green.

Should I be able to change this or is it under Comcast control?

------------------------

Cable Diagnostic

Status: Poor

Action:
[Upstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required splitters.
4) Contact your service provider for troubleshooting help.

Internet Access: Good

Downstream Status: Good

Downstream Power Level: Good

Downstream SNR: Good

Upstream Status: Poor

Upstream Power Level: Poor
Upstream power is poor (29.5dBmV). The recommended level is from 30 to 55dBmV.

Current time: Wed Nov 17 13:17:35 2021

Startup Procedure
Acquire Downstream Channel: 579 MHz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+

Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked 256 QAM 25 579000000 Hz -7.3 dBmV 38.2 dB 27 0
2 Locked 256 QAM 1 417000000 Hz -3.9 dBmV 39.9 dB 18 0
3 Locked 256 QAM 2 423000000 Hz -4 dBmV 39.8 dB 49 0
4 Locked 256 QAM 3 435000000 Hz -4.2 dBmV 39.8 dB 43 23
5 Locked 256 QAM 4 447000000 Hz -4.7 dBmV 39.6 dB 22 16
6 Locked 256 QAM 5 453000000 Hz -4.8 dBmV 39.6 dB 14 24
7 Locked 256 QAM 6 459000000 Hz -5.1 dBmV 39.4 dB 12 27
8 Locked 256 QAM 7 465000000 Hz -5.1 dBmV 39.3 dB 13 26
9 Locked 256 QAM 8 471000000 Hz -5.2 dBmV 39.3 dB 21 16
10 Locked 256 QAM 9 477000000 Hz -5.3 dBmV 39.3 dB 32 4
11 Locked 256 QAM 10 483000000 Hz -5.5 dBmV 39.2 dB 8 0
12 Locked 256 QAM 11 489000000 Hz -5.7 dBmV 39.1 dB 7 0
13 Locked 256 QAM 12 495000000 Hz -5.8 dBmV 39 dB 30 0
14 Locked 256 QAM 13 507000000 Hz -6 dBmV 39 dB 34 0
15 Locked 256 QAM 14 513000000 Hz -5.9 dBmV 39.1 dB 30 0
16 Locked 256 QAM 15 519000000 Hz -6 dBmV 39 dB 35 0
17 Locked 256 QAM 16 525000000 Hz -6.1 dBmV 39 dB 49 0
18 Locked 256 QAM 17 531000000 Hz -6.1 dBmV 38.9 dB 38 5
19 Locked 256 QAM 18 537000000 Hz -6.3 dBmV 38.9 dB 27 24
20 Locked 256 QAM 19 543000000 Hz -6.3 dBmV 38.9 dB 24 26
21 Locked 256 QAM 20 549000000 Hz -6.2 dBmV 38.9 dB 31 29
22 Locked 256 QAM 21 555000000 Hz -6.4 dBmV 38.8 dB 49 13
23 Locked 256 QAM 22 561000000 Hz -6.7 dBmV 38.5 dB 16 0
24 Locked 256 QAM 23 567000000 Hz -7 dBmV 38.5 dB 29 0
25 Locked 256 QAM 24 573000000 Hz -7.2 dBmV 38.3 dB 16 0
26 Locked 256 QAM 26 585000000 Hz -7.2 dBmV 38.3 dB 27 0
27 Locked 256 QAM 27 591000000 Hz -7.3 dBmV 38.2 dB 19 0
28 Locked 256 QAM 28 597000000 Hz -7.2 dBmV 38.1 dB 19 0
29 Locked 256 QAM 29 603000000 Hz -7.1 dBmV 38.1 dB 33 0
30 Locked 256 QAM 30 609000000 Hz -7.1 dBmV 38.1 dB 35 0
31 Locked 256 QAM 31 615000000 Hz -7.1 dBmV 38.1 dB 34 0
32 Locked 256 QAM 32 621000000 Hz -7.2 dBmV 38.1 dB 42 0

Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 37.8 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 29.5 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 30.8 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 31.5 dBmV
5 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 33.0 dBmV
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0

Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 ,3 159 722000000 Hz -8.52 dBmV 36.8 dB 1306 ~ 2789 13944357022 6543801972 0
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0

Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV

[olympos1625]

Hi My_Username,

Thank you for reaching out. We are sorry for not being able to get back to you immediately. Are you still having issues with your Upstream? Please send us the event logs of the Cable modem.

https://kb.netgear.com/30008/How-do-I-obtain-the-event-logs-from-a-NETGEAR-cable-modem-modem-router

Please do not hesitate to let me know if you need further assistance. 

Regards,

Oliver

Community Team

[My_Username]

Cable diagnostics still indicate that the connection is poor due to upstream power. Upstream power signal level is currently running between 27.0dBmV and 35.5dBmV. Extended upstream transmit power is enabled and I cannot toggle that setting. I assume that setting is part of Xfinity provisioning.

The system seems to be functioning and the speed test indicates I am getting better than my contract 300Mbps. I am just concerned that modem diagnostics flags the connection as poor due to upstream power.

The modem log follows:

Fri Dec 10 20:01:49 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:01:16 2021	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:01:12 2021	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1.;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:00:44 2021	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:55 1970	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Thu Jan 1 00:00:44 1970	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Wed Dec 8 18:42:42 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 22:46:23 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 17:37:09 2021	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:43 1970	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 09:48:41 2021	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:02:59 1970	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 3 21:52:16 2021	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;

[My_Username]

My current cable diagnostic report is copied below.

Cable Diagnostic

Status: Poor

Action:
[Upstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required splitters.
4) Contact your service provider for troubleshooting help.

Internet Access: Good

Downstream Status: Good

Downstream Power Level: Good

Downstream SNR: Good

Upstream Status: Poor

Upstream Power Level: Poor
Upstream power is poor (27.0dBmV). The recommended level is from 30 to 55dBmV.

Current time: Sat Dec 11 12:14:59 2021

Startup Procedure
Acquire Downstream Channel: 549 MHz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+

Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked 256 QAM 20 549000000 Hz -3.4 dBmV 43.2 dB 0 0
2 Locked 256 QAM 13 507000000 Hz -3.1 dBmV 43.4 dB 7 0
3 Locked 256 QAM 14 513000000 Hz -3.3 dBmV 43.3 dB 0 0
4 Locked 256 QAM 15 519000000 Hz -3.3 dBmV 43.3 dB 0 0
5 Locked 256 QAM 16 525000000 Hz -3.2 dBmV 43.4 dB 0 0
6 Locked 256 QAM 17 531000000 Hz -3.2 dBmV 43.4 dB 0 0
7 Locked 256 QAM 18 537000000 Hz -3.3 dBmV 43.3 dB 0 0
8 Locked 256 QAM 19 543000000 Hz -3.4 dBmV 43.3 dB 0 0
9 Locked 256 QAM 21 555000000 Hz -3.4 dBmV 43.2 dB 0 0
10 Locked 256 QAM 22 561000000 Hz -3.7 dBmV 43 dB 0 0
11 Locked 256 QAM 23 567000000 Hz -3.9 dBmV 42.8 dB 0 0
12 Locked 256 QAM 24 573000000 Hz -4.2 dBmV 42.6 dB 0 0
13 Locked 256 QAM 25 579000000 Hz -4.3 dBmV 42.5 dB 0 0
14 Locked 256 QAM 26 585000000 Hz -4.3 dBmV 42.4 dB 0 0
15 Locked 256 QAM 27 591000000 Hz -4.2 dBmV 42.4 dB 0 0
16 Locked 256 QAM 28 597000000 Hz -4.1 dBmV 42.5 dB 0 0
17 Locked 256 QAM 29 603000000 Hz -3.9 dBmV 42.6 dB 0 0
18 Locked 256 QAM 30 609000000 Hz -3.8 dBmV 42.7 dB 0 0
19 Locked 256 QAM 31 615000000 Hz -3.7 dBmV 42.8 dB 0 0
20 Locked 256 QAM 32 621000000 Hz -3.9 dBmV 42.6 dB 0 0
21 Locked 256 QAM 33 627000000 Hz -3.9 dBmV 42.6 dB 0 0
22 Locked 256 QAM 34 633000000 Hz -4 dBmV 42.5 dB 0 0
23 Locked 256 QAM 35 639000000 Hz -4.3 dBmV 42.3 dB 0 0
24 Locked 256 QAM 36 645000000 Hz -4.6 dBmV 42.1 dB 0 0
25 Locked 256 QAM 37 651000000 Hz -4.8 dBmV 41.8 dB 0 0
26 Locked 256 QAM 38 657000000 Hz -5.2 dBmV 41.6 dB 0 0
27 Locked 256 QAM 39 663000000 Hz -5.3 dBmV 41.4 dB 0 0
28 Locked 256 QAM 40 669000000 Hz -5.5 dBmV 41.2 dB 0 0
29 Locked 256 QAM 41 675000000 Hz -5.5 dBmV 39.6 dB 0 0
30 Locked 256 QAM 42 681000000 Hz -5.7 dBmV 41.1 dB 0 0
31 Locked 256 QAM 43 687000000 Hz -5.5 dBmV 41.2 dB 0 0
32 Locked 256 QAM 44 693000000 Hz -5.5 dBmV 41 dB 0 0

Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 28.8 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 27.0 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 29.5 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 31.3 dBmV
5 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 35.5 dBmV
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0

Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 193 722000000 Hz -5.12 dBmV 40.8 dB 1168 ~ 2927 528915631 44627 0
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0

Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV

Event Log
Time Priority Description
Fri Dec 10 20:01:49 2021 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:01:16 2021 Critical No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:01:12 2021 Notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1.;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 10 20:00:44 2021 Notice TLV-11 - unrecognized OID;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:55 1970 Notice Honoring MDD; IP provisioning mode = IPv6
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Wed Dec 8 18:42:42 2021 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 22:46:23 2021 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 17:37:09 2021 Critical No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:43 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Dec 5 09:48:41 2021 Critical No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:02:59 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Dec 3 21:52:16 2021 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:88:60;CMTS-MAC=00:90:f0:36:00:00;CM-QOS=1.1;CM-VER=3.1;

[FURRYe38]

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. 
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-Mod...
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/