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zatan141
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Tuesday, February 22nd, 2022 4:46 PM

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dBmV power level

I have downstream level of 10 to 8 for dBmV.  Does anyone else get closer to ZERO??

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4 years ago

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EG

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4 years ago

That's a bit on the high side. Are you actually experiencing any connectivity / performance problems ? If not, don't sweat it.

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zatan141

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4 years ago

I got disconnected few night a month.  How can I get this fix?

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EG

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4 years ago

Please copy all of the text in its entirety of the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers and paste them into your next post.


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


Is this a WiFi connection ?


Also. Are there any modem component RF error log entries being shown ? If so, please post them as well in their entirety (copy and paste them, don't post a screenshot) but redact the CM MAC and the CMTS MAC addresses for your privacy. They are considered to be personal information. Personally identifying information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically.

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zatan141

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4 years ago

Cable Connection
 
Apply             Cancel    
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
<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment
Acquire Downstream Channel 507000000 Hz Locked
Connectivity State OK Operational
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 / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 5 507000000 Hz 10.2 dBmV 40.1 dB 54845673 46440 0
2 Locked QAM256 1 483000000 Hz 9.6 dBmV 39.9 dB 53889707 53663 0
3 Locked QAM256 2 489000000 Hz 9.8 dBmV 39.8 dB 53899205 49415 0
4 Locked QAM256 3 495000000 Hz 9.7 dBmV 39.9 dB 53896996 54677 0
5 Locked QAM256 4 501000000 Hz 10.0 dBmV 40.0 dB 53886396 49803 0
6 Locked QAM256 6 513000000 Hz 10.0 dBmV 40.0 dB 53908767 49632 0
7 Locked QAM256 7 519000000 Hz 9.9 dBmV 39.4 dB 53910403 52720 0
8 Locked QAM256 8 525000000 Hz 10.2 dBmV 39.0 dB 53922546 42786 0
9 Locked QAM256 9 531000000 Hz 10.2 dBmV 38.8 dB 53944986 43009 0
10 Locked QAM256 10 537000000 Hz 10.0 dBmV 39.7 dB 53943018 47894 0
11 Locked QAM256 11 543000000 Hz 10.0 dBmV 40.2 dB 53954000 41230 0
12 Locked QAM256 12 549000000 Hz 9.9 dBmV 40.2 dB 53959165 40220 0
13 Locked QAM256 13 555000000 Hz 9.5 dBmV 40.0 dB 53957605 45360 0
14 Locked QAM256 14 561000000 Hz 9.3 dBmV 40.0 dB 53961896 44140 0
15 Locked QAM256 15 567000000 Hz 9.2 dBmV 40.0 dB 53974552 35217 0
16 Locked QAM256 16 573000000 Hz 8.6 dBmV 39.9 dB 53976762 36481 0
17 Locked QAM256 17 579000000 Hz 8.5 dBmV 40.0 dB 54001427 35273 0
18 Locked QAM256 18 585000000 Hz 9.4 dBmV 39.3 dB 54030810 29021 0
19 Locked QAM256 19 591000000 Hz 10.0 dBmV 39.9 dB 54007916 31291 0
20 Locked QAM256 34 459000000 Hz 9.3 dBmV 39.8 dB 53972759 57266 0
21 Locked QAM256 35 465000000 Hz 9.4 dBmV 39.9 dB 53978336 53598 0
22 Locked QAM256 36 471000000 Hz 9.4 dBmV 39.8 dB 53983268 53547 0
23 Locked QAM256 37 477000000 Hz 9.5 dBmV 39.8 dB 53984288 54951 0
24 Locked QAM256 38 429000000 Hz 9.0 dBmV 39.9 dB 53984864 58395 0
25 Locked QAM256 39 435000000 Hz 9.1 dBmV 39.8 dB 53985023 62031 0
26 Locked QAM256 40 441000000 Hz 9.0 dBmV 39.7 dB 53986659 63424 0
27 Locked QAM256 41 453000000 Hz 9.2 dBmV 39.9 dB 53996721 58971 0
28 Locked QAM256 42 405000000 Hz 8.8 dBmV 39.8 dB 53996994 60786 0
29 Locked QAM256 43 411000000 Hz 8.7 dBmV 40.0 dB 53999111 63090 0
30 Locked QAM256 44 417000000 Hz 8.7 dBmV 39.7 dB 53999079 64469 0
31 Locked QAM256 45 423000000 Hz 9.0 dBmV 40.0 dB 54008107 59066 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 35600000 Hz 47.8 dBmV
2 Locked ATDMA 2 29200000 Hz 47.8 dBmV
3 Locked ATDMA 3 22800000 Hz 47.3 dBmV
4 Locked ATDMA 4 16400000 Hz 47.0 dBmV
5 Locked ATDMA 5 40400000 Hz 46.0 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, 1, 2, 3 33 722000000 Hz 12.9 dBmV 38.0 dB 1108 ~ 2987 580198228 341861541 0
2 Not Locked 0 0 0 Hz 6.9 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 22, 2022 13:28:31
System Up Time: 52:50:58
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zatan141

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5 Messages

4 years ago

Netgear c7800

Event Log
      Clear Log              Refresh       
 
Time Priority Description
2022-02-20, 08:38:30 Notice (6) CM-STATUS message sent. Event Type Code: 5; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2022-02-20, 08:38:20 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-02-20, 08:36:47 Critical (3) Resetting the cable modem due to docsDevResetNow
2022-02-16, 05:58:24 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2022-02-16, 05:58:17 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-01-29, 07:14:06 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-01-25, 07:20:14 Critical (3) Resetting the cable modem due to docsDevResetNow
2022-01-01, 15:07:04 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-11-29, 17:55:14 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:39:29 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:39:20 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:39:18 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:38:33 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:38:25 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:38:23 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:37:39 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:37:31 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:37:29 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:36:43 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:36:34 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:36:32 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:35:40 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:35:32 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:35:30 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:34:45 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:34:37 Critical (3) TFTP Request Retries exceeded, CM unable to register
2021-11-09, 08:34:35 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2021-11-09, 08:32:43 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

(edited)

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EG

Expert

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118.6K Messages

4 years ago

This may or may not be the root cause of the problem (YMMV). Is there a drop amplifier on the coax cable line leading to the modem ? If so, try removing / bypassing it and see. If not, you can try installing a -6 dB FPA (Forward Path Attenuator) pad such as this one at the back of the modem to knock that power level down and see. It won't affect the upstream power level (which is in spec).

https://www.amazon.com/line-Signal-Forward-Attenuator-FPA6-54/dp/B07882H96R 

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zatan141

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@EG​ There is a splitter between the c7800 and the cable from outside, have to check what it is.

4 years ago

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