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user_srzp4c
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Tuesday, June 11th, 2024

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upstream power low

My upstream power is low according to my Netgear Cable Diagnostics.

All my cable connections are tight and I have no splitters.

What would be the cause of this? Is this on Xfinity's end?

Regards,

Gerald [Edited: "Personal Information"]

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1 year ago

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strykerzr350

Contributor

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147 Messages

1 year ago

Can you copy and paste your modem logs?

35 to 48 is decent, anything higher or lower is bad.

42 to 46 is the sweet spot.

(edited)

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user_srzp4c

6 Messages

Thanks for your response strykerz350.

Here's the cable diagnostics from my Netgear cable modem:

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 (28.5dBmV). The recommended level is from 30 to 55dBmV.


Current time: Tue Jun 11 15:39:52 2024

Startup Procedure
Acquire Downstream Channel: 507 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      5     507000000 Hz     -3.5 dBmV     42.4 dB     159     0
      2     Locked     256 QAM      1     477000000 Hz     -3.2 dBmV     42.6 dB     127     0
      3     Locked     256 QAM      2     483000000 Hz     -3.1 dBmV     42.7 dB     114     0
      4     Locked     256 QAM      3     489000000 Hz     -3.2 dBmV     42.7 dB     138     0
      5     Locked     256 QAM      4     495000000 Hz     -3.3 dBmV     42.6 dB     142     0
      6     Locked     256 QAM      6     513000000 Hz     -3.8 dBmV     42.4 dB     162     0
      7     Locked     256 QAM      7     519000000 Hz     -4 dBmV     42.3 dB     131     0
      8     Locked     256 QAM      8     525000000 Hz     -4.5 dBmV     42 dB     173     0
      9     Locked     256 QAM      9     531000000 Hz     -4.9 dBmV     41.8 dB     188     0
     10     Locked     256 QAM     10     537000000 Hz     -5.3 dBmV     41.6 dB     205     0
     11     Locked     256 QAM     11     543000000 Hz     -5.5 dBmV     41.5 dB     230     0
     12     Locked     256 QAM     12     549000000 Hz     -5.7 dBmV     41.3 dB     216     0
     13     Locked     256 QAM     13     555000000 Hz     -5.9 dBmV     41.2 dB     240     0
     14     Locked     256 QAM     14     561000000 Hz     -5.8 dBmV     41.2 dB     222     0
     15     Locked     256 QAM     15     567000000 Hz     -5.7 dBmV     41.3 dB     255     0
     16     Locked     256 QAM     16     573000000 Hz     -5.5 dBmV     41.4 dB     263     0
     17     Locked     256 QAM     17     579000000 Hz     -5.3 dBmV     41.4 dB     247     0
     18     Locked     256 QAM     18     585000000 Hz     -5.5 dBmV     41.3 dB     261     0
     19     Locked     256 QAM     19     591000000 Hz     -5.8 dBmV     41.1 dB     290     0
     20     Locked     256 QAM     34     453000000 Hz     -3.1 dBmV     42.9 dB     95     0
     21     Locked     256 QAM     35     459000000 Hz     -3.3 dBmV     42.9 dB     87     0
     22     Locked     256 QAM     36     465000000 Hz     -3.3 dBmV     42.8 dB     129     0
     23     Locked     256 QAM     37     471000000 Hz     -3.3 dBmV     42.8 dB     133     0
     24     Locked     256 QAM     38     405000000 Hz     -3.2 dBmV     43 dB     41     0
     25     Locked     256 QAM     39     411000000 Hz     -3.2 dBmV     42.9 dB     41     0
     26     Locked     256 QAM     40     417000000 Hz     -3.1 dBmV     43 dB     53     0
     27     Locked     256 QAM     41     423000000 Hz     -3 dBmV     43.1 dB     64     0
     28     Locked     256 QAM     42     429000000 Hz     -2.9 dBmV     43.1 dB     36     0
     29     Locked     256 QAM     43     435000000 Hz     -3 dBmV     43 dB     53     0
     30     Locked     256 QAM     44     441000000 Hz     -3.2 dBmV     42.9 dB     75     0
     31     Locked     256 QAM     45     447000000 Hz     -3.1 dBmV     42.9 dB     96     0
     32     Not Locked     Unknown      0     0 Hz     0.0     0.0     0     0


Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      7       5120 Ksym/sec       22800000 Hz       28.8 dBmV
      2       Locked       ATDMA      5       5120 Ksym/sec       35600000 Hz       30.3 dBmV
      3       Locked       ATDMA      6       5120 Ksym/sec       29200000 Hz       29.5 dBmV
      4       Locked       ATDMA      8       5120 Ksym/sec       16400000 Hz       28.5 dBmV
      5       Locked       ATDMA     10       1280 Ksym/sec       39600000 Hz       37.3 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     29     690000000 Hz     -7.02 dBmV     39.2 dB     1228 ~ 2867     2736249764     2675645170     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
Tue Jun 11 02:11:25 2024     Critical     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;
Mon Jun 10 15:34:25 2024     Notice     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;
Mon Jun 10 15:34:15 2024     Notice     TLV-11 - unrecognized OID;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:01:03 1970     Notice     Honoring MDD; IP provisioning mode = IPv6
Thu Jan  1 00:00:57 1970     Critical     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;
Thu Jan  1 00:00:53 1970     Critical     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;
Sun Jun  9 19:48:20 2024     Critical     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;
Fri Jun  7 22:04:00 2024     Critical     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;
Thu Jun  6 17:59:23 2024     Critical     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;
Thu Jun  6 08:42:37 2024     Critical     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;
Wed Jun  5 20:08:07 2024     Critical     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;
Mon Jun  3 19:50:40 2024     Critical     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;
Thu Jan  1 00:01:12 1970     Critical     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;
Thu Jan  1 00:00:58 1970     Critical     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;
Thu Jan  1 00:00:54 1970     Critical     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;
Thu Jan  1 00:00:57 1970     Critical     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;
Thu Jan  1 00:00:53 1970     Critical     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;
Sat Apr 20 10:53:30 2024     Critical     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;
Sat Apr 20 10:53:25 2024     Critical     SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sat Apr 20 10:48:38 2024     Critical     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;
Wed Apr  3 08:17:47 2024     Critical     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;
Tue Mar 26 20:30:41 2024     Critical     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;
Fri Feb 16 13:10:19 2024     Critical     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;
Fri Feb 16 13:10:13 2024     Critical     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;
Fri Feb 16 13:10:08 2024     Critical     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;
Fri Feb 16 13:09:53 2024     Critical     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;
Thu Jan 18 21:27:33 2024     Critical     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;
Thu Jan  4 09:01:02 2024     Critical     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;
Thu Jan  1 00:00:49 1970     Critical     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;
Thu Jan  1 00:00:43 1970     Critical     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;
Thu Dec 28 00:01:38 2023     Critical     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;
Thu Dec 28 00:01:32 2023     Critical     SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:02:39 1970     Critical     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;
Thu Jan  1 00:00:46 1970     Critical     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)

1 year ago

0

EG

Expert

 • 

114.3K Messages

1 year ago

Are you actually experiencing any connectivity problems ?

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EG

Expert

 • 

114.3K Messages

1 year ago

@user_srzp4c 

You could try using a return path attenuator to raise the transmit power of the modem to help the signal to be higher than the noise floor. I would try using a 9 dB one and see. YMMV.

https://www.tonercable.com/product/rpa42-return-path-attenuator-3-6-9-12-15-db-values/ 

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