dugs_123's profile

Regular Visitor

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4 Messages

Mon, Nov 2, 2020 8:00 PM

Power Levels too high ??

I have Arriss SBG7400AC2 wifi modem router and currently experiencing intermittent network connectivity issue and slow speed (sometimes 200 Mbps on a 300 Mbps plan) . I checked with the Arris customer support. They said the power levels are out of line and provided below recommendation : 

 

For Downstream Channel the accepted power level is -15 to +15 dbmv.
For SNR downstream it should be greater than 33 db.
For upstream channel the accepted range for power level is +45 to +51 dbmv.

 

Currently , my power levels are shown below. Is there any way to adjust these levels or only comcast tech can do it ? There are no splitters involved. It is coz direct from wall to the router. 

 

Also ,what is the optimum level ? 

 

 

DCIDFreqPowerSNRModulationOctetsCorrectedsUncorrectables
Downstream 133657.00 MHz22.90 dBmV40.95 dB256QAM47245920881030
Downstream 21453.00 MHz19.20 dBmV40.95 dB256QAM316138198840
Downstream 32459.00 MHz19.60 dBmV40.37 dB256QAM355548766220
Downstream 43465.00 MHz20.00 dBmV40.37 dB256QAM354542982330
Downstream 54471.00 MHz20.00 dBmV40.37 dB256QAM318620764820
Downstream 65477.00 MHz19.90 dBmV40.37 dB256QAM362376326540
Downstream 76483.00 MHz20.00 dBmV40.37 dB256QAM344549480710
Downstream 87489.00 MHz20.20 dBmV40.95 dB256QAM348107716370
Downstream 98495.00 MHz20.60 dBmV40.37 dB256QAM4068891188521320
Downstream 109519.00 MHz21.20 dBmV40.37 dB256QAM3256009354110
Downstream 1110525.00 MHz21.30 dBmV40.95 dB256QAM3273862376110
Downstream 1211531.00 MHz21.00 dBmV40.95 dB256QAM3312279391210
Downstream 1312537.00 MHz21.50 dBmV40.37 dB256QAM3426213358190
Downstream 1413543.00 MHz21.40 dBmV40.37 dB256QAM3392334105200
Downstream 1515555.00 MHz21.40 dBmV40.95 dB256QAM3351802310310
Downstream 1616561.00 MHz21.90 dBmV40.37 dB256QAM3284505141410
Downstream 1717567.00 MHz21.50 dBmV40.95 dB256QAM3378141643260
Downstream 1818573.00 MHz22.10 dBmV40.37 dB256QAM4001277660480
Downstream 1924609.00 MHz22.60 dBmV40.37 dB256QAM4120115287530
Downstream 2028627.00 MHz22.20 dBmV40.95 dB256QAM4252913966970
Downstream 2129633.00 MHz23.00 dBmV40.95 dB256QAM43732641391050
Downstream 2230639.00 MHz22.40 dBmV40.37 dB256QAM47386143171010
Downstream 2331645.00 MHz23.30 dBmV40.37 dB256QAM3921174434880
Downstream 2432651.00 MHz22.50 dBmV40.37 dB256QAM4288086714121

0

 

 

 

 

 

 

Upstream

 UCIDFreqPowerChannel TypeSymbol RateModulation
Upstream 1117.30 MHz40.50 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 2436.50 MHz37.50 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 3330.10 MHz38.50 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 4223.70 MHz39.00 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM

 

Responses

EG

Expert

 • 

86.5K Messages

6 m ago

The downstream power is way too high ! Is there a drop amplifier / powered splitter in the coax line that leads to the modem ? If so, remove it.

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EG

Expert

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86.5K Messages

6 m ago

O/k you could try using two of these 6 dB forward / downstream path only attenuator pads cascaded together behind the modem to cut the power down by 12 dB. It will put the downstream power in spec without adversely affecting the upstream power levels.

 

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

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I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!tick

Regular Visitor

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4 Messages

6 m ago

Hi EG,

 

Thanks for your reply. There is nothing in between. The coax cable runs from the wall straight to the router with nothing in between them. 

Regular Visitor

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4 Messages

6 m ago

Thanks for the link to product. Tomorrow I have the tech visiting my place to check power lowels.

EG

Expert

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86.5K Messages

6 m ago

O/k good luck with it ! Please post back with how things turn out.

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I am a Customer Expert volunteering my time to help other customers here in the Forums.
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EG

Expert

 • 

86.5K Messages

6 m ago

Thanks for posting back !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!tick

Regular Visitor

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4 Messages

6 m ago

The tech added a signal attenuator in between  the wall outlet and the modem and blocked the signals coming from other signal outputs. This reduced the high upstream and downstream levels. Currently the downstream is between -8 to +8 . 

 

Thanks !!

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