Regular Visitor
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4 Messages
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 ?
DCID | Freq | Power | SNR | Modulation | Octets | Correcteds | Uncorrectables | |
Downstream 1 | 33 | 657.00 MHz | 22.90 dBmV | 40.95 dB | 256QAM | 4724592088 | 103 | 0 |
Downstream 2 | 1 | 453.00 MHz | 19.20 dBmV | 40.95 dB | 256QAM | 3161381988 | 4 | 0 |
Downstream 3 | 2 | 459.00 MHz | 19.60 dBmV | 40.37 dB | 256QAM | 3555487662 | 2 | 0 |
Downstream 4 | 3 | 465.00 MHz | 20.00 dBmV | 40.37 dB | 256QAM | 3545429823 | 3 | 0 |
Downstream 5 | 4 | 471.00 MHz | 20.00 dBmV | 40.37 dB | 256QAM | 3186207648 | 2 | 0 |
Downstream 6 | 5 | 477.00 MHz | 19.90 dBmV | 40.37 dB | 256QAM | 3623763265 | 4 | 0 |
Downstream 7 | 6 | 483.00 MHz | 20.00 dBmV | 40.37 dB | 256QAM | 3445494807 | 1 | 0 |
Downstream 8 | 7 | 489.00 MHz | 20.20 dBmV | 40.95 dB | 256QAM | 3481077163 | 7 | 0 |
Downstream 9 | 8 | 495.00 MHz | 20.60 dBmV | 40.37 dB | 256QAM | 4068891188 | 52132 | 0 |
Downstream 10 | 9 | 519.00 MHz | 21.20 dBmV | 40.37 dB | 256QAM | 3256009354 | 11 | 0 |
Downstream 11 | 10 | 525.00 MHz | 21.30 dBmV | 40.95 dB | 256QAM | 3273862376 | 11 | 0 |
Downstream 12 | 11 | 531.00 MHz | 21.00 dBmV | 40.95 dB | 256QAM | 3312279391 | 21 | 0 |
Downstream 13 | 12 | 537.00 MHz | 21.50 dBmV | 40.37 dB | 256QAM | 3426213358 | 19 | 0 |
Downstream 14 | 13 | 543.00 MHz | 21.40 dBmV | 40.37 dB | 256QAM | 3392334105 | 20 | 0 |
Downstream 15 | 15 | 555.00 MHz | 21.40 dBmV | 40.95 dB | 256QAM | 3351802310 | 31 | 0 |
Downstream 16 | 16 | 561.00 MHz | 21.90 dBmV | 40.37 dB | 256QAM | 3284505141 | 41 | 0 |
Downstream 17 | 17 | 567.00 MHz | 21.50 dBmV | 40.95 dB | 256QAM | 3378141643 | 26 | 0 |
Downstream 18 | 18 | 573.00 MHz | 22.10 dBmV | 40.37 dB | 256QAM | 4001277660 | 48 | 0 |
Downstream 19 | 24 | 609.00 MHz | 22.60 dBmV | 40.37 dB | 256QAM | 4120115287 | 53 | 0 |
Downstream 20 | 28 | 627.00 MHz | 22.20 dBmV | 40.95 dB | 256QAM | 4252913966 | 97 | 0 |
Downstream 21 | 29 | 633.00 MHz | 23.00 dBmV | 40.95 dB | 256QAM | 4373264139 | 105 | 0 |
Downstream 22 | 30 | 639.00 MHz | 22.40 dBmV | 40.37 dB | 256QAM | 4738614317 | 101 | 0 |
Downstream 23 | 31 | 645.00 MHz | 23.30 dBmV | 40.37 dB | 256QAM | 3921174434 | 88 | 0 |
Downstream 24 | 32 | 651.00 MHz | 22.50 dBmV | 40.37 dB | 256QAM | 4288086714 | 121 | 0
|
Upstream
UCID | Freq | Power | Channel Type | Symbol Rate | Modulation | |
Upstream 1 | 1 | 17.30 MHz | 40.50 dBmV | DOCSIS2.0 (ATDMA) | 5120 kSym/s | 64QAM |
Upstream 2 | 4 | 36.50 MHz | 37.50 dBmV | DOCSIS2.0 (ATDMA) | 5120 kSym/s | 64QAM |
Upstream 3 | 3 | 30.10 MHz | 38.50 dBmV | DOCSIS2.0 (ATDMA) | 5120 kSym/s | 64QAM |
Upstream 4 | 2 | 23.70 MHz | 39.00 dBmV | DOCSIS2.0 (ATDMA) | 5120 kSym/s | 64QAM |
EG
Expert
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107.4K Messages
4 years 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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107.4K Messages
4 years 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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dugs_123
Regular Visitor
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4 Messages
4 years 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.
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dugs_123
Regular Visitor
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4 Messages
4 years ago
Thanks for the link to product. Tomorrow I have the tech visiting my place to check power lowels.
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EG
Expert
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107.4K Messages
4 years ago
O/k good luck with it ! Please post back with how things turn out.
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EG
Expert
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107.4K Messages
4 years ago
Thanks for posting back !
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dugs_123
Regular Visitor
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4 Messages
4 years 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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