Power Levels too high ??

Question

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 · Answer

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.

EG · Answer

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

dugs_123 · Answer

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.

dugs_123 · Answer

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

EG · Answer

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

EG · Answer

Thanks for posting back !

dugs_123 · Answer

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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Power Levels too high ??

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