SB8200 speed capped at 250mbps

[Kmmenard21]

I just upgraded to Gigabit service and have an Arris SB8200.  I just had a tech here and he confirmed that the speed coming into the house is 1gbps, however when we checked the speed out of the modem it was being capped at 250mbps.  There were instances of 300mbps.

I just spoke with Arris customer support and the recommended cable signal levels for the modem are as follows:

Downstream power levels - -15 dBmV to 15 dBmV

Downstream SNR - 33 dB or greater

Upstream power levels - 45 dBmV to 51 dBmV

The first two meet the spec, but the upstream power levels are at 42 dBmV and that I should have the signal adjusted.  Is this correct path to get the speed I am signed up for?

[EG]

No. That's nonsense. Arris is wrong ! It's something else causing the problem.

[Kmmenard21]

OK, so while I appreciate the previous response, it doesn't really give a path forward.  If it isn't the power specs Arris says they need, any ideas on what else I can check to try to resolve this issue?

[CCAndrew]

The first two meet the spec, but the upstream power levels are at 42 dBmV and that I should have the signal adjusted
_________
What exactly are your specs? If Arris, gave you the wrong range of levels to check, maybe you aren’t meeting them

[Kmmenard21]

They gave this link for the specs.

https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Cable-Signal-Levels

Here is what I get from the router for test results

Startup Procedure
Procedure	Status	Comment
Acquire Downstream Channel	657000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels
Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
33	Locked	QAM256	657000000 Hz	4.1 dBmV	42.3 dB	0	0
1	Locked	QAM256	465000000 Hz	3.1 dBmV	41.7 dB	0	0
2	Locked	QAM256	471000000 Hz	3.2 dBmV	41.8 dB	0	0
3	Locked	QAM256	477000000 Hz	3.5 dBmV	41.9 dB	0	0
5	Locked	QAM256	489000000 Hz	3.0 dBmV	41.7 dB	0	0
6	Locked	QAM256	495000000 Hz	3.1 dBmV	41.7 dB	0	0
7	Locked	QAM256	501000000 Hz	2.9 dBmV	41.6 dB	0	0
8	Locked	QAM256	507000000 Hz	2.9 dBmV	41.8 dB	0	0
9	Locked	QAM256	513000000 Hz	3.0 dBmV	41.7 dB	0	0
10	Locked	QAM256	519000000 Hz	3.1 dBmV	41.8 dB	0	0
11	Locked	QAM256	525000000 Hz	3.0 dBmV	41.7 dB	0	0
12	Locked	QAM256	531000000 Hz	3.0 dBmV	41.8 dB	0	0
13	Locked	QAM256	537000000 Hz	3.2 dBmV	41.8 dB	0	0
14	Locked	QAM256	543000000 Hz	2.8 dBmV	41.7 dB	0	0
15	Locked	QAM256	555000000 Hz	3.0 dBmV	41.8 dB	0	0
16	Locked	QAM256	561000000 Hz	2.8 dBmV	41.7 dB	0	0
17	Locked	QAM256	567000000 Hz	2.8 dBmV	41.8 dB	0	0
18	Locked	QAM256	573000000 Hz	2.8 dBmV	41.8 dB	0	0
19	Locked	QAM256	579000000 Hz	2.9 dBmV	41.9 dB	0	0
20	Locked	QAM256	585000000 Hz	3.4 dBmV	42.1 dB	0	0
21	Locked	QAM256	591000000 Hz	3.3 dBmV	42.1 dB	0	0
22	Locked	QAM256	597000000 Hz	3.5 dBmV	42.0 dB	0	0
23	Locked	QAM256	603000000 Hz	3.4 dBmV	42.0 dB	0	0
24	Locked	QAM256	609000000 Hz	3.4 dBmV	42.1 dB	0	0
25	Locked	Other	690000000 Hz	3.9 dBmV	41.0 dB	582150631	244
26	Not Locked	QAM256	0 Hz	0.0 dBmV	42.1 dB	0	0
27	Locked	QAM256	621000000 Hz	3.5 dBmV	42.1 dB	0	0
28	Locked	QAM256	615000000 Hz	3.4 dBmV	42.1 dB	0	0
29	Locked	QAM256	627000000 Hz	3.5 dBmV	42.3 dB	0	0
30	Locked	QAM256	633000000 Hz	3.7 dBmV	42.1 dB	0	0
31	Locked	QAM256	639000000 Hz	3.6 dBmV	42.3 dB	0	0
32	Locked	QAM256	645000000 Hz	4.0 dBmV	42.1 dB	0	0

Upstream Bonded Channels
Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	8	Locked	SC-QAM Upstream	16600000 Hz	6400000 Hz	42.0 dBmV
2	5	Locked	SC-QAM Upstream	35800000 Hz	6400000 Hz	42.0 dBmV
3	6	Locked	SC-QAM Upstream	29400000 Hz	6400000 Hz	42.0 dBmV
4	7	Locked	SC-QAM Upstream	23000000 Hz	6400000 Hz	42.0 dBmV

Current System Time: Mon May 18 07:15:42 2020