I was hoping someone would have an answer for me. I currently own 3 modems. Arris SB6193, Netgear CM600, and a newly bought Arris SB8200. My question is why are two of these modems giving me a line quality grade of C or D, (CM 600 and SB8200) and the 6193 returns line quality scores of A. My levels seem fine on all modems.
What is weird is that the Netgear CM600 bonds 24 channels (max in my area) and one channel will return uncorrectable in the 6 digit range.
The SB6193 can only bond 16 and I will have errors on 4 channels uncorrectable, yet that modem always returns line quality grades of A+ to B at the worst.
The new 8200 has been up for about 2 hours now with 0 correctable and uncorrectable but returns a line quality score of D in the test I have run.
Latency, bufferbloat and speed seem fine on all modems. The CM600 and SB8200 speeds peak much higher due to the extra channels I'm assuming.
I'm on Cox Ultimate tier 300/30. I usually see sustained speed of 350 - 370 down due to over provisioning with peak speeds hitting up to 500.
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