What is the best way to go about getting Charter to fix low signal levels? They aren't causing any real issues other than if they get too much lower the cable modem loses sync completely (only happened once so far, yesterday). Speeds are fine, I have no problem saturating either direction for hours on end. Given I can't get to the logs on the Cisco modem I can't tell you anything about any correctable or uncorrectable errors.
I'm currently seeing averages around -18 with it going as low as -20. SNR and upstream power are acceptable, borderline depending on which modulation but also could be better.
My incoming circuit looks as follows:
Ground Block on pole -> surge protector on UPS (has about a 2dB loss) -> 8-port powered splitter -> devices
I have the modem on one of the powered ports (the power brick is on the UPS as well so I'm not worried about losing service in an outage). If I put the modem on the VoIP port I will have an additional 3.5 dB loss (it seems there is an internal 3.5 dB leg for the main part of the splitter and another cascaded 3.5 dB leg for the VoIP port as I measure a total of 7 dB loss).
Last week when I rewired the inbound circuit through the UPS I took measurements at different points. Straight off the ground block, through the UPS only and on a powered port of the splitter.
Stright off the ground block had: (-8.8, 38.2), (-7.5, 38.6), (-6.5, 38.7), (-5.7, 39.3)
Through the UPS only had: (-10.8, 37.1), (-9.5, 37.5), (-8.5, 37.8), (-7.8, 38.4)
Finally, on the powered splitter had: (-14.2, 34.5), (-12.8, 35.2), (-11.7, 35.6), (-11.2, 35.9)
Judging by those numbers and what I see now, it looks like over the last week, they've worsened quite a bit. They've always been quite low like this but this is the first time I've had them get low enough to kick me offline.