Here's what my problem is, and what Comcast did today...
My modem will all of the sudden either totally drop off line, (no pings to Def GW) or begin suffering from packet loss ~22%, enough to really notice it. My ScientificAtlanta cable box indicates -12dbmV at 603Mhz, that's as best a test as I can do myself, for the downstream freq.
Comcast sent a guy out who measured signal at 54Mhz (channel 2 - 4) and said I had good stregnth at +10dbmV at the demarc in my basement. He said he'd have to have the pole-climbers come out to check things outside. He also didn't have a spare modem for me either.
He did nothing to examine my downstream signal, or the strength / quality of my upstream signal as it terminates against the CMTS. Once again, Comast doesn't seem to know that they own, operate & support a data network. Measuring how much signal I see in my house on cable-channel 2 isn't going to tell very much about how the cablemodem is operating on the HFC network.
Anything I can tell comcast to make sure I'm talking to the right people to troubleshoot my issue described above? Have any people already experienced this issue & solved it? Let me know!