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Posted by Jim T. on April 24, 2006, 9:15 am
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>:
>:> There is a problem with the upstream signal level. At 55 dBmV your
>:> modem is screaming just about as loud as it can in order to make itself
>:> heard, and if the upstream loss increases just a little bit you will
>:> lose the connection. What is the upstream power level with the splitter
>:> removed?
>:
>:Oddly/interestingly enough, upstream reads 55 dBmV either way.
>
>That confirms that the head end is telling your modem, "Yell as loud as
>you can, I can barely hear you." The problem could be your modem not
>putting out as strong a signal as it thinks it is, or it could be
>trouble in the transmission path. The easiest thing to try is a
>replacement modem. Why not just rent a modem from Comcast for a month
>or two. If that fixes the problem you can buy a new modem and cancel
>the rental. If the problem persists, you can now tell Comcast, "It's
>your modem and your system, make it work."
>
>BTW, when you phone in to tech support, they should be able to see
>what your upstream signal level and SNR are at the head end
Comcast ran a separate line to my modem - avoiding all splitters but
the one on the access box. That fixed the upstream # and it has worked
great ever since. Only problem is that they cut the line short so it
can't be tucked away very well.
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