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Posted by Eric on April 23, 2006, 10:16 am
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Chuck Wrote: "Oddly/interestingly enough, upstream reads 55 dBmV either
way. The
downstream numbers change favorably, 0 to +2 or +3; 37 db s/n with
splitter out as opposed to -3 dBmV / 35 db s/n with splitter in. "
Looks like your modem is working properly. The cable techs are not.
Sorry you have to live in an area with lousy service. If you can go to
your local office (where the techs are dispatched), ask to speak to a
technical supervisor. Go around 8:30 or so, adn bring along a printout
of your signal.html page and explain the situation. HOPEFULLY, he will
send out a tech who knows what he is doing and get things resolved. Of
course, there's a high likelyhood that the tech sup. won't have a clue
either, but maybe he can find someone who does.
BTW: the upstream tx power level not changing sometimes happens when
you are attched to a Cisco CMTS (the headend equipment that converts
data to radio frequencies). Cisco designed their CMTS to be a little
more tolerant of level changes in favor of high carrier to noise
ratios, at least as far as I can tell. Other manufacturers are much
less tolerant of reciever levels. Often times I can see recive levels
from a misbehaving modem to be -5dB, where on an Arris pizzabox or ADC
'Cuda (yes, that's the name. The guy who first designed the thing has a
blue Plymouth Baracuda) will typically reset a modem if the receive
level falls below -1dB.
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Posted by Chuck Reti on April 24, 2006, 12:35 am
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Thanks all, for the replies and information.
Chuck R.
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