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Posted by Ron Hunter on June 25, 2005, 4:41 am
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Jim T. wrote:
> On Fri, 24 Jun 2005 15:02:50 -0700, "Mike Rush"
>
>
>>
>>>I've been corresponding with Motorola and talking to Comcast about a
>>>problem that I've posted here before.
>>>I can get a solid internet connection if there is no splitter between
>>>the wall jack and the modem. Power Level reads -1dB and sometimes
>>>-2dB.
>>>With a splitter added so that I can feed the TV tuner, the power level
>>>reads -5dB. While TV reception is fine, I cannot get and maintain an
>>>internet connection. Have tried several splitters, changed cables and
>>>whatever without success.
>>>The software level is 2.3.1.3 FWIW
>>>Motorola says that the modem should work with the level between -15
>>>and 15. Why should I not suspect the modem itself? Guess I don't
>>>understand how the modem works. There seems to be very little that I
>>>can do muself - everything has to be done by the ISP.
>>
>>The modem also has to transmit upstream from your house to the cable company
>>headend. It's possible that it is borderline and the splitter is enough to
>>drop it off. The same diagnostics pages that show you the -5 power level
>>should show a transmit or upstream power level as well. Most modems max out
>>at 60 dBmv or so, ideal is between 40 and 55. If yours is at the high end,
>>that would be my guess why it is unstable with the added loss of the
>>splitter. Do you have an amplifier in the line? The amp may not be passing
>>the reverse signal well, or may not be amplifying it enough to make up for
>>losses due to splitters, etc. Most house type amplifiers do not amplify the
>>reverse signals.
>>
>
> Thanks, makes sense to me. Generally the upstream power is 55dBmV
> whether it's working or not. The log usually says that there was a T3
> timeout. Right now it's working OK - and I'm watching TV and writing
> this. It probably will quit in a little while.
> FWIW - maybe it is significant - I never had this problem until I
> replaced the RCA modem I was renting with this modem. There has been
> some cable work in our neighborhood recently.
> Comcast is coming out tomorrow - hopefully they can bring the levels
> up (and it won't cost me anything.)
If they can't get adequate signal with the splitter, then they need to
run you another line from the pole for the modem. That is how mine is
set up.
--
Ron Hunter rphunter@charter.net
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