Trying to split a cable signal ...

Trying to split a cable signal ...
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Subject Author Date
Trying to split a cable signal ... NoelSemple1 05-19-2008
Posted by Robert Nichols on May 22, 2008, 10:46 am
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:
:But if they ask why the excessive upstream power is bothering me, is
:any problem other than the inability to split the signal which I can
:complain about? Maybe I should just pay another technician to check
:the wiring.

Just tell them, "Sometimes it works, sometimes it doesn't. And, even
when it's working, my upstream power level is running right at the
maximum my modem can put out."

--
Bob Nichols AT comcast.net I am "RNichols42"

NMFall 20%
Posted by Timothy Daniels on May 22, 2008, 7:42 pm
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> The numbers posted above are without the splitter. Also without
> the splitter, 500 pings to google.com produced 0% packet loss.
> With any of the three splitters I’ve tried, I get no connection at all
> and therefore cannot run tests.

Assuming that those really are splitters, suspicion turns to the
cable that runs between the wall and the splitter, or between the
splitter and the modem. Substitute other cables for those and
run the test again.

*TimDaniels*



Posted by Timothy Daniels on May 22, 2008, 7:37 pm
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"Todd H." wrote:
>
> That upstream power looks to be at the very edge of usability in my
> experience.


That generally means that the modem is transmitting at such a
high power because it can't "hear" the downstream packets well,
doesn't it? IOW, there's some kind of attenuation of the down-
stream signal. Is there a chance that the OP is using a tap, i.e.
a directional coupler, as a splitter and he has the modem on the
tapoff port of the coupler?

*TimDaniels*



Posted by Bill M. on May 22, 2008, 8:22 pm
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On Thu, 22 May 2008 16:37:23 -0700, "Timothy Daniels"

>"Todd H." wrote:
>>
>> That upstream power looks to be at the very edge of usability in my
>> experience.
>
>
> That generally means that the modem is transmitting at such a
>high power because it can't "hear" the downstream packets well,
>doesn't it? <snip>

I thought the CMTS sends instructions to the modem to command it to
increase or decrease its upstream power level on a continuous basis so
that the upstream signal strength *at the CMTS* is within spec. If so,
it would mean that upstream and downstream power levels are
independent of each other.

--
Bill

Posted by on May 22, 2008, 10:09 pm
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> On Thu, 22 May 2008 16:37:23 -0700, "Timothy Daniels"
>
> >"Todd H." wrote:
>
> >> That upstream power looks to be at the very edge of usability in my
> >> experience.
>
> > That generally means that the modem is transmitting at such a
> >high power because it can't "hear" the downstream packets well,
> >doesn't it? <snip>
>
> I thought the CMTS sends instructions to the modem to command it to
> increase or decrease its upstream power level on a continuous basis so
> that the upstream signal strength *at the CMTS* is within spec. If so,
> it would mean that upstream and downstream power levels are
> independent of each other.
>
> --
> Bill

Well the tech came and replaced all of the cables running from the
alleyway to the house, which he said were obsolete. Somehow, this cut
off the guilt-free free tv, so the splitter issue is moot. Thanks
anyway for all of your help.

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