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 Ed Nielsen on May 20, 2008, 12:02 pm
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Tim brings up a very good point about a diplexer. Make sure that the
splitter used reads 5-1000MHz and not 5-860 on one leg and 950-2000+ on
the other leg.

With just your cable modem connected, what are the signal levels
(downstream and upstream, as well as S/N) as found at
<http://192.168.100.1>?

Monster is getting to be sadly hilarious. Now, they are suing a
miniature golf course in Rancho Cordova along with the Rhode Island
woman who sells Monster Mini Golf franchises for trademark infringement.


CIAO!

Ed N.


Timothy Daniels wrote:
>> We live in Toronto and have Roger's cable internet and tv. Both the
>> cable modem and the tv work perfectly when connected directly to the
>> wall. However, when I introduce a splitter and attempt to use them
>> simultaneously, the tv continues to work but the modem doesn't.
>>
>> I've tried at least 5 different splitters, including a $50 monster
>> cable model, none works.
>>
>> [......]
>>
>> Is there any type of splitter or amplifier which would let us use the
>> net and the tv simultaneously without calling the provider and going
>> back to paying for both?
>
>
> A normal splitter should work. Is it possible that you used splitters
> made for satellite use? What is the passband for the splitters that you
> used? A normal splitter made for CATV and cable/internet would have
> a passband of 5MHz to 900MHz or 1,000MHz. BTW, anything made
> by Monster Cable is grossly overpriced and intended to suck money
> out of gullible people. A good splitter is cheap enough to be given away
> by the cable company. I once walked into the supply yard of the local
> cable company (now Time Warner) and asked for a splitter and offered
> to pay for it. A technician went to his truck and just gave me one and
> said to forget it.
>
> There is also the possibility that you need a filter for the TV. It keeps
> the electrical noise from the TV from getting into the cable infrastructure
> of the cable company. Some older TVs can also make enough noise to
> interfere with the upstream internet signals. These you *might* be able
> to buy at Radio Shack, but more likely you'd have to get one from your
> cable company.
>
> *TimDaniels*
>
>

NMFall 20%
Posted by on May 21, 2008, 6:15 pm
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> Tim brings up a very good point about a diplexer. Make sure that the
> splitter used reads 5-1000MHz and not 5-860 on one leg and 950-2000+ on
> the other leg.
>
> With just your cable modem connected, what are the signal levels
> (downstream and upstream, as well as S/N) as found at
> <http://192.168.100.1>?


Thanks Ed! Here are my signals:

Downstream         Value
Frequency        615000000 Hz
Signal To Noise Ratio        38.6 dB
Power Level        -1.0 dBmV
The Downstream Power Level reading is a snapshot taken at the time
this page was requested. Please Reload/Refresh this Page for a new
reading

Upstream         Value
Channel ID        4
Frequency        25296000 Hz
Power        55.2 dBmV

how does this look to you?

thanks again,
-Noel

Posted by $Bill on May 21, 2008, 7:44 pm
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NoelSemple1@gmail.com wrote:
>
> Thanks Ed! Here are my signals:
>
> Downstream         Value
> Frequency        615000000 Hz
> Signal To Noise Ratio        38.6 dB
> Power Level        -1.0 dBmV
> The Downstream Power Level reading is a snapshot taken at the time
> this page was requested. Please Reload/Refresh this Page for a new
> reading
>
> Upstream         Value
> Channel ID        4
> Frequency        25296000 Hz
> Power        55.2 dBmV
>
> how does this look to you?

Your Tx power is on the top edge of acceptable at 55.2, Rx is a bit
high, but well within bounds and your SNR is very high (which is good).

Is this with or without the splitter ? If it's without, you're gonna
have problems when you put it back in. Put it back in and post the new
numbers if so.

Posted by Todd H. on May 21, 2008, 9:28 pm
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NoelSemple1@gmail.com writes:

>> Tim brings up a very good point about a diplexer. Make sure that the
>> splitter used reads 5-1000MHz and not 5-860 on one leg and 950-2000+ on
>> the other leg.
>>
>> With just your cable modem connected, what are the signal levels
>> (downstream and upstream, as well as S/N) as found at
>> <http://192.168.100.1>?
>
>
> Thanks Ed! Here are my signals:
>
> Downstream         Value
> Frequency        615000000 Hz
> Signal To Noise Ratio        38.6 dB
> Power Level        -1.0 dBmV
> The Downstream Power Level reading is a snapshot taken at the time
> this page was requested. Please Reload/Refresh this Page for a new
> reading
>
> Upstream         Value
> Channel ID        4
> Frequency        25296000 Hz
> Power        55.2 dBmV
>
> how does this look to you?

That upstream power looks to be at the very edge of usability in my
experience.

If you ping -t google.com for about 30 seconds and hit ctrl-t what
sort of packetloss are you seeing?


--
Todd H.
http://www.toddh.net/

Posted by on May 21, 2008, 10:17 pm
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On May 21, 9:28 pm, comph...@toddh.net (Todd H.) wrote:
> NoelSemp...@gmail.com writes:
> >> Tim brings up a very good point about a diplexer. Make sure that the
> >> splitter used reads 5-1000MHz and not 5-860 on one leg and 950-2000+ on=

> >> the other leg.
>
> >> With just your cable modem connected, what are the signal levels
> >> (downstream and upstream, as well as S/N) as found at
> >> <http://192.168.100.1>?
>
> > Thanks Ed! Here are my signals:
>
> > Downstream Value
> > Frequency 615000000 Hz
> > Signal To Noise Ratio 38.6 dB
> > Power Level -1.0 dBmV
> > The Downstream Power Level reading is a snapshot taken at the time
> > this page was requested. Please Reload/Refresh this Page for a new
> > reading
>
> > Upstream Value
> > Channel ID 4
> > Frequency 25296000 Hz
> > Power 55.2 dBmV
>
> > how does this look to you?
>
> That upstream power looks to be at the very edge of usability in my
> experience.
>
> If you ping -t google.com for about 30 seconds and hit ctrl-t what
> sort of packetloss are you seeing?
>
> --
> Todd H.http://www.toddh.net/

Thanks again everyone for all of your helpful advice!

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=92ve tried, I get no connection at all and
therefore cannot run tests.

If Tim=92s analysis is correct, I guess I need a technician? (I=92m
certainly not knowledgeable enough to answer Tim=92s questions myself.)
I=92d love to call the provider and have them rewire it for free, but as
noted above I don=92t want my =93guilt-free free cable tv=94 axed.

Maybe I should hide the tv and just say that the signal is problematic
in that the upstream power is too high? Then, hopefully, the Rogers
tech will rewire and I will bring the tv back out from hiding and the
modem and tv will live happily ever after together?

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.

Once again, much obliged for all your assistance.

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