Splitting cable for internet access

Splitting cable for internet access
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Subject Author Date
Splitting cable for internet access Seguros Catatumbo 08-03-2006
Posted by Seguros Catatumbo on August 3, 2006, 8:30 pm
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Hi, i am new here and rather new to cable modems as well.

I live in Venezuela, and we get this old modem. It says "Webstar" and
has a "Scientific Atlanta" logo.

The cable from the street goes up to the building floor, and has a good
splitter with it. From that point just outside the apartment, the cable
goes to the room.

I went to some hardware store, and they sold me a cheap splitter.
Searching other boards i saw that i needed a 2-way splitter that
reached 1Ghz. This one says "Nippon America, 5-995Mhz".
Is the 5Mhz really critical? When i use the splitter the internet
connection doesn't even work and the tv quality degrades a lot.

What kind of specs should a splitter have? Is there a way i can measure
my signal quality? (Maybe some software that is compatible with my
phillips 7130 tv card?)

Thanks in advance.


Posted by Timothy Daniels on August 4, 2006, 1:16 am
"Seguros Catatumbo" wrote:
> The cable from the street goes up to the building floor, and has a good
> splitter with it. From that point just outside the apartment, the cable
> goes to the room.
>
> I went to some hardware store, and they sold me a cheap splitter.
> Searching other boards i saw that i needed a 2-way splitter that
> reached 1Ghz. This one says "Nippon America, 5-995Mhz".
> Is the 5Mhz really critical? When i use the splitter the internet
> connection doesn't even work and the tv quality degrades a lot.
>
> What kind of specs should a splitter have? Is there a way i can measure
> my signal quality? (Maybe some software that is compatible with my
> phillips 7130 tv card?)


In my Motorola SB5120 modem that connects to Comcast in
S. California, the downstream signal is around 739.8 MHz, and
the upstream signal is around 25.34 MHz. So a passband that
includes the low range enables the reverse signal going upstream.

The quality features in splitters includes a high return loss, low
intermodulation distortion, and good electrical sealing between
the 2 halves of the splitter case. This website will give you an idea
what good hardware is: http://www.cencom94.com/gpage.html

*TimDaniels*

Posted by Andrew Rossmann on August 4, 2006, 5:08 pm
seguroscatatumbo@gmail.com says...
> Hi, i am new here and rather new to cable modems as well.
>
> I live in Venezuela, and we get this old modem. It says "Webstar" and
> has a "Scientific Atlanta" logo.
>
> The cable from the street goes up to the building floor, and has a good
> splitter with it. From that point just outside the apartment, the cable
> goes to the room.
>
> I went to some hardware store, and they sold me a cheap splitter.
> Searching other boards i saw that i needed a 2-way splitter that
> reached 1Ghz. This one says "Nippon America, 5-995Mhz".
> Is the 5Mhz really critical? When i use the splitter the internet
> connection doesn't even work and the tv quality degrades a lot.
>
> What kind of specs should a splitter have? Is there a way i can measure
> my signal quality? (Maybe some software that is compatible with my
> phillips 7130 tv card?)

Does the modem work without the splitter? If so, check the signal
levels. Most will be accessible somewhere starting at
http://192.168.100.1/

If you are already marginal, the splitter will make it worse. You might
need an amplifier before the splitter. It's also possible the splitter
is cheap garbage with a fake label.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

Posted by Seguros Catatumbo on August 5, 2006, 1:07 pm

Andrew Rossmann wrote:
> seguroscatatumbo@gmail.com says...
> > Hi, i am new here and rather new to cable modems as well.
> >
> > I live in Venezuela, and we get this old modem. It says "Webstar" and
> > has a "Scientific Atlanta" logo.
> >
> > The cable from the street goes up to the building floor, and has a good
> > splitter with it. From that point just outside the apartment, the cable
> > goes to the room.
> >
> > I went to some hardware store, and they sold me a cheap splitter.
> > Searching other boards i saw that i needed a 2-way splitter that
> > reached 1Ghz. This one says "Nippon America, 5-995Mhz".
> > Is the 5Mhz really critical? When i use the splitter the internet
> > connection doesn't even work and the tv quality degrades a lot.
> >
> > What kind of specs should a splitter have? Is there a way i can measure
> > my signal quality? (Maybe some software that is compatible with my
> > phillips 7130 tv card?)
>
> Does the modem work without the splitter? If so, check the signal
> levels. Most will be accessible somewhere starting at
> http://192.168.100.1/
>
> If you are already marginal, the splitter will make it worse. You might
> need an amplifier before the splitter. It's also possible the splitter
> is cheap garbage with a fake label.
>
> --
> If there is a no_junk in my address, please REMOVE it before replying!
> All junk mail senders will be prosecuted to the fullest extent of the
> law!!
> http://home.att.net/~andyross

Cool, i knew of the non-routable ip of the cable modem but never
bothered to test if it had a layer 7 interface... So it appears my
cable provider disabled the signaling features, crap. Here is the only
info i can see:


         WebSTAR DPX100

Modem Serial Number
         0000000000000000

Cable Modem MAC Address
<hidden>

Hardware Version
         1.0

Software Version
         1.1.2 r1.1.3.1-0716 (dpx100-v112r1131-0716a.bin)

Receive Power Level
         10.25 dBmV

Transmit Power Level
         49.00 dBmV

Cable Modem Status
         operational

Of course the modem works fine without the splitter, just wanted to
know what features should the splitter have so i can view tv on my tv
tuner card and surf the net at the same time.

Thanks all


Posted by Ed Nielsen on August 5, 2006, 1:43 pm
Another very important spec, in addition to those I listed previously,
is blocking capacitors on ALL ports.


CIAO!

Ed N.

Seguros Catatumbo wrote:
> Andrew Rossmann wrote:
>> seguroscatatumbo@gmail.com says...
>>> Hi, i am new here and rather new to cable modems as well.
>>>
>>> I live in Venezuela, and we get this old modem. It says "Webstar" and
>>> has a "Scientific Atlanta" logo.
>>>
>>> The cable from the street goes up to the building floor, and has a good
>>> splitter with it. From that point just outside the apartment, the cable
>>> goes to the room.
>>>
>>> I went to some hardware store, and they sold me a cheap splitter.
>>> Searching other boards i saw that i needed a 2-way splitter that
>>> reached 1Ghz. This one says "Nippon America, 5-995Mhz".
>>> Is the 5Mhz really critical? When i use the splitter the internet
>>> connection doesn't even work and the tv quality degrades a lot.
>>>
>>> What kind of specs should a splitter have? Is there a way i can measure
>>> my signal quality? (Maybe some software that is compatible with my
>>> phillips 7130 tv card?)
>> Does the modem work without the splitter? If so, check the signal
>> levels. Most will be accessible somewhere starting at
>> http://192.168.100.1/
>>
>> If you are already marginal, the splitter will make it worse. You might
>> need an amplifier before the splitter. It's also possible the splitter
>> is cheap garbage with a fake label.
>>
>> --
>> If there is a no_junk in my address, please REMOVE it before replying!
>> All junk mail senders will be prosecuted to the fullest extent of the
>> law!!
>> http://home.att.net/~andyross
>
> Cool, i knew of the non-routable ip of the cable modem but never
> bothered to test if it had a layer 7 interface... So it appears my
> cable provider disabled the signaling features, crap. Here is the only
> info i can see:
>
>
>          WebSTAR DPX100
>
> Modem Serial Number
>          0000000000000000
>
> Cable Modem MAC Address
> <hidden>
>
> Hardware Version
>          1.0
>
> Software Version
>          1.1.2 r1.1.3.1-0716 (dpx100-v112r1131-0716a.bin)
>
> Receive Power Level
>          10.25 dBmV
>
> Transmit Power Level
>          49.00 dBmV
>
> Cable Modem Status
>          operational
>
> Of course the modem works fine without the splitter, just wanted to
> know what features should the splitter have so i can view tv on my tv
> tuner card and surf the net at the same time.
>
> Thanks all
>

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