Comcast / Motorola sb5100 cable modem dropping connection...

Comcast / Motorola sb5100 cable modem dropping connection...

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Subject Author Date
Comcast / Motorola sb5100 cable modem dropping connection... b4serenity 05-10-2006
Posted by on May 10, 2006, 3:39 pm
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First of all thanks so much for the help!!

I only get these values when I'm online by connecting to a Moto site I
saw in one of these posts. When my modem goes ofline I can't get these
numbers

Does it look like the modem is bad or is it saying that I'm getting a
fairly weak (barely strong enough) signal?


Thanks again!!


Pure Networks
Posted by on May 10, 2006, 3:48 pm
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OK, maybe we're on to something. I checked all the connections again
but this time ran the cable to the modem directly from the wall w/o
going through the splitter that they installed when they hooked up my
dvr box in the same room. My down power level went up 3 dbs to -7.
Seems a little low but not right on the bottom like it was. I'll try it
like this for awhile and see if I get dropped. Maybe the modem is
actually fine and they need to do something about the signal splitter.

On the signal splitter it says 2-way splitter 5-1000mhzand on each of
the two split connectors it says -3.5 db. Not sure what that means
exactly but is it a coincidence that my signal rose 3 db w/o it? Can I
just get a different value splitter?

Thanks agin!!

John


Posted by $Bill on May 10, 2006, 4:05 pm
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b4serenity@gmail.com wrote:

> OK, maybe we're on to something. I checked all the connections again
> but this time ran the cable to the modem directly from the wall w/o
> going through the splitter that they installed when they hooked up my
> dvr box in the same room. My down power level went up 3 dbs to -7.
> Seems a little low but not right on the bottom like it was. I'll try it
> like this for awhile and see if I get dropped. Maybe the modem is
> actually fine and they need to do something about the signal splitter.
>
> On the signal splitter it says 2-way splitter 5-1000mhzand on each of
> the two split connectors it says -3.5 db. Not sure what that means
> exactly but is it a coincidence that my signal rose 3 db w/o it? Can I
> just get a different value splitter?

You should have a splitter coming into the house and you want the
cable modem to go direct to that splitter using preferably RG6.

Run your TVs off the other legs of that splitter (you may even use
another splitter off one of the TV lines [I do] without any major
issues).

As far as the TV in the same room as the modem, I'd run another
RG6 line for it.

Basically you want nothing else on your modem leg.

Posted by George Berger on May 10, 2006, 4:19 pm
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>> You should have a splitter coming into the house and you want the
> cable modem to go direct to that splitter using preferably RG6.
>
> Run your TVs off the other legs of that splitter (you may even use
> another splitter off one of the TV lines [I do] without any major
> issues).
>
> As far as the TV in the same room as the modem, I'd run another
> RG6 line for it.
>
> Basically you want nothing else on your modem leg.

SBill - PMFJI. I have a similar setup, viz., incoming feed split into
two -3.5db channels.

Question: Can I install an amplifier on the non-modem channel to feed
three TVs in the house, or will that cause problems? I've wired the
modem line with a 50' length of RG6, but haven't actually hooked up my
SF5120 as yet and called Comcast to set up service.

TIA

George

--
I know that you believe that you understood what you think I said, but I am
not sure you realize that what you heard is not what I meant.
-- Robert McCloskey, State Department spokesman (attributed)

Posted by $Bill on May 10, 2006, 5:46 pm
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George Berger wrote:

> SBill - PMFJI. I have a similar setup, viz., incoming feed split into
> two -3.5db channels.
>
> Question: Can I install an amplifier on the non-modem channel to feed
> three TVs in the house, or will that cause problems? I've wired the
> modem line with a 50' length of RG6, but haven't actually hooked up my
> SF5120 as yet and called Comcast to set up service.

I don't see why not, but i'm running 3 TV legs off my 1-4 splitter and one
of the legs has a 1-8 splitter on it feeding 7 TVs/VCRs/PCs and I have no
problems with it. You may not need an amplifier.

You may want to check some of the websites out devoted to this sort of
thing - like broadbandreports.com etc.

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