Howto on Cable Modem Connection

Howto on Cable Modem Connection

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Subject Author Date
Howto on Cable Modem Connection John Jones 02-10-2006
Posted by Quaoar on March 9, 2006, 5:52 pm
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John Jones wrote:
> wrote:
>
>> Access the cable modem statistics page at 192.168.100.1 and check signal
>> to noise ratios and signal levels. The cable modem faq at
>> www.dslreports.com will provide the basis for determining if there are
>> line quality issues from the signal levels.
>
> Finally had a chance Sunday to do this. Stats are:
>
> Downstream
> SNR: 36 dB
> Power Level: -1 dBmV
>
> Upstream
> Power Level: 56 dBmV
>
> According to the FAQ, only the Upstream Power Level number looks bad.
> Guess I'll start looking for the right kind of splitter to feed the
> cable modem, and do some rewiring.
> John Jones, Detroit

It is always best to split the line only once prior to the modem and the
installation techs know this. the 56 dbmv is certainly not good, shoot
for 35-40 dbmv range. If you are doing your own wiring, consult the faq
for coax specs. Radio Shack is *not* the best source. Buy the best
coax type you can afford, and know that the connectors and install
techniques have a significant influence on signal quality. IOW, you
might contract a professional installer.

Q

Pure Networks
Posted by Steve on February 12, 2006, 6:51 am
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I have a cable connection also and I also had a BEFW11S4 router. I switched
to a WRT54GS router. It made a difference.
Steve

>A friend of mine has Comcast Internet, and is experiencing numerous
> "stalling" occurrences during her Internet sessions. Her XP Pro PC is
> hardwired to a Linksys BEFW11S4 router, which also feeds a laptop and
> a TiVo wirelessly. Router is connected to a SurfBoard modem.
>
> I tried to trace the route of the incoming cable back to the entrance
> point on the house today (having some problems because the entire
> basement has a drop ceiling). It appears the incoming cable runs to a
> Regal DS4DGH10 splitter. From there, a lead goes to a Regal GRS3DGH
> 110db EMI Isolator, and the lead to the cable modem takes off from
> there.
>
> She called Comcast this week, and the tech who showed up said he
> couldn't find anything wrong (he didn't look at anything in the
> basement, though). The TiVo, which is using a DLink USB wireless
> adapter, was showing Poor (24%) to Marginal (28%) connectivity most of
> the time I was there, with an occasional jump to Fair (58%).
>
> I downloaded a firmware upgrade for the Linksys router, and the
> download speed started out at 113 kbps, and gradually went up, never
> breaking 200 kbps. Applied the upgrade, but no change. Noticed the
> Internet light was flashing constantly on the router, which looks odd
> to me (my Linksys WRT54G, on a DSL line, has a constant Internet
> light).
>
> Any suggestions as to what might be wrong gratefully appreciated.
> John Jones, Detroit



Posted by John Jones on February 13, 2006, 5:45 am
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wrote:

>I have a cable connection also and I also had a BEFW11S4 router. I switched
>to a WRT54GS router. It made a difference.

I happen to have a new WRT54G router laying around, so I may try
swapping it into her network if I can't find anything else wrong. I
still think her cable wiring isn't right, so I want to change that
first.
John Jones, Detroit

Posted by Quaoar on March 9, 2006, 5:57 pm
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John Jones wrote:
> wrote:
>
>> I have a cable connection also and I also had a BEFW11S4 router. I switched
>> to a WRT54GS router. It made a difference.
>
> I happen to have a new WRT54G router laying around, so I may try
> swapping it into her network if I can't find anything else wrong. I
> still think her cable wiring isn't right, so I want to change that
> first.
> John Jones, Detroit

I responded above, but you toggled a memory cell or two: you have 56
dBmv upstream at the modem. A typical double splitter is -3dBmv loss.
Unless you have a bunch of splitters in front of your modem, the 56dBmv
is from my experience as a customer indicative of a line drop issue that
only the ISP's techs can correct.

Posted by Dave on March 9, 2006, 10:47 pm
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I agree! The 56dBmv upstream sounds like a level issue between him and the
node. I had a 55dBmv for quite some time and experiences random
disconnects. It took several attempts to get Comcast to find a problem at
the node. I now have a 36dBmv upsteam, 8dBmv downstream and a 39dB SNR.
I'm very happy with them.



>
> I responded above, but you toggled a memory cell or two: you have 56 dBmv
> upstream at the modem. A typical double splitter is -3dBmv loss. Unless
> you have a bunch of splitters in front of your modem, the 56dBmv is from
> my experience as a customer indicative of a line drop issue that only the
> ISP's techs can correct.



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