-=PCTechTalk=- Re: Cable Modem - Again!

Note: As far as I know radio shack does NOT sell an amplifier suitable for 
cable modem use.
Motorola does sell a bi-directional cable modem/cable-tv amplifier which I have 
not tried yet.

F.Y.I. This address (192.168.100.1) is a web page generated by your modem not 
motorola's or anybody elses website.

You indicated they said there was a high noise level on your line, and the 
reading before was 37db, but after the 'repair' it is 38db, a 1 db improvement, 
this is not substantial, heck that could be normal deviation from reading to 
reading.

The power level change from 58dbm down to 45dbm is a substantial improvement, 
what this means is your modem doesn't have to 'yell' at them, it can talk in a 
normal level instead. Note: In most cases the modem talks to the cable 
companies hardware using a
frequency just below channel 2, some splitters not meant for cable modem back 
channel use, some splitters don't handle the 'down' channel frequency range 
either, in most cases the down channel is going to be on a very high frequency, 
probably higher than
all their TV channels. The internal modem stat's page (IP above) will indicate 
the down channel frequency used on your system.

-Jim-


Cajun wrote:
> 
> Here's today's update on my cable modem situation after another visit from
> Cox.  Some of this information could be useful to some of you.  I'm running
> a Motorola Surfboard 4100.  Last night the cable technicians told me on the
> phone that they could tell from their end that I had way too much "noise" on
> my line, that my modem could only take up to a certain level of "noise," and
> that my modem was maxed out with the noise level.  They said that this high
> volume of "noise" could cause my modem power light to go out or blink, which
> it was doing yesterday for the first time.  I asked questions and was told
> that this could be caused by a slice in the line somewhere, or too much
> interference from neighbors on my cable line.  Last night I had a connection
> according to my modem, but I could not surf, and could not send or receive
> email at all.  I was dead in the water with a modem showing that I had a
> connection.  They said the problem was NOT my modem.
> 
> As you may recall, a couple of weeks ago we replaced the 3-way splitter
> installed by Cox with an amplified splitter from Radio Shack due to poor
> quality on several cable channels on our two TV's.  The Cox technician who
> came out today told me that although that amplifier greatly improved the
> picture quality of my TV cable channels, it would also actually amplify
> "noise" to my modem, so my modem should not be on the amplifier.  He split
> the modem off and ran the two TV lines through the amplified splitter,
> leaving my modem on the regular splitter.  Then he went outside and checked
> the lines on my house and on the pole.  He found a cut in the cable line at
> the pole.  He also found something that was not weatherproofed and said that
> water had gotten in.
> 
> After doing all of this work, he came in and went to Motorola's Surfboard
> statistic site (also referred by someone in this group) at 192.168.100.1,
> SIGNAL page.  Prior to the work this page was showing a 37 dB Signal to
> Noise Ratio, and a Power Level of 58 dBm V.  After the work, this page was
> showing a 38 dB Signal to Noise Ratio, and a Power Level of 45 dBM V.  I was
> told that the normal Power Level Range is somewhere between 35-48, and 58
> was way too high.  I was also told that the higher the Signal to Noise Ratio
> number the better.
> 
> So far, all is going well.  Fingers crossed!
> 
> Cajun
> 
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