Re: [PLUG] cable modem and a distribution amp

[gyoza@comcast.net]

I believe -6 dBmV is half a milivolt.  Do you still have the resistor 
thing in place?  The incoming level should be between +/-15 dBmV while 
avoiding extremes, from what I've read.

I read something like an /outgoing/ power level that is too high can 
cause the modem to shut down.  I don't fully understand the dynamics of 
that.  Overload protection?  I know mine is within tolerance so I didn't 
really care.  heh


James Barrett wrote:
> A few years back I was having some trouble with my cable internet 
> service. I called Comcast, and a tech came out who tested the line 
> coming in. He said that the signal was strong, and mentioned something 
> about strong signals being good for TV reception but bad for cable 
> modems. What he did was put a resistor or dampener of some sort on the 
> end of the coaxial cable as it entered the modem. It looked sort of 
> like an adapter, but did not change any connectors. It solved the 
> problem.
>
> Sometime between then and now we have gotten a different modem, this 
> time a motorola surfboard. I still get nearly flawless connection 
> uptime, and right now the downstream power level is -6 dBmV (a 
> negative six). The signal to noise ratio is 37dB.
>
> Also, while calling comcast for tech support is useless, they have 
> been useful for finding out if there is an outage in my area. Usually 
> it requires asking to speak to a supervisor.
>
> HTH
>
> gyoza@comcast.net wrote:
> > Hmm.  I read that digital signals could be lower than analog 
> > signals.  0 dBmV being ideal for analog TV.
> >
> > Do you know what the signal strength difference is now?  (My amp is 
> > +8 dB per outlet.)
> >
> > I had Internet trouble recently, before the amp was added.  I don't 
> > think the problem was on my end.  But, I do see a new problem with 
> > the amp in place.  There is some video noise; a faint vertical 
> > pattern at a slight angle creating a cross hatch on some channels.
> ___________________________________________________________________________ 
>
> Philadelphia Linux Users Group         --        
> http://www.phillylinux.org
> Announcements - 
> http://lists.phillylinux.org/mailman/listinfo/plug-announce
> General Discussion  --   
> http://lists.phillylinux.org/mailman/listinfo/plug
>
>
> ---
> avast! Antivirus: Inbound message clean.
> Virus Database (VPS): 000748-2, 06/09/2007
> Tested on: 6/11/2007 2:42:41 PM
> avast! - copyright (c) 1988-2007 ALWIL Software.
> http://www.avast.com
___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug