gyoza on 11 Jun 2007 18:59:05 -0000


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Re: [PLUG] cable modem and a distribution amp


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.

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___________________________________________________________________________
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