Acceptable signal strength?
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Posted by frank on July 7, 2008, 7:10 pm
Please log in for more thread options I seem to have periodic outages with Comcast Internet. I looked at the signal level while it was happening. Are the following vlaues alarming? SNR: 26.7dB Power level: 52.9dBmV Received signal strenghtl: -19.5 dBmV | |||||||||||||
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Posted by $Bill on July 7, 2008, 8:07 pm
Please log in for more thread options Low - typically in the 30-40 dB range (also depends on chipset QPSK/QAM) > Power level: 52.9dBmV
High - shouting a bit. > Received signal strenghtl: -19.5 dBmV
Low - should normally be in the -15 to +15 range (-12 to +12 better - 0 optimal) I'd have them make a call. | |||||||||||||
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Posted by Todd H. on July 8, 2008, 10:00 am
Please log in for more thread options
> Hi,
> > I seem to have periodic outages with Comcast Internet. I looked at the > signal level while it was happening. Are the following vlaues alarming? > > SNR: 26.7dB > Power level: 52.9dBmV > Received signal strenghtl: -19.5 dBmV Your upstream power level is pretty high. I generally start seeing flakey performance and packet loss issues when mine's been over 50. Mine's at 45dBmV right now. Your SNR seems a little low. Mine's at 34dB fwiw. Your received signal strength seems low as well. Mine's at -8dBmV right now. Try this at the DOS prompt or Terminal prompt: ping -t www.google.com Let it run for a minute or so and hit Ctrl-c. Look at the (% loss) number towards the end. I bet yours it pretty substantial. If you mention this packet loss number to the customer service agent sometimes it can help your case to get a technician out there to look at the lines. It can be as simple as a cable bent in too tight an angle in the wall or on the floor, or a connection that needed to be taken apart and put back together, or replacing a standard splitter with a directional coupler, or reterminating some cables with new ends, or several other things that might restore things to happiness. But overall, yeah, your signal is iffy enough and your results with it inconsistent enough that you shouldn't have to live with it. Make em roll a truck for ya. Best Regards, -- Todd H. http://www.toddh.net/ | |||||||||||||
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Posted by Todd H. on July 8, 2008, 10:01 am
Please log in for more thread options comphelp@toddh.net (Todd H.) writes:
>
>> Hi,
>> >> I seem to have periodic outages with Comcast Internet. I looked at the >> signal level while it was happening. Are the following vlaues alarming? >> >> SNR: 26.7dB >> Power level: 52.9dBmV >> Received signal strenghtl: -19.5 dBmV >
> > Your upstream power level is pretty high. I generally start seeing > flakey performance and packet loss issues when mine's been over 50. > Mine's at 45dBmV right now. > > Your SNR seems a little low. Mine's at 34dB fwiw. > > Your received signal strength seems low as well. Mine's at -8dBmV > right now. > > > Try this at the DOS prompt or Terminal prompt: > > ping -t www.google.com > > > Let it run for a minute or so and hit Ctrl-c. > > Look at the (% loss) number towards the end. I bet yours it pretty > substantial. Oh, I forgot to mention this loss number should be 0% ... maybe 1% tops. Any more than that, life really begins to suck. I'd suspect with your numbers you might be seeing a handful of percent loss, and I bet when it rains or when it's humid you might be having more problems than when it's dry out? If you mention this packet loss number to the customer > service agent sometimes it can help your case to get a technician out
> there to look at the lines. It can be as simple as a cable bent in > too tight an angle in the wall or on the floor, or a connection that > needed to be taken apart and put back together, or replacing a > standard splitter with a directional coupler, or reterminating some > cables with new ends, or several other things that might restore > things to happiness. > > But overall, yeah, your signal is iffy enough and your results with it > inconsistent enough that you shouldn't have to live with it. Make em > roll a truck for ya. > > > Best Regards, > -- > Todd H. > http://www.toddh.net/ -- Todd H. http://www.toddh.net/ | |||||||||||||
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Posted by frank on July 8, 2008, 10:17 am
Please log in for more thread options Hi,
Currently (with the same signal numbers) my Internet connection seems to work fine. I did the ping-> resulted in 0% errors.
I noticed a bit error number in my modem: it is 0.028%
> comphelp@toddh.net (Todd H.) writes:
> >>
>>> Hi,
>>> >>> I seem to have periodic outages with Comcast Internet. I looked at the >>> signal level while it was happening. Are the following vlaues alarming? >>> >>> SNR: 26.7dB >>> Power level: 52.9dBmV >>> Received signal strenghtl: -19.5 dBmV >>
>> >> Your upstream power level is pretty high. I generally start seeing >> flakey performance and packet loss issues when mine's been over 50. >> Mine's at 45dBmV right now. >> >> Your SNR seems a little low. Mine's at 34dB fwiw. >> >> Your received signal strength seems low as well. Mine's at -8dBmV >> right now. >> >> >> Try this at the DOS prompt or Terminal prompt: >> >> ping -t www.google.com >> >> >> Let it run for a minute or so and hit Ctrl-c. >> >> Look at the (% loss) number towards the end. I bet yours it pretty >> substantial. >
> Oh, I forgot to mention this loss number should be 0% ... maybe 1% > tops. Any more than that, life really begins to suck. I'd suspect > with your numbers you might be seeing a handful of percent loss, and I > bet when it rains or when it's humid you might be having more problems > than when it's dry out? > > > If you mention this packet loss number to the customer >> service agent sometimes it can help your case to get a technician out
>> there to look at the lines. It can be as simple as a cable bent in >> too tight an angle in the wall or on the floor, or a connection that >> needed to be taken apart and put back together, or replacing a >> standard splitter with a directional coupler, or reterminating some >> cables with new ends, or several other things that might restore >> things to happiness. >> >> But overall, yeah, your signal is iffy enough and your results with it >> inconsistent enough that you shouldn't have to live with it. Make em >> roll a truck for ya. >> >> >> Best Regards, >> -- >> Todd H. >> http://www.toddh.net/ >
> -- > Todd H. > http://www.toddh.net/ | |||||||||||||
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>
> I seem to have periodic outages with Comcast Internet. I looked at the
> signal level while it was happening. Are the following vlaues alarming?
>
> SNR: 26.7dB