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iphone - will be here? »
« Anyone having a DSL issue?  

TakeTheFifth

join:2004-04-20
Anjou, QC

1 edit

Re: A wire is a wire is a wire

I would be more concerned about interference riding the power lines than the 60Hz signal itself: hi-frequency junk (from electric motors, arc welders, amateur radio, etc). If have seldom seen nice and clean sine wave house power; If you live near any kind of garage, industry, machine shop (or are on the same power grid), and you suspect your problems are related to power line interference, they would be the culprit. At any rate, keeping phone lines away from power lines is a good idea (and if you can avoid having them run parallel, even better).

Some other sources of RFI: »cable-dsl.home.att.net/#RFI

Phil
permalink · 2007-09-08 09:50:40 · Print · Reply to this

Bicephale

join:2005-09-24
·TekSavvy Solutions..

1 edit

Re: A wire is a wire is a wire

Hi Phil,

I'd like to use a more descriptive expression than
just the term "60 Hz noise", which is quite vague,
but my GNet only provides a simple diagnostic tool
through 'DMT' and my SpeedTouch even less.  In any
case, i did suspect there was a wider problem this
winter and i still do so the next step would be to
put the MoDem on battery since that's all i can do
about such external nuisance;  when it comes to AM
radio stations and storms i'm short of imagination
but it wouldn't matter with these numbers, though:

             Source:  GNet BB0060B
               Date:  2007-Sep-8
               Time:  11:27:52
       Bits-per-Bin:  13
      UpStream Bins:   6 to  31 inclusively
    DownStream Bins:  33 to 254 (idem)
     Tx Power Attm.:  -1 dB
        Coding Gain:   7 dB

            Up Time:  12:12:37 (43957 sec)
          Local CRC:   142/day (72/43957 sec)
         Remote CRC:    16/day (8/43957 sec)
          Local HEC:    90/day (46/43957 sec)
         Remote HEC:     4/day (2/43957 sec)
     Local Tx Power:  10.95 dB
    Remote Tx Power:  19.40 dB
  Local Line Atten.:  31.5  dB
 Remote Line Atten.:  29.0  dB
   Local SNR Margin:  18.5  dB
  Remote SNR Margin:   8.0  dB

Even a twelve hours record has little meaning here
and i don't believe this is the end of peak rushes
but that's nowhere near a thousand errors per day,
(around four thousand until recently to be exact)!



As i wrote, the wires got to go back into the wall
so there's no other way to manage with the limited
space than by shielding Bell's main while the rest
of the phone lines are moved by a few inches only.

Thanks for your link, i already feel apprehensive!

permalink · 2007-09-08 12:42:38 · Print · Reply to this
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