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Thread: Vulnerability to lightning

  1. #1

    Default Vulnerability to lightning

    How vulnerable are ADSL devices to lightning? I don't know of any blown through the phone lines yet, while normal modems seem terribly vulnerable.

  2. #2

    Default

    I have had one blown a few months ago... luckily my adsl "modem" is seperate from my router so it only cost me R400 bucks to replace. I now have lightning protection on the line and power... a Belkin one (Incredible says they will replace any hardware damaged should it not work let;s see)

  3. #3
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    Default

    I have had 2 splitters die on me - despite using a telephone lightning protection kit and UPS provided telephone line protection on both instances.

    But each time the surge stopped at the splitter [destroyed the lightning protection kit and buggered up the UPS's telephone thing].
    I'm tempted to use only the splitter as the protection kit .

  4. #4

    Default

    Quote Originally Posted by stoke
    I have had 2 splitters die on me - despite using a telephone lightning protection kit and UPS provided telephone line protection on both instances.

    But each time the surge stopped at the splitter [destroyed the lightning protection kit and buggered up the UPS's telephone thing].
    I'm tempted to use only the splitter as the protection kit .
    I am not familiar with splitters ... how do they work?

  5. #5

    Default

    Quote Originally Posted by telkomsuig
    I am not familiar with splitters ... how do they work?
    South African splitters are nothing more than double addapters for a phone line.
    When they talk about splitters overseas though - they are generally refering to a double adapter with a filter already built into one of the sockets on the output side. Same as a SA splitter with a filter plugged into one of the double sockets
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  6. #6

    Default

    My guess is that ADSL devices are as vulnerable as (analogue) modems, since the line itself is what is vulnerable or not. Once the line picks up a surge, the other devices will die as quickly.

    I too have lost a router to a lightning strike, BTW.
    Think twice, speak once.
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  7. #7
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    Default

    My bad - I meant ADSL/POTS FILTER - not splitter - sorry.

  8. #8

    Default

    Quote Originally Posted by stoke
    My bad - I meant ADSL/POTS FILTER - not splitter - sorry.
    I'm open to corrections - but as i understand it the filter is a very basic low-pass filter. ADSL works at high frequencies and voice traffic happens at (relatively) low frequencies. The filter stops the high frequencies from getting into your phone equipment. The ADSL modem also can't handle the lower frequencies of voice but the filter circuitry is built into the modem due to the order in which the different technologies were developed. You may well be able to purchase phone instruments with built-in filters these days - the pots filter is really just a patch to allow the 2 technologies to work side by side.
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  9. #9
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    Quote Originally Posted by ambo
    The filter stops the high frequencies from getting into your phone equipment.
    I was under the impression that the adsl filter is actually mainly for stopping infra and ultra sonic frequencies that are picked up by the phone from interfering with the adsl. ADSL ignores the normal sonic frequencies that the human vocal cords push out but things like background noise and hanging up the phone can generate infra and ultra sonic frequencies that interfere with adsl. Humans shouldn't beable to hear the adsl frequencies at all (even without a filter).

  10. #10

    Default

    Quote Originally Posted by Gambit
    I was under the impression that the adsl filter is actually mainly for stopping infra and ultra sonic frequencies that are picked up by the phone from interfering with the adsl. ADSL ignores the normal sonic frequencies that the human vocal cords push out but things like background noise and hanging up the phone can generate infra and ultra sonic frequencies that interfere with adsl. Humans shouldn't beable to hear the adsl frequencies at all (even without a filter).
    I have super human ears without a filter I definatly hear crackles and squeeks....

  11. #11
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    Quote Originally Posted by telkomsuig
    I have super human ears without a filter I definatly hear crackles and squeeks....
    Yeah, thats why I purposely used the word shouldn't because people do say they can hear abnormalities on their lines. I don't know if thats to do with cheap substandard equipment (dslam ports or modems) or some people can just hear a higher frequency spectrum than most other people. Can you hear these abnormalities with a filter in place?

  12. #12

    Default

    Quote Originally Posted by Gambit
    Yeah, thats why I purposely used the word shouldn't because people do say they can hear abnormalities on their lines. I don't know if thats to do with cheap substandard equipment (dslam ports or modems) or some people can just hear a higher frequency spectrum than most other people. Can you hear these abnormalities with a filter in place?
    No but I moved recently and the squeeks without the filter was much worse on my previous line... maybe it depends on line quality too...

  13. #13

    Default

    i (telkom) have lost 3 cards at the exchange due to lightning, 2 times my telephone service was out and once my adsl

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