on 1/18/01 4:15 PM, Marcus Wigan at [EMAIL PROTECTED] wrote:
>
>> Again, what cause for concern? Just how high of a voltage are they calling
>> a safety concern?
>
> mains voltage at 240Volts
>
>> And exactly where do they think this voltage will come
>> from?
>
>
> Cross over on the circuit boards: there are many (not including Duo I might
> add) that still do not meet the long standing flashover protection in the
> tests.
>
Had a bro-in-law who worked telephone stuff (including putting in whole
telephone exchanges) when he was in Germany in the US Army. Then he worked
for a phone company here in the States for many years. Heard ALL sorts of
problems, but NEVER this 'flashover' thing.
>
> As a matter of record, Flashover from mains tracks on circuit boards to
> close to modem lines and transformers/ inductors have been the the main
> causes of failure in the published test reports.Modems are not the only
> device involved, ANY device that is to be connected to the PSTN system has
> always been subject to these tests.They are not very demanding for
> appropriately designed components.
Again, with an external modem, the power brick is designed to handle the
mains power and bring it down to the 12v DC or whatever the modem runs on,
and the mains power won't come thru the serial cable, since the computer has
a power supply designed for that country as well. And with an internal
modem, well, it's getting the power from the computer that has a power
supply designed for that country. It's even MORE ridiculous for laptops,
which are designed for the eventuality of traveling internationally. The
bottom line is that it appears that many folks worldwide are being sold a
bill of goods by someone. I certainly believe that there's a body of tests
that purport to show this problem exists, but as I've just shown, it
certainly would appear that these tests must be conducted under conditions
which are impossible to achieve in real-life and are therefore invalid.
>
>> this seems more like a case of a state-run monopoly
>
> Perhaps this might be the case in your country of residence, but in
> Victoria Australia the power industry is completely privatised and the
> testing is done by a different organisation completely.
I'm in the US, so we don't have the problem here. But the state-run
monopoly I was referring to was the PTT (Telco) one. If the telco in OZ is
private, then congrats... but AFAIK, it's all state-run in some fashion or
another in Europe/Japan.
>
> Overall, using the Duo UNconnected to the mains cannot cause any problems -
> these notes were to explain long standing general standards applicable to
> devices connected to the PSTN network in a number of 240V countries, as
> requested.
>
Thanks for the info. Sorry to go on about this and I should probably shut
up, but logical inconsistencies really get under my skin, and this seems
like a doozy! Cheers.
- Eric.
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