On Tuesday 19 February 2002 06:12, you wrote:

> If connecting an analog modem to a digital phone line fries the modem, I
> wonder what happens if one uses a UPS that has a modem connection.  Then
> the modem is connected to the phone one way and to the UPS the other way,
> and the other UPS connector goes to the wall jack.  Would that save the
> modem, maybe fry the UPS? Or would the UPS be built of tougher stuff?

I am not sure. But as I understand it, the frying is due to excessive current 
and UPS is ment to absorb excessive voltage. So one might fry and in so 
doing, act as a fuse to protect the other.

Here is a little thoery of mine. The digital is maybe the same envelope as 
the analog. But the analog is sinusoidal waveform while the digital is square 
wave. The duty-cycle of square wave allows way, way more current to pass in 
the same time frame?

It's a thoery...

Regards,

Gan

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