Re: Optoisolation for a modem

Doug,

Just a thought, have you had the phone company check it's surge protection device. They normally have one at the point where the
line meets the building...

As you have had so many hits, it could indicate the phone companies protection device is defective and you modem are taking the
hits.

Short of making your own, there is not much you can do, even then mother nature is hard to contain...

Sealed spark gaps are cheap and plentiful on the surplus market, they also have little effect on the line impedance.

Hans Wedemeyer

"Harrison, Doug" wrote:

> From: "Harrison, Doug" <dharrison@...>
>
> Does anyone know of a good way to protect a modem from spikes on the phone
> line? The Triplite surge protector works once, then the next jolt cooks the
> modem. We went through three modems and a fax machine last year. Bear in
> mind that we almost always unplug the modem after each use. It's those rare
> "almost's" that cause the problem.
>
> Our power is relatively surge free, probably because we have MOV's on three
> circuit panels and three wall outlets. Haven't blown one of these yet. The
> Triplite phone line protectors are just too expensive to replace as often as
> they go bad here. And they only get the first blast. The modem gets the
> rest.
>
> We live on a lake, so lightning is a problem. Any suggestions, such as
> optoisolation?
>
> Doug
>
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