Hello.
Just use a pair of hdsl Modems
And a router and you'll have
A data circuit on top of The POTS
Line.
73
Giorgio
Inviato da iPhone
Il giorno 31/mar/2012, alle ore 16:40, John Rabson <[email protected]> ha
scritto:
> I have received an enquiry from an Italian caver about using such a line to
> transmit speech, text and images of unspecified characteristics from one
> underground location to another. It is not clear whether the cable will be in
> a tunnel or in a cave.
>
> The total cable length is about 800 metres. For speech communications, his
> team intends to use field telephones (which are obviously going to work
> okay), but he would like to be able to transmit other things. I have sent him
> copies of a couple ofCREGJ articles on underground video, but before I can
> advise him further I need some appreciation of the attenuation versus
> frequency characteristics of the type of line he wishes to use.
>
> Can anyone advise, please?
>
> John F5VLF
>
>
>
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