Re: Sealing current: was Telephone Ringers: how & why

Sep 04, 2007 1 Replies


>


>> snipped-for-privacy@apaflo.com (Floyd L. Davids>>
>>
>>
>>>The typical use we found for this was with a lot of the
>>>leased lines using those new fangled things called modems,
>>>instead of teletype loops (which had anything from 20ma
>>>to 60ma of current pulsing on them all the time).
>>
>>
>>Back before the "endless September" arrived, when Usenet was THE
>place to
>>get answers; an expert on sealing current enlighted us.....
>>
>>
>
>
>One thing is important to remember, 'sealing current' (which appears
>to be a new term for what was always known as 'wetting current' as far
>back as I can remember),

A.K.A. 'fritting current'. This is used in the railway industry to ensure good connections along the trainlines, and across the contacts of couplers.


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Greg Neff VP Engineering



*Microsym* Computers Inc. snipped-for-privacy@guesswhichwordgoeshere.com

That's a new one on me but it seems to be the same principle. Tyco do have it in their lexicon.

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and there are some technical publications on the subject

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it is also mentioned in this IEEE focument regarding railway communications.

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