Subj : Re: barbed wire telephony - USA standards
To   : paulie420
From : k9zw
Date : Fri Jun 10 2022 07:33:58

 pa>  hy> I mean, that's awesome and all, but if the phone system in USA is
 pa>  hy> anything like the UK phone system, then standard volage is +50volts a
 pa>  hy> ringer is 100V, so you wouldn't want to be touching it when a call wa
 pa>  hy> being established!

A good reference on the USA standards, including some of the cludges, is at:  

https://www.sandman.com/knowledgebase/ring-voltage-tech-bulletin

48vac 20hz, doubled when ringing, dropping to about 9vac 20hz at connect.

Article explains why EU/UK standard phones often won't ring on a US standard li

Doesn't get much into the harmonization where networks touch though.

--- Steve K9ZW via SPOT BBS 

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