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  • Re: barbed wire telephony - USA standards

    From k9zw@21:1/224 to paulie420 on Fri Jun 10 07:33:58 2022
    I mean, that's awesome and all, but if the phone system in USA is anything like the UK phone system, then standard volage is +50volts a ringer is 100V, so you wouldn't want to be touching it when a call wa 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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  • From poindexter FORTRAN@21:4/122 to k9zw on Fri Jun 10 08:12:00 2022
    k9zw wrote to paulie420 <=-

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

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

    MIKE SANDMAN!

    There's a name from my past. I was a telecom manager in a former life, his catalog was my version of thinkgeek.com.


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