Forum: Athelstan BBS

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

--- Mystic BBS v1.12 A48 2022/02/11 (Linux/64)
* Origin: SPOT BBS / k9zw (21:1/224)