Displaying 1 result from an estimated 1 matches for "90volt".
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48volt
2005 Jun 08
1
Do I need a ring capacitor to use TDM400P cards in UK
Hello
I have played about with a TDM400 card and plugged in some standard analog phones. I am using the card in FXS mode - for analog extensions. I did notice that one of my phones did not ring and I wondered why. I later read in Paul Mahler's book VoIP Telephony with Asterisk that in his section on the TDM400 on page 127 he says "In the UK, you may need an adapter that provides a