[Asterisk-Users] Is it mandatory to give power supply to TDM400P card

[Time Bandit]

> I can modprobe TDM400P card without feeding power
> supply , so what is the purpose of providing power
> supply in that card.
> Can any body tell me
It is needed if you have FXS ports on it, because the card will need
to provide ringing voltage to the phone.

hth