[Asterisk-Users] Issues with ringing on FXS ports

[Andrew Kohlsmith]

On April 7, 2005 01:44 pm, Ian Pattison wrote:
> Ok... I've done a bit of emperical testing but don't really know what the
> results mean. I'm starting to think I need an oscilloscope to measure this
> properly. All I have is a DMM, I'm measuring on both the AC and DC
> scales...
>
>               AC Measurement            DC Measurement
> On-hook       107V                               49V
> Off-hook       11V                                6V
> Ring             drops to 44V                    0V
>
> Does this make any sense to anyone?

No.  You should have no appreciable AC in on or offhook conditions.  Ring is 
the only time you should have AC and it should be around 80VAC.  

The DC measurements look alright.

-A.