[cisco-voip] Combining Power Fail Port and FXS Port

[Wes Sisk]

Hi Lawrence,

Is there some place I can read about the power-fail port and it's specs 
and function?

The FXS will continue to work properly so long as the REN for the port 
is not exceeded.  Basically this means the power-fail port would need a 
very high imput impedance (on the order of MegaOhms).  When you say 
power-fail do you mean power to the router will be off as well so the 
fxs port will not have power?  if the fxs still has power via the 
connected router, then when the power-fail shorts tip to ring, it will 
likely receive dialtone from the fxs port.

/Wes

Lawrence E. Bakst wrote:

>NM-HDA with CME 3.3.
>
>Is it safe to combine (pairs in parallel) a power-fail port and an 
>FXS port on the same NM-HDA card? This would let the analog phone 
>hooked up to the combined pairs function as a station set with CCE 
>via the FXS port until the power fails in which case the power fail 
>port will be directly connected to the FXO line, via a relay I 
>assume. Seems fine to me. Opinions?
>
>Best,
>
>leb
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