[Asterisk-Users] Re: TDM card loses Dial tone

[Tilghman Lesher]

On Wednesday 24 March 2004 16:40, Steve Murphy wrote:
> I have been experiencing the same problem with my 4-port Digium FXS
> card. I see Ouch, reset... messages on the console. One of the
> lines, maybe 2, will either lose dial tone completely, or have tons
> of static on the line. On the latest event, today, I noted that
> even when the dialtone was gone, asterisk could still detect that I
> took the phone off-hook.
>
> To clear it up, either reboot, or, I find that bringing down
> asterisk, then rmmod the wcfxs, and then modprobing it back, and
> ztcfg, and restart asterisk, usually brings the lines back to life.
> Frequency: maybe 1 or 2 times per week at the worst, once every
> other week at the best.
>
> I have the newest 4 port card. Yes, it is plugged into the power
> supply. Yes, the TDM has IRQ #4, all to itself.
>
> What is going on? Is there any hardware config that NEVER has any
> problem?

Try replacing the power supply or adding a UPS to your configuration.
The problem is that the power is occasionally dropping to a point
where the TDM board attempts a reset.  These power dips can sometimes
leave the hardware in a strange state.

-Tilghman