[Asterisk-Users] TDM400 - channel out to lunch?

[Rich Adamson]

> > For those of us that have had probems with the tdm dropping, it seems
> > stopping *, stop and restart zaptel, restart * fixes what seems to be
> > a software bug. No reboot necessary. If that doesn't fix the problem,
> > then you might have a defective module.
> 
> I found that I need to unload and reload the wcfxs module from the kernel and
> re-run ztcfg.  Perhaps the former is no necessary, but it's in my script now.
> 
> > There was an issue with the first tdm cards shipped (ver e/f) where the
> > first module slot had a problem. Those that received replacement cards
> > found an added jumper wire on them suggesting a printed circuit board
> > trace had been missed (or something like that).
> 
> I have been having trouble with E/Fs (the H seems to be more stable), but it's
> not just with the first module.  In my case it is the second one.  And I
> initially had trouble because the FXO was on socket 1.  Digium had me move it
> to socket 4 and that helped some.  But only for a time.

Depending on which distro your using, doing 'service zaptel stop' and
'service zaptel start' handles all of the required driver restarts.

Usually when my tdm fails, all four ports fail at the same time.