[Asterisk-Users] PRI Advice...

[Michael Crozier]

On Monday 11 April 2005 12:04 pm, Michael Crozier wrote:
> > The zaptel drivers are proving quite unstable with this combination.  If
> > I attempt to rmmod the zap drivers, the machine hangs and is unresponsive
> > to keyboard input, ping, or sysreq.  Additionally, I attempted to bypass
> > the Adtran unit using the TE110's to separate the data channels into an
> > HDLC interface.  I wasn't succesfull, as the HDLC interface triggered
> > similar "hanging" problems and I never succeeded in getting packets of
> > the data channels.
>
> For what it's worth, I changed to CVS HEAD and the instability problems
> modprobe'ing the modules seem solved.  ifconfig down'ing an HDLC interface
> still produce a stack trace and a kernel thread hang, but it is at least
> sysreq sync'able.
>
> My HDLC Abort problems are lessened, but not solved.  We haven't seen the
> problem in nearly five hours, reaching a new record.

The HDLC problems were NOT solved or lessened.  However, the telco (after 
insisting that they had throughly tested the lines) discovered that there was 
indeed a problem (unbalanced voltages in one of the pairs).  When they fixed 
this problem, my "HDLC Abort" problem went away completely.

The lesson I've learned: It's always the telco's fault :-)