[Asterisk-Users] TDM card periodic buzz

[Trent Tuggle]

On Apr 13, 2005, at 5:01 PM, Andrew Kohlsmith wrote:
> On April 13, 2005 03:42 pm, Trent Tuggle wrote:
>> The symptom is a loud, brief buzz, almost exactly every 6 seconds, on
>> the dot.  It is only audible to remote parties, when I use an analog
>> phone connected to my Digium TDM card.  All other audio through my
>> Asterisk box is fine, including SIP phones, music on hold, voicemail,
>> etc.  But when the TDM400P is bridged to the PSTN through my IAX2
>> provider, I get this repeating buzz!
>
> With it occurring, log in and type zttest and let it run for a minute 
> and tell
> us the accuracy min/max/avg.

Opened pseudo zap interface, measuring accuracy...
100.000000% 100.000000% 99.987793% 100.000000% 99.987793% 100.000000% 
100.000000%
99.987793% 100.000000% 100.000000% 99.987793% 100.000000% 99.987793% 
100.000000% 100.000000%
100.000000% 100.000000% 99.987793% 100.000000% 100.000000% 100.000000% 
100.000000% 99.987793%
100.000000% 100.000000% 100.000000% 100.000000% 99.987793% 100.000000% 
100.000000% 100.000000%
100.000000% 100.000000% 100.000000% 100.000000% 100.000000% 100.000000% 
99.987793% 100.000000%
100.000000% 100.000000% 100.000000% 99.987793% 100.000000% 100.000000% 
100.000000% 100.000000%
99.987793% 100.000000% 100.000000% 100.000000% 100.000000% 99.987793% 
100.000000% 100.000000%
100.000000% 100.000000% 99.987793% 100.000000% 100.000000% 100.000000% 
100.000000% 100.000000%
99.987793% 100.000000% 100.000000% 100.000000% 99.987793% 100.000000% 
99.987793% 100.000000%
100.000000% 99.987793% 99.987793% 100.000000% 99.987793% 100.000000% 
99.987793% 100.000000%
100.000000% 100.000000% 100.000000% 99.987793% 100.000000% 100.000000% 
100.000000% 100.000000%
99.987793% 100.000000% 100.000000% 100.000000% 100.000000% 100.000000% 
100.000000% 100.000000%
100.000000% 100.000000% 99.987793% 100.000000% 100.000000% 100.000000% 
100.000000% 99.987793%
100.000000% 100.000000% 100.000000% 100.000000% 100.000000% 100.000000%
--- Results after 109 passes ---
Best: 100.000000 -- Worst: 99.987793

What exactly does zttest test?