[Asterisk-Users] Asterisk Maintenance

[Michael Welter]

Chris Glover wrote:
> On Wed, 8 Dec 2004, Michael Welter wrote:
> 
>> I went on a service call yesterday to find an asterisk system with a 
>> T100P card on a Qwest PRI and a TDM40B card connected to fax machines. 
>> The TDM40B LEDs were not lit, and the system did not respond to 
>> keyboard input. However, calls were being processed for the PRI and 
>> 7960 phones.
>>
>> I replaced the TDM40B card with a new one, and the system now seems to 
>> be ok. But I'm wondering, why would the LEDs go off?  Why would 
>> keyboard input fail?
>>
> 
> Hi,
> 
> Cant help with the TDM card, but I have seen PCs get affected by mains 
> bumps. I used to have a PC where the keyboard controller would crash but 
> I was still able to telnet into the PC and reset it.
> 
> Check the mains supply, there might be something with a big inductive 
> load, that causes some ripples that are ending up on the DC outputs of 
> your PCs PSU.
> 
> HTH
> 
> Chris
> 
This was a situation where I had to recover the root password, so I 
wasn't able to ssh into the box.  I had to power-down the box, recover 
the password, and then reboot.

Also, the box is on a UPS, so I'm assuming the AC power is generated 
from the battery and is a perfect sine wave.  But that begs the 
question:  does a UPS system connect the mains to the output, or is the 
input power used to charge the battery, and the battery used to generate 
the output power?



-- 
Michael Welter
Introspect Telephony Corp.
Denver, Colorado US
+1.303.674.2575
mike at introspect.com
www.introspect.com