[Asterisk-Users] How to fix a Blue Alarm?? Line Noise?

[Eric Wieling aka ManxPower]

Peter Svensson wrote:
> On Fri, 12 Aug 2005, Bruce Ferrell wrote:
> 
> 
>>Hardware, possible.  Unlikely to be cabling.  It's usually a timing setting.
> 
> 
> The blue alarm is really a very specific alarm condition normally. It 
> cannot quite see how it can be generated accidentally. Something along the 
> path from the TE110P transmitter to the decoder in the pbx generates a 
> AIS condition on the line. Theoretically a repeater or converter 
> withing the pbx could generate the AIS condition on the line.
> 
> Another option is that the pbx uses the term "blue alarm" for something 
> other than the normal AIS signal on a T1. 
> 
> Disturbances and frame slips would normally generate a local OOF 
> condition, eventually triggering a local red alarm and sending of yellow 
> alarm indication to the remote side.

We have had a Blue Alarm on a few of our T-1s.  We have only had this on 
new circuits and when we call the telco, they fix it.