[Asterisk-Users] zttool: BLU/RED Alarm

[Alexander Lopez]

>From : http://www.techfest.com/networking/wan/t1.htm

T1 has a number of other defined alarm and control signals. The alarm
signals have different color designations and are used to indicate
serious problems on the link. These alarm signals are defined as: 

Red Alarm 
This is a local equipment alarm. It indicates that the incoming signal
has been corrupted for a number of seconds. The red alarm shows up
visually on the equipment that detects the failure. This equipment will
then begin sending a yellow alarm as its outbound signal. 

Yellow Alarm 
The yellow alarm alerts the network that a failure has been detected.
The yellow alarm pattern has a number of different definitions. The most
common D4 definition is to set 1 bit of every channel to a ZERO. 

Blue Alarm 
A blue alarm indicates the total absence of incoming signal. This alarm
also serves to keep the circuit in synchronizations by sending
continuous transitions (an all 1's pattern).

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Eric
Wieling aka ManxPower
Sent: Tuesday, May 03, 2005 1:09 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] zttool: BLU/RED Alarm

Chris A. Icide wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> 
> Using zttool with a Sangoma A104 card, I am seeing a BLU/RED alarm on
> a 
> circuit.  What is the meaning/significance of the BLU alarm?  I've
> never 
> seen a blue alarm before.
> 
> Is this specific to the Sangoma card, or do Digium cards generate the
> BLU 
> alarm as well?

I've seen it on a Digium card.  Talked to my telco, they did something 
to make it go away.
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