>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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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. _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users