[Asterisk-Users] Problem connecting a TE410P to an E1/IP equipment

[Peter Svensson]

On Wed, 23 Feb 2005, Kevin P. Fleming wrote:

> Peter Svensson wrote:
> 
> > Yellow alarm is the same as "remote alarm" - i.e. the other side is saying 
> > that it cannot hear you. Given the Loss Of Framing on the other end this 
> > seems resonable.
> 
> Actually, "yellow alarm" is most frequently generated when the link 
> (physical layer) is up and running, but the circuit (logical layer) is 
> not "up" (administratively).

Yellow alarm means that the "Alarm Indication" bit is set in the received 
syncronization frame from the far end equipment. As far as I know (and can 
tell from Cisco etc) the AI is most often set on incoming red alarm, i.e. 
loss of signal.

> LOF usually generates "red alarm" in my experience if left uncorrected :-)

LOF would generate a local red alarm and a yellow alarm at the other end, 
if that path is working.

What the original poster is seeing could be as simple as one pair being 
bad. I think a slightly broken rx pair from the remote equipment to his 
Asterisk box would create this pattern of alarm. Of course, it could be a 
broken E1 card as well at either end.

I'd try placing a loopback plug at various places, facing either way, 
along the path between the two pieces of equipment.

Peter