[Asterisk-Users] TE110P flashing red/green when PRI connected ... continued

[Fredrik Lithén]

Perhaps everything isn't as spiffy as I thought

When running zttool the card still reports as internally clocked

Zaptel.conf:
# Global data
span=1,1,0,ccs,hdb3,crc4
bchan=1-15
dchan=16
bchan=17-31

loadzone=se
defaultzone=se

And as pointed out by Peter I do get a lot of D-channel warnings ...
Aug 9 16:21:25 NOTICE[1350]: PRI got event: HDLC Bad FCS (8) on Primary D-channel of span 1

And furthermore, now I've discovered that all channels seem to reboot from time to time
Aug 9 16:15:18 VERBOSE[1350]: -- B-channel 0/1 successfully restarted on span 1 ...


Could this be a HW problem with either the wiring, the PC or something else?


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Peter Svensson
Sent: den 9 augusti 2005 14:11
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] TE110P flashing red/green when PRI connected

On Tue, 9 Aug 2005, Andrew Kohlsmith wrote:

> On Tuesday 09 August 2005 04:32, Peter Svensson wrote:
> > A bitstream is present at the receiver, though it is unframed and 
> > invalid (i.e. the receiver is seeing a transmitter that does not 
> > quite know what to transmit). This is different from a red alarm 
> > where there is no bitstream at all.
> 
> I thought that red alarm was when it wasn't receiving a properly 
> framed signal, and it sent an unframed all-1s pattern to the far end.  
> Yellow alarm was when it was seeing an unframed all-1s pattern and was 
> then trying to send a properly framed signal to the far side?

I believe you are correct regarding the red alarm. Red alarm is declared when a frame loss has persisted for more than 2.5s. It is a local alarm. 
A framing error is a neccesary consequence of a LOS. :-)

Yellow alarm (Remote Alarm Indication) is sent when a frame error condition exists in the receiver. On a T1 it is sent in bit 2 of every frame (for D4) or through a pattern in ESF. For an E1 two separate errors indications are collectivly known as yellow alarm, loss of framing (sets the A bit) or loss of multiframeing (sets the Y bit).

Blue alarm (Alarm Indication Signal) is sent when the remote end does not want to communicate. It is sent as unframed 1.

> I seem to remember blue and yellow alarm being the same thing bu tit's 
> 6am here and the mind is very much foggy.  :-)

Blue alarm - the other end is either administrativly down or there is a disconnect between various layers somewhere along the receive path.

Peter


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