[asterisk-users] Sporadic yellow alarms in dahdi_tool output

[James zhu]

hi:please ask your provider to check the connection. yes, RAI means there is a problem with remote side. 

Best regards,
James.zhu
Doing asterisk/PRI/ss7/dahdi, linux, asterisk cards, gateway(fxs/fxo/pri<->SIP).
website: www.voipviews.com 


Date: Fri, 25 Nov 2011 18:48:33 +0530
From: ishwar at exotel.in
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Sporadic yellow alarms in dahdi_tool output

Hi all,
We have a telephony server in India which runs CentOS release 5.7 (Final) version with four-span Digium Card, one of which has an E1 PRI line terminating on the server.$ dahdi_hardware 
pci:0000:07:08.0     wct4xxp+     d161:1420 Wildcard TE420 (5th Gen)
Recently we've been observing the status of Span 1 as observed from dahdi_tool output flaps between yellow and green. This happens a couple of few a day. 
While the span state is yellow, I observed that the modules dahdi_echocan_mg2 and wct4xxp are not loaded. 
After running sudo modprobe wct4xxp; sudo modprobe dahdi_echocan_mg2, the span state changes to green. 
The dahdi documentation has the following to say on yellow alarms:
(RAI — Remote Alarm Indication)Your T1/E1 port will go into yellow alarm when it receives a signal from the remote switch that the port on that remote switch is in red alarm. This essentially means that the remote switch is not able to maintain sync with you, or is not receiving your transmission.

As a newbie to asterisk, pointers will be very helpful. Here are some more details on the installed versions of various packages/modules.

1. Linux Kernel Version : $ uname -aLinux 022.exotel.in 2.6.18-274.3.1.el5 #1 SMP Tue Sep 6 20:13:52 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux2. Dahdi verison: dahdi-linux-complete-2.5.0.1+2.5.0.1
3. Asterisk verison: asterisk-1.8.6.04. libpri version: libpri-1.4.12
Is this a configuration issue, package version issue or an operator issue? I'll be glad to share the necessary dahdi configuration files if needed.

Thanks in advance.
--Cheers,Ishwar.

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