Fwd: [asterisk-ss7] libss7 link quality troubles

[Robert Kenton]

Matt,
     What would be if we have a lot of Bad FCS or Abort HDLC ? It means that
the message sent by the Telco are discarded ?

And, can it happen when the messages are sent from our server towards the
Telco, happen this kind of error and we are not seen ?

I have experienced with chan_ss7 that there are a lot of malformed messages
in the incoming and in the outgoing to Telco, so this cause the link goes
down because of too much bit error rate.



---------- Forwarded message ----------
From: Marcelo Pacheco <marcelo at falevoip.net>
Date: Nov 6, 2006 1:50 PM
Subject: Re: [asterisk-ss7] libss7 link quality troubles
To: asterisk-ss7 at lists.digium.com

Yeah, I have a script called reasterisk:

#!/bin/bash
export PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
asterisk -r -x "stop when convenient"
rmmod wct4xxp
rmmod zaptel
modprobe wct4xxp
ztcfg -v
nice --1 open -c 10 -- asterisk -vc

It takes care of everything.

I got chan_ss7 working ok, but with frequent CRC/frame too short errors.
I'm using a Version 9 TDM405P, I can't ship it back to USA as it's in
production for the other 2 spans.

Marcelo

> On Nov 5, 2006, at 9:04 PM, Marcelo Pacheco wrote:
>> Most IAM and RLC result in:
>> [Nov  6 00:59:10] DEBUG[21678]: chan_zap.c:8460 ss7_linkset: Overrun
>> detected!
>>
>>
>>
>> Using dchan instead of hardhdlc results in constant CRC, frame too
>> short
>> errors on the ss7 link.
>>
>>
>> Is the current trunk bad ? I noticed core set verbose and core set
>> debug
>> isn't working properly.
>>
>> Any sugestions ?
>
> I have noticed similar problems related to hardhdlc and ss7 links.  I
> think the problem has to do with the fact that running an SS7 link is a
> lot more intensive than running a normal PRI, so it may not have
> adequate performance in that mode to handle that type of link.
> However, you shouldn't have any trouble (other than an occasional HDLC
> blip) with running it in dchan mode.  If you are, maybe one of your
> sigchans is running in the old mode.  Did you re-run ztcfg and/or
> reload the driver before you retested?
>
> Matthew Fredrickson
>
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--
Atenciosamente

Marcelo Pacheco
Diretor de Tecnologia e Sistemas - FaleVOIP Telecom
Com: (27)2127-9791
Cel: (27)9945-3993
Fax: (27)2127-9799
E-mail: marcelo at falevoip.net
MSN: marcelo at falevoip.net / marcelo at macp.eti.br
Site: www.falevoip.net


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