[Asterisk-Users] HDLC bad FCS

[Carlos Alperin]

That has nothing to do with the fact that you 're going to check what is
going on on that line.

You're going to check BER (Bit Error Rate) to see if you have line problems.

When I asked you for location, I was asking if your Asterisk box was in your
Computer Room, away from your TELCO provider. If you have everything on the
same location, then much better. Now you mention a DMS-100, is that the
Siemens one? If that is the case, better because the line analyzer is a
function on that switch.

Carlos

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rod Bacon
Sent: Monday, July 04, 2005 8:10 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] HDLC bad FCS

I think I need some help here. I didn't understand much of what you just
said there.

I though HDLC was a Layer 2 protocol? How can it have a "location"? FCS is a
frame check sequence.. right? So I'm getting data out of sequence (or 
frames are missing from the sequence?)

My gear is in a data centre, with the DMS-100 switch in the next room. Does
this help?

What is BER?


Carlos Alperin wrote:
> I believe that you need to analyze the packets at your provider site. They
> should be able to do that. Is your HDLC located on your location or on
your
> provider. This test should be done where Asterisk is running, because is
> where the problem is reported.
> 
> Start to look for Line Analyzers for HDLC, in order to check BER.
> 
> If BER is high enough, then the problem is internal on your server.
> 
> Regards,
> 
> Carlos Alperin
> Senior System Engineer 
> Seneca Communications, LLC
> Calperin at senecacom.net 
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rod Bacon
> Sent: Monday, July 04, 2005 7:27 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] HDLC bad FCS
> 
> I have 2 servers, configured identically. Each has a TE405P and 2 PRIs.
One
> server was experiencing crackly audio on one circuit, accompanied by HDLC 
> bad FCS messages. The telco recabled and moved me to another port on the
> DMS-100. The audio is better, but there are still bad FCS problems on the 
> span. I have moved the PRI in question to the other server, and the
problem
> does indeed move with the circuit.
> 
> There are no zaptel timing/interrupt problems present on either server.
The
> fact that 3 PRIs are error free and that the problem moves with the 
> circuit tells me that there is still a problem on the circuit.
> 
> The telco believes that there is nothing more that they can do (provision
a
> complete new circuit?).
> 
> I don't get HDLC aborts, so the problem may not be _that_ serious. Does
> anyone have any comments? Would a newer (unstable) version of Zaptel
drivers
> 
> help? Would line-build-out parameter in zaptel.conf make any difference?
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