[Asterisk-Users] HDLC bad FCS

[Rod Bacon]

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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