How often do you guys see Event 6 and 8 on your PRI? (aka "HDLC Abort" and "HDLC Bad FCS") Is this normal? I would think not. bkw
I see event 6 on one of ours all the time. It seems to come along several times a minute sometimes. I have never known quite what it meant. It never seemed to affect operation, as the circuit works great and sounds fine. FWIW, it is a PRI circuit between * and a Merlin Magix, with * providing network side signalling. On Tue, 5 Oct 2004 15:38:12 -0500, Brian West <brian@bkw.org> wrote:> How often do you guys see Event 6 and 8 on your PRI? > (aka "HDLC Abort" and "HDLC Bad FCS") > > Is this normal? I would think not. > > bkw > > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
I've found in testing that events 6 and 8 seem to be related to high call setup load on the PRI. In a loop-back load test, I get lots of these when running more than 30 outbound channels looped to 30 inbound on the same box, in an IVR-only test with no transcoding. Doesn't seem to matter, in my testing, how powerful the processor is - they still occur at a wildly varying rate. These particular events, along with the more-common frame retransmission errors, do not seem to cause big problems by themselves. Regards Scott Stingel Scott M. Stingel President, Emerging Voice Technology, Inc. Palo Alto California & London England www.evtmedia.com -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Brian West Sent: Tuesday, October 05, 2004 1:38 PM To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: [Asterisk-Users] its all 6's and 8's? How often do you guys see Event 6 and 8 on your PRI? (aka "HDLC Abort" and "HDLC Bad FCS") Is this normal? I would think not. bkw _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
On Tue, 5 Oct 2004 15:38:12 -0500, Brian West <brian@bkw.org> wrote:> How often do you guys see Event 6 and 8 on your PRI? > (aka "HDLC Abort" and "HDLC Bad FCS") > > Is this normal? I would think not. >Hi Brian, seems to depend what sort of switch the Asterisk node is connected to and over what sort of connection. You will see occasional transmission hits if you are connected to a Nortel DMS when the REX (Routine EXercises) are running and the D channel is switched from X to Y (or the reverse) but that would account for a hit every 2/3 weeks depending on the size of the switch and the REX schedule (usually after 01:30 when everything is quiet). The same kind of effect can be observed on Marconi System X switches using SS7 signalling when change overs occurr, sometimes twice a day, not pleasant stuff to watch all the GLKs bounce... Apart from switch change overs the production systems in our customers show very few event 6/8 messages unless cabling is dodgy (one co-located server suffered this problem when the Telco had a poorly patched connection on the frame). Systems that have been running since the beginning of this year show less than 1/2 dozen events after the initial cabling has been proven. Something similar was noted with the new SS7 stack for Asterisk when the load was high and although the initial suspicion was related to interrupt priorities I believe that the solution was found in software. HTH Darren -- Darren Storer Comgate Telco>Internet<Broadcast