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× Questions about D110/210/410 T1/E1/J1 PRI Cards

Distorted audio, HDLC Abort, Bad FCS under high load

12 years 9 months ago #6580 by Jessie.liao
Please comment echocanceller in system.conf.
If possible,could you send your SSH to my email:[email protected]?
I'll check it for you.
And you can add my MSN/G-talk:[email protected] to contact with me.

12 years 9 months ago #6582 by AlexH
We can now replicate the issue using identical hardware and software config in our development environment, simulating call volume by looping test calls between two of the interfaces. This produces approximately 20 HDLC error messages in a 330 call test.

Have commented out the echocanceller line for the interface, and the test still produces these error messages.

However we have another live system which does not produces these errors. The key difference we can see so far is that the servers producing the error are IBM x3650 M2 79473AG, while the one that works is an older IBM x3650 7979B1A. I am now trying to see if these servers handle interrupts or PCI hardware differently.
12 years 9 months ago #6584 by Jessie.liao
It should be hardware compatibility issue with IBM x3650 M2.

12 years 9 months ago #6585 by lisa.gao
Please check if the interrupts and dahdi_test result are normal.
If possible, would you please exchange the cards on the two servers?

12 years 9 months ago #6589 by miaolin
could you try to swap to our new model D430P? whichi we are sure would not have such issue.
12 years 9 months ago #6590 by AlexH
dahdi_test result is normal (worst result 99.98%)

Interrupts look good to me, using APIC.

Have now updated the UEFI firmware for this server and still get the same HDLC errors on loopback testing.

Afraid I can not exchange cards between servers, the one where it is working OK is a live production server.

Would you have any idea why there might be a hardware compatibility issue with the IBM x3650 M2 servers? Is there anything further we could do to mitigate these effects?
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