Gordon Henderson wrote: > On Fri, 16 May 2008, Gordon Henderson wrote: > >> Have a problem with an ISDN30 line in the UK. > > So following up my own post.. I've not solved this issue, but I think I > know what causes it. > > This was my experiment to put 2 cards in one 1.3GHz system - a TDM400 with > 2 x FXO and 2 x FSX and a TE120P - E1 card. > > The PRI card loses interrupts, so I'm guessing it loses a frame of data > when it loses an interrupt, and eventually it gives up and does a reset. > The TDM card was rock solid. The system is using oslec too FWIW. > > When I unloaded the wctdm module the PRI performend flawlessly. > > So I'm suspecting the 1.3GHz processor and underlying IO is marginal for > this application. The Mobo doesn't have an APIC, just old PIC hardware, > although both cards were on separate IRQs - the TDM card had the higher > priority IRQ though - didn't have time to test it with the cards swapped > over, but loading the modules in a differnt order didn't make any > difference. Turning off the USB hardware didn't help either. > > The processor does seem to have a highish high-priority interrupt load (as > seen by top). I'll be trying a newer kernel when I get a chance though > (this is 2.6.18, compiled to match the motherboard exactly) > > Making calls through the TDM card just made it worse. > > However when it was working, it was working very well indeed, but the > occasional time when it dropped all calls (about once an hour) wasn't > good.
You might try turning off echo cancellation to see if your D-channel performance improves. That would be a good test to tell if you should look into perhaps getting either a faster CPU or a hardware echo canceller. It's possible that you may be saturating your poor 1.3 Ghz CPU by doing echo cancellation for too many channels on it. -- Matthew Fredrickson Software/Firmware Engineer Digium, Inc. _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
