On Tue, 09 Nov 2004 07:41:36 +0800, Steve Underwood <[EMAIL PROTECTED]> wrote:
I have looked at many similar reports, and all but one turned out to be due to data slips. However, if you are sure this is only happening with one particular FAX machine your problem might be different. In t30.c uncomment the first line. Rebuild spandsp and try FAXing. You should get audio log files in /tmp. Send them to me, and I will investigate.
Steve:
It appears I shouldn't have spoken so soon, I apologize; that is, without a larger sample of faxes to observe. I was concerned about this particular machine because it fails on every page but in reviewing a sample of about 45 faxes this morning it appears that I am having trouble with other machines as well but not to the same extent I have with the Lexmark. The Lexmark fails on *every* page while some others fail only on one or two pages out of a fax, but still most others work fine.
For what its worth it also looks like the failures occur more frequently on faxes from longer distances away, I'm in Pennsylvania and the Lexmark is in Florida. It also appears that a machine in California is having an occasional problem with me too.
Before wasting any more of your time tracking down a problem that likely doesn't exist in the software I will approach it as a timing problem first.
On that tack, what should I look for as a potential source of a timing problem? As I indicated previously I see this problem even when I am connected directly to the PSTN and (believe) that I am using the PSTN as a clock source on the PRI.
Assuming that the clock from the telco is good should I start looking at the motherboard/system itself as a source of a timing problem? I have verified that the T1 card is on its own interrupt. Perhaps the motherboard just isn't cut out for handling this volume of interrupts?
Thank you for the help.
sl _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Do you have a telco test number in your area that gives you silence? If so, just call that number and listen carefully. If not, loop-back a call on your T-1.
If you hear an occasional click or pop then you're hearing a frame slip on the T-1. This is step one for diagnosing a fax problem.
I have a customer's P3TSSA MB (Pentium III) sitting here with a PCI SCSI controller. With a T100P, I've tried every combination of PCI card placement and irq assignment, and I still get clicking and popping on the T-1. Needless to say, fax transmission using spandsp is impossible.
I also have a GA-7N400 Pro2 MB (AMD XP 2800+) that I'm building for a customer. It has the same Adtran 750 on the same T100P card as above. When I call from phone to phone there is no clicking or popping on the line. Fax transmission using spandsp is beautiful on this system.
I would also recommend running top or system monitor while you're testing. If your processor ever pegs at 100% then your fax transmission will probably fail.
Mike
-- Michael Welter Introspect Telephony Corp. Denver, Colorado US +1.303.674.2575 [EMAIL PROTECTED] www.introspect.com _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
