We didn't have to change NIC's, but I can't say whether or not the DSP NIC's could cause the same problem. -----Original Message----- From: alex [mailto:alex@wanex.ge] Sent: Thursday, May 08, 2003 8:26 AM To: Discussion relating to the 3Com/US Robotics Total Control modem systems. Subject: Re: *MORE INFO* RE: [USR-TC] Urgent Problem - Any Ideas?MajorWTFhere. Joel, last question about it: do I have to change NICs too? Can DSP's NIC make this problems? Joel - Fox Computers wrote:

Yes, exactly - one bad DSP caused all of the DSP's to have problems, including all (or sometimes just random) B-channels going "local out of service", and a couple times a day the ARC would have an exception, dump all kinds of debug info to the console port and reboot itself. Replaced that one DSP and the whole thing is fine.

-----Original Message----- From: alex [mailto:alex@wanex.ge] Sent: Tuesday, May 06, 2003 8:43 AM To: Discussion relating to the 3Com/US Robotics Total Control modem systems. Subject: Re: *MORE INFO* RE: [USR-TC] Urgent Problem - Any Ideas?MajorWTFhere.

Does it mean that any bad card (DSP or other) can cause reboots of other cards in chassis? 3COM said that failure of one entity wont cause failure of any other but ...

Joel - Fox Computers wrote:

...

Final solution found -

For those of you who may have been following this and wondered "what the....", here it is.

The exceptions on the ARC causing it to reboot, AND all the B-channels going out of service, appear to have been caused entirely by a bad DSP in one of the slots.

We swapped the ARC and the NMC with different ones, slightly different code on the ARC even, and kept getting the same problem. Pulled all the DSP's except the first two, and the thing ran like a champ.

With utilization near 100% on those first two DSP's, we started plugging in the other DSP's. The second we plugged in the DSP in slot 8, all the users dropped off those first two cards and the B-channels went out of service. Permanently removed that DSP from slot 8 and replaced it with a spare, and the whole chassis has been running fine now for several days without a problem.

So it was a bad DSP all along.

- Joel

-----Original Message----- From: Paul Farber [mailto:farber@admin.f-tech.net] Sent: Monday, April 28, 2003 7:33 PM To: Discussion relating to the 3Com/US Robotics Total Control modem systems. Subject: RE: *MORE INFO* RE: [USR-TC] Urgent Problem - Any Ideas?MajorWTFhere.

Tell us what finally does fix it.

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