Hi folks... I've got a CSU/DSU on a HiPer DSP that I *think* may be going bad...not really sure though. I'd like to be able to test it, but I'm not really sure how. I've got some equipment that can send BERT patterns at it, but I'm not sure how to set up the DSP to actually deal with that. I've gotten it into a line loopback, so I can bounce the pattern off the loopback, but that's not terribly helpful when you're trying to test the actual CSU/DSU. :/ I've found that the DSP can send, what appears to be a quasi-random signal, but I can't get it to sync up when sending it. My current setup to try to test this is the DSP card is connected via a "null-t1" cable to my other equipment (a Cisco 7507 with a multi-channel port adapter...has integrated CSU/DSU's and ability to run quite a few different BERT patterns...more capability in this area from 3Com would be *really* cool to have ;). I can get the T1's to sync up normally (non-BERT) by setting the clock source on the Cisco to internal (which is expected...*someone* has to generate clock...although it seems they'll coast for a while with both pulling it off the line without falling out of sync). I can also set up a loopback on the DSP, and run anything I want from the cisco and it works (BERT, true T1 signalling, etc.), but I can't reverse it. I have tried setting the cisco to have a loopback and run qrs from the DSP (available via the "cmd sendcode qrs" command on the console) but it never seems to want to sync up that way. I've tried all different combinations of clocking sources on the DSP and cisco with the DSP running qrs, but never can get it to be happy. Anyone have any knowledge about, or experience with, testing a DSP CSU/DSU for problems using BERT patterns and the like? -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.