We are relocating our modems to a new telco provider's colocation space. We grabbed an old quad chassis for testing the new colo site before the move. The quads are running 6.1.6 code and the Dual PRI card is running the 3.1.5 code. The telco vendor is running Nortel DMS-100 switches. Most of our testing is working fine, but we are having problems with some callers who can connect fine to our old POP and not at all to the new POP. I have this connection problem myself when I test the new pop from my home using a USR 56K modem. I can connect to the new pop at v.34, but not at v.90. When I remove error correction on the modem and use Hyperterm, I do see a lot of line noise. I also had the telco terminate one of the PRI's we are testing in their Cisco NAS box, and I could connect fine into that box from my home at v.90 or v.34. This is really confusing me. I was wondering if the 6.1.86 quad modem code might help, but I can't access it from the total control site even though it has no new features, just bug fixes. (This annoys me since we paid 100K for the four chassis we still own). Anyway, I was wondering if anyone could help me. Obviously, I don't want to switch thousands of users to the new pop until I understand what is happening. If anyone from 3com is montioring the list anymore, maybe you will help with a MIME attachment..... TIA, Jim - 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.