Mr. Fancy Pants USR Courier over here! One isp I worked at took the couriers out of their cases and put the boards in custom racks with fans blowing over them and added custom power supplies. Those ATI things were a fire hazard. Violating warranties on USR was much more stable. This was before anyone could afford Ascend(hah!) gear with PRI cards. I was the least compentent sort of tag along to some really great technical minds at the time, but in a sense I think that just made me the luckiest. Racks and racks of blinkenlights in underground bunkers, it was unbelievable to see it all at the time. :)