Has anyone used a Bit Error Rate Tester (BERT) to generate serial traffic to a router? Ideally I would like to use the BERT to test across the serial link (422)to the router and then over to the 3750 switch and then back again to the BERT! Not sure if this is possible! Can a router be used as a Bit Error Rate Tester on a 422 serial line? Any information would be great.