I T1 coming into a 2501 router through a Adtran DSU. I am seeing a small number of CRC errors (9 errors 3 million input packets). How concerned should I be about this? I have recently replaced both the DSU and the cable running from the DSU to the ro...

I aplogize if this is not the right forum for this, but can anyone recommend a good reference/learing book on frame relay?Thanks