Walter and All, I am forwarding Vladimir's comments on BIRD 123.2.2 to this list for discussion. Please look at his comments which are in the attached Word document. Since Vladimir is also on this email list, please direct your answers, questions and comments to him. (I don't want to be the middle man in such conversations...). The general problem is ambiguity of given definitions when it comes to implementation in EDA tool. The Bird does not seem to be logically complete (does not cover all cases, such as Time domain and Statistical flow), or does not provide all necessary parameters affecting the results (such as either giving frequency content of Tx Gaussian jitter, or making it defined as white uncorrelated jitter, etc.) Thanks, Arpad ============================================================