Can anybody explain the difference between section 2.2 and 3.2 of BIRD 120.1? Both seem to be describing the high-level process for calculating a voltage-time waveform from AMI models, a channel, and a bit stream. Thanks. Greg Edlund Senior Engineer Signal Integrity and System Timing IBM Systems & Technology Group 3605 Hwy. 52 N Bldg 050-3 Rochester, MN 55901