I think there are no universal definitions for flight time or for propagation delay. Anybody might see it differently than you do. I define them differently than others who replied. If somebody such as IEEE or JEDEC or ? has actual definitions, then we ought to use them. But old habits will be hard to break. My point is that one needs to define the terms when using them. Andy ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu