[SI-LIST] Re: flight time = propagation delay?
- From: "Moran, Brian P" <brian.p.moran@xxxxxxxxx>
- To: "'HouKevin@xxxxxxxxxx'" <HouKevin@xxxxxxxxxx>,"[SI-LIST]" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 15 Nov 2002 09:16:46 -0800
Kevin,
There is some confusion out there regarding the difference in prop delay and
flight time. Flight time has been defined in several books and papers but
I'm not sure eveyone speaks the same language. This is how understand it.
Propagation delay is the delay of the transmission line.
Flight time includes propagation delay plus an additional component which is
sometimes called delta Tco. This delta Tco component is the difference in
buffer Tco for the standard reference load vs the Tco for the actual load.
Depending on what the reference load is compared to the actual load, flight
time can be shorter or longer than propagation delay. We like to use 0pf
reference loads so that flight time is always greater than prop delay. You
measiure flight time by measuring delay to the receiver then subtracting the
buffer delay into the reference load.
Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@xxxxxxxxx
-----Original Message-----
From: HouKevin@xxxxxxxxxx [mailto:HouKevin@xxxxxxxxxx]
Sent: Friday, November 15, 2002 1:45 AM
To: [SI-LIST]
Subject: [SI-LIST] flight time = propagation delay?
HI gentlmen & ladies:
flight is equal to propagation delay?
regards
kevin
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