[This message was posted by Rolf Andersson of Pantor Engineering 
<rolf.anders...@pantor.com> to the "FAST Protocol" discussion forum at 
http://fixprotocol.org/discuss/46. You can reply to it on-line at 
http://fixprotocol.org/discuss/read/586894b1 - PLEASE DO NOT REPLY BY MAIL.]

to put this in perspective, if you look at the propagation delay in a fiber 
connection, the light travels on the order of 100 meters in 480ns.

(speed of light in vacuum is roughly 30 meters / 100 ns, and speed is reduced 
by ~1/3 in fiber)

The standard deviation is obviously lower in this case ;)

/Rolf

> Here are some actual numbers from our system in production for Eurex
> and Xetra: The total time from the end of the incoming multicast
> packet to the start of the output packet: 480ns for the whole packet
> with a standard deviation of around 200ns.
> 
> This includes the multicast stack, the FAST decoding, the order-book
> processing and reconstruction, the output generation and the output
> multicast stack.
> 
> CME will be similar.
> 
> So yes, FAST is fast :)
> 
> Marc


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