I read the comment underneath the Carentan-UO1 demo, that the jump could only be done with a nade in regular CoD. But it's deffenately possible without the nade. Take a look at the demo and see for yourself.
It's one of the hardest jumps out there (Took me at least 100 tries for this demo

) and I'm almost possitive that it can only be done with maxfps set to 333, but give it a try.
http://forums.filefront.com/attachment. ... ntid=25536