The link quoted on the EclipseLink/Maven wiki ends on an Error 403 page on switch.ch. If you are redirected to a better mirror then that would already be the answer.
If not: where did the repository go to? Searching the net only reveals that EclipseLink/Maven hat a history of typos on there Wiki-Page. However all the corrected links I found end on error pages as well.
The only link I see is:
http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/rt/eclipselink/maven.repo
and it seems to works just fine, redirecting it to
http://www.gtlib.gatech.edu/pub/eclipse/rt/eclipselink/maven.repo/