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XENPAK MSA is
the next step beyond the XFP MSA. XENPAK and XFP
are very similar, but there are a few key differences. XENPAK uses
a larger connector, which results in lower density on the linecard,
but compensates for the power dissipation that is associated with long
runs and Gigabit Ethernet speeds. Also, XENPAK is a parallel interface(XAUI)
while the XFP is a serial interface.
XENPAK designates a .8mm(.0315"), 70 position (2x35), surface mount right-angle
connector, and Samtec’s MECT series complies with the XFP specifications:
MECT-135-01-M-D-RA1 mates
with XENPAK Transceivers and the corresponding cage is the SFPC/SFPK Series. 
For more information
on the XENPAK MSA, please visit:
www.schelto.com
See also:
SFP MSA and XFP
MSA
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