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Maybe before we decide on an interface
we should understand what distance 10GBE
has to cover and what jitter spec the xcvr
needs to meet. Are we talking about a building
a campus or a metropolitan network.

I started from the SONET side. The FC
and 1GB serdes use a single ended interface
and a nice strong PECL serial input.
the FC jitter spec more relaxed than Sonet.
Sonet devices use LVDS interface 
I am not sure which is more suitable for 10GBE
From the circuit design point of view I prefer

Haim Shafir
e9 Inc.
PH 408-343-0192 cell 408-892-1838 fax 408-873-2642