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XAUI AC coupling

To all XAUI users vendors,
My appologies if this question has already been answered.
AC coupling is part of the XAUI specification but no minimum capacitor size has been included. At some point all XAUI users have to answer the question of what capacitor size to use so I propose that it is included in the specification. The format could be something like:
Maximum low frequency cut-off caused by AC coupling of XAUI data: ____ Hz.
Minimum recommended AC coupling capacitor size in XAUI channels: ____ Farads.
To fill in the blanks above requires some spectral information of the 8B10B data going over the XAUI link. Can anyone help here?
Paul Wilson
Nortel Networks