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[802.3ae] XAUI jitter tolerance test

I have a question on the jitter tolerance test signal for XAUI receiver.
In P802.3ae/D4.3, section Jitter Tolerance, on page 305, it is
said "Random jitter is calibrated using a high pass filter with a low
frequency corner of 20MHz and 20dB/decade roll off below this." Does
this mean the random jitter component of the jitter tolerance test
signal is mostly high frequency, above 20MHz? If so, since deterministic
jitter is also by nature high frequency, the amount of jitter a receiver
has to tolerate at, say, 2MHz, would be mostly the 0.1UIpp sinusoidal
jitter and not much more. Is this correct? Thanks for your attention.

Qicheng Yu