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You have to define jitter better to make any comparison.
I would guess that the BL spec is cycle-to-cycle jitter which is the difference in length of one period to the next. So, if one cycle (from one sample to the next) is 20.833010 uS and the next cycle is 20.833000 uS, then the cycle to cycle jitter is 10pS.
Accumulated jitter is measured from a theoretically perfect clock. So, if you add all the cycle to cycle jitter for a few thousand periods, you will get accumulated jitter. If you keep a running tab on this, you will see that it's sometimes the clock is fast and sometimes it is slow.
Sometimes this accumulated jitter is measured peak to peak and sometimes it is mesured as RMS. Usually specs will be RMS. There is no way that the Black Lion mod results in 7-10 pS RMS. If they can do that, they really should be building sattelite radio relays - they'd make a lot more money.
-tINY
BTW - there is 1000 pS in 1 nS
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