[ Neven wrote ] 
> You are seing a spectrum of MLT3 signal, which is 100 
> Mbit coding. 

[ John wrote ] 
> Pardon my naivety, but how does '100 Mbit' relate to frequencies 
> of 30 and 60 kHz?  Is this 100 Mbit per week? (;-)

Could be plenty.  I'd guess is something to do with either jitter and/or 
PLL recovery.  That alone I've seen down in the Khz range.  And I've 
seen it do a crude type of FM modulation within a chip to show up as 
side bands like a picket fence all up and down the spectrum. 

Regards, Doug McKean 


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