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XFP MSA – SONET Jitter Issues<br />
Finisar<br />
■ Specifying Host and Module Properties to Meet SONET Jitter a Major Concern<br />
■ Largest Issue is Transmitter Jitter Generation:<br />
�� Main Approach: Host and Module Share Jitter Generation Requirements<br />
Host Meets Low Frequency Jitter Gen. Spec < 60 mUIp-p for 50 kHz – 4 MHz<br />
XFP Filters High Frequency Jitter, < 60 mUI Gen. from 50 kHz – 80 MHz<br />
Ability of Host to Meet Spec is Controversial<br />
�� Alternate Approach: Module May Use Clock Multipler Unit (CMU) on TX Path<br />
Replaces Host Jitter Gen. with Need for Tight Control of Clock Spectrum<br />
■ Jitter Peaking Probably not Hard to Meet But Hard to Measure.<br />
■ O<strong>the</strong>r Questions on Jitter Tolerance Complex When Divided between Host and Module<br />
Lew Aronson October 17, 2002
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