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(Borrowed from Linac Locking Review slide deck - see References section below)

As already captured in the Requirements section above, the goal is to:

1. Generate a 476MHz RF Reference phase-locked to the LCLS-II Master Oscillator.
2. Transmit this signal from Sector-2 (LCLS-II MO) to Sector-10 (LCLS-I MO).
3. Align triggers between SC and NC timing.
4. Marge NC event timing onto the SC event timing.

As of the date this documentation was produced, the work to meet the first three requirements is almost complete and is currently undergoing verification.  The fourth requirements has been deferred to be tackled at a later date.

References

Timing for LCLS

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