Each front end at the ends

Need 2 ADCs and 3 DAC channels per end

Inputs via ADC:

PDH signal (used to modify laser frequency)
Green laser power monitor

Outputs via DAC:

PDH lock gain control output
PDH phase adjustment control
Thermal stabilization of the laser control (is controlled by PDH signal, need a filter bank in between) (need a multiplying constant which is linked to the constant controlling feedback to the coils (inversely))
Via the normal control path: ETM position control (feed into the coil outputs)

Vertex Front End

Need 7 ADCs and 4 DACs at the PSL

Inputs via ADC:

Phased locked loop signal from mixer. Need 1 per arm (2).
RFPD DC mon. Need 1 per arm (2).
Green Power mon. Need only 1.
Frequency discriminator signal. Need 1 per arm (2).

In digital land:

Take PLL signal and pass into a filter bank (with offset and filter). This is the fine control path.
Take frequency discriminator signal, pass into a filter bank. This is coarse control path.
Need a epics channel to be controlled manually or via script to set ratio of sums for coarse and fine control path for ETM (so this feeds into coils for the ETM, going to need RFM channels then)

Outputs via DAC:

Voltage Controlled Oscillator control. Need 1 per arm (2).
Voltage Controlled Oscillator offset control (needs a input from epics initially) Need 1 per arm (2).

this is a preliminary design for the electronics used in green locking

Somewhat related, but not a front end issue:

3 Ovens, 1 each end, 1 at PSL
Ovens talk to a GPIB interface for temperature readback and set point

Questions:

1) Whitening/Dewhiten signals from Green