I just noticed that I made a mistake in the number of outputs of the Whitining Filter in the mini-rack. The number of Whitining Filter outputs on the mini-rack is 8, not 4.
kTanaka-san just checked the empty input ports of ADC in IOO0, IOO1 rack.
The following are the empty input ports.

• IOO0 rack, ADC0: 8-19ch (FIG1)
• IOO0 rack, ADC1: 24-31ch(FIG2)
• IOO0 rack, ADC2: 4-11ch 20-27ch (FIG3, FIG4)
• IOO0 rack, ADC3: no the empty input port(FIG5)
• IOO1 rack: no the empty input port(FIG6)

For the mini-rack, I would like to use 4-11ch and 20-27ch in ADC2 and additionally 8-15ch in ADC0 and 24-31ch in ADC1.
I will check with others to confirm that we can use this port as an addition. Also, do additional cabling.

After this klog I found to need one more input port, the all required number of ports for WFSf3 is 10 ports. 
I checked the IOO rack availability today and there were 10 ports available in the IOO0 rack and 1 port available in IOO1.

The following is a summary of the different information when compared to ADC/DAC channel assignment.

• IOO0, ADC0, ch8-ch12: Cables unplugged. There is still a filter for Refcav monitor on the model. (FIG1, FIG2)
• IOO0, ADC1, ch20-ch23: "MCL DMD I&Q" cable is plugged in. No corresponding signal was found in k1IOO0.
• IOO1, ADC1, ch20-ch23: "MZM DC SERBO ADC" cable is plugged in. No corresponding signal was found in k1IOO0.

To reduce electrical noise at the ADC, I need to avoid cabling across the rack. Now I have the following as a plan for the ADC inputs for WFSf3.

1. Plug the ADC into the 10 available input ports in the IOO0 rack.
   → In that case, we need to consider whether to clean up or leave the Refcav monitor filters that remain in the model. I cannot decide now if Refcav will be reinstalled in KAGRA in the future.
2. Add a new ADC to the IOO1 rack to supplement the 8inputs. Also plug it into one empty input on IOO1. Also unplug one unused port on IOO1 and plug it in.
   →However, when cleaning up unused filters and unused signals in the ADC of the IOO1 rack, we need to confirm that we are not reading those signals in the Guardian. 
   The MZM, ISS, and ALS signals are coming to the ADC in the IOO1 rack. At the moment, there is a proposal to use the input port of the ADC used for MZM since MZM is unlikely to be used in the immediate future, and also a proposal to borrow the QPDB of ISS since it is not in use.

I discussed these issues with Yamamoto-san and Ikeda-san.
We have no idea if we will need MZM and Refcav in the future, so we think Plan 2 is appropriate.