| ch.1 | feedback signal after calibration peak added |
| ch.2 | feedback signal before calibration peak added |
| ch.3 | feedback through LPF (for low frequency region) |
| ch.4 | RION accelerator |
| ch.5 | drift canceler |
| ch.6 | blank |
| ch.7 | blank |
| ch.8 | blank |
| ch.9 | feedback after calibration peak added (for differential) |
| ch.10 | feedback before calibration peak added (for differential) |
| ch.11 | feedback through LPF (for low frequency) (for differential) |
| ch.12 | RION accelerator (for differential) |
| ch.13 | per arm reflected light power |
| ch.14 | MC reflected light power |
| ch.15 | blank |
| ch.16 | blank |
| ch.17(D1) | IRIG-B(from SK), D2:1pps(from SK), D3:1pps(local oscillator),D4: |
| ch.17(D2) | 1pps(from SK) |
| ch.17(D3) | 1pps(local oscillator) |
| ch.17(D4) | 16 sec timing pulse (local oscillator) |
| ch.17(D5) | lock status of per arm |
| ch.17(D6) | lock status of inline arm |