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System Architecture.
| Plug / Socket 1 | Plug / Socket 2 | Description | Notes |
| PL10 | PL9 | SDSU Power Supply Cable | Linear power supplies are used. This means that the length of this cable is critical to correct SDSU operation. If you change the length of the cable or the size of the conductors, re-adjust the supplies. |
| PL7 | SK2 | SDSU Clock Cable | Updated version 4.0 is integral to SDSU controller |
| PL6 | SK5 | SDSU Pre-amp Cable | Updated version 4.0 is integral to SDSU controller |
| SK8 | SK3/SK24 | SDSU Telemetry Cable | Updated version 4.0 is integral to SDSU controller |
| SK11/PL12 | SK4 | Mechanism Drive Cable | There are two cables made up: 1 short set for Cass focus, 1 long set for NAOMI focus. |
| PL16 | SK15 | Mechanism Power Control | |
| SK17 | PL14 | Mechanism Drive Status | |
| PL18 | SK13 | Mechanism Control | |
| SK21 | PL22 | Closed Cycle Cooler Drive |
| Description | Notes |
| Helium Compressor | |
| IRLabs SDSU Array Controller | There is 1 complete spare. Check the timing and utility board software versions before using. |
| IRLabs SDSU Power Supply | There is 1 complete and adjusted spare. Always use the same length power supply cable. |
| INGRID Mechanism Power Amplifiers | There are 2 spare amplifier cards available. Check jumper settings before use. |
| INGRID Pre-amplifier | There is 1 spare, fully populated board. |
| INGRID Cryostat | |
| Vacuum Pressure Sensor | |
| VME Mechanism Control Crate | There is a complete set of spare boards available. Currently on loan to the IAC. Contact Mary Baretto. |
| Closed Cycle Cooler | |