40-pin "SCA-2" Disk Connector
Although SCA-2 is the official name for this connector, it is often called SCA-40 to distinguish it by its pin count from other similar connectors.
| Pin | Signal name | Comments |
| 1 | -EN Bypass Port 1 | Output driven high when port 1 is operating correctly |
| 2 | +12V | |
| 3 | +12V | |
| 4 | +12V | |
| 5 | -Parallel ESI | Input to allow ESI operation using the SELx pins |
| 6 | -Drive Present | |
| 7 | ACTLED | Output to drive the activity LED cathode |
| 8 | Power Control | |
| 9 | START1 | Input to control spin-up behavior (see the Disk options section) |
| 10 | START2 | Input to control spin-up behavior (see the Disk options section) |
| 11 | -EN Bypass Port 2 | Output driven high when port 2 is operating correctly |
| 12 | SEL6 | Device ID bit 6 / ESI write clock |
| 13 | SEL5 | Device ID bit 5 / ESI read clock |
| 14 | SEL4 | Device ID bit 4 / ESI acknowledge clock |
| 15 | SEL3 | Device ID bit 3 / ESI bit 3 |
| 16 | FLTLED | Output to drive the fault LED cathode |
| 17 | DEVCTRL2 | Input to control interface speed (see the Disk options section) |
| 18 | DEVCTRL1 | Input to control interface speed (see the Disk options section) |
| 19 | +5V | |
| 20 | +5V | |
| 21 | +12V Charge | |
| 22 | GND (12V) | |
| 23 | GND (12V) | |
| 24 | +IN1 | Fibre channel input |
| 25 | -IN1 | Fibre channel input |
| 26 | GND (12V) | |
| 27 | +IN2 | Fibre channel input |
| 28 | -IN2 | Fibre channel input |
| 29 | GND (12V) | |
| 30 | +OUT1 | Fibre channel output |
| 31 | -OUT1 | Fibre channel output |
| 32 | GND (5V) | |
| 33 | +OUT2 | Fibre channel output |
| 34 | -OUT2 | Fibre channel output |
| 35 | GND (5V) | |
| 36 | SEL2 | Device ID bit 2 / ESI bit 2 |
| 37 | SEL1 | Device ID bit 1 / ESI bit 1 |
| 38 | SEL0 | Device ID bit 0 / ESI bit 0 |
| 39 | DEVCTRL0 | Input to control interface speed (see the Disk options section) |
| 40 | +5V CHARGE |
Read more about this topic: Fibre Channel Electrical Interface
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