Fibre Channel Electrical Interface - 40-pin "SCA-2" Disk Connector

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

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