9-pin "DE-9" Cable Connector
| Pin | Signal name | Comments |
| 1 | +OUT | Fibre channel output |
| 2 | +5V | Optional |
| 3 | Module Fault Detect | Optional |
| 4 | Reserved | |
| 5 | +IN | Fibre channel input |
| 6 | -OUT | Fibre channel output |
| 7 | Output Disable | Optional |
| 8 | GND | Optional, return for pin 2 |
| 9 | -IN | Fibre channel input |
Optional pins 2, 3, 7, and 8 are intended for use with an external optical converter. This is often called a Media Interface Assembly (MIA).
Fibre channel DE-9 connectors often have only the 4 required contacts installed. Note that they are the four outermost contacts. This is an easy way to tell a fibre channel cable from an RS-232 cable.
Read more about this topic: Fibre Channel Electrical Interface
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