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| Term | Meaning | Notes |
|---|---|---|
| SC | Subscriber / Standard Connector / Square Connector | |
| LC | Lucent Connector / Little Connector | |
| ST | Straight Terminus / Stick & Twist | |
| CS | Compact, twice ~twice as dense as LC | Some QSFP-* optics have multiple CS connectors for multiple transmitters/receivers |
| Singlemode | ||
| Multimode | ||
| Simplex | ||
| Duplex | ||
| UPC | Ultra Physical Contact/Connector | Connector and panel should be color coded blue. End of fiber core is concave |
| APC | Angle Physical Contact/Connector | Connector and panel should be color coded green. End of fiber core is diagonal |
| MU | Often referred to as "mini SC" | |
| MPO | Multi-fiber push on | See Optical: Multi-fiber Push On (MPO) |
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