What are the fiber optic jumper interfaces?

1、 The most commonly used mainstream interface
1. SC square head (generous mouth)
Appearance: Square plug-in type, buckle press plug-in
Commonly known as: Big Square Head
Usage: Home broadband optical modem, PON fiber optic, most commonly used in computer room distribution frames
2. LC small square head
Appearance: Small square head, half smaller than SC, with buckle
Commonly known as: Small Square Head
Usage: Switches, servers, optical modules, high-density cabling in data centers
3. ST round head bayonet type
Appearance: Circular plug, fixed with rotating buckle
Commonly known as: bayonet round head
Usage: Old computer room equipment, monitoring, industrial wiring, now gradually phased out
4. FC round head threaded type
Appearance: Round, with nuts and threads for tightening and fixing
Commonly known as: threaded round head
Usage: Testing instrument, broadcasting and television, precision communication, ODF distribution frame
2、 Rarely seen special interfaces
MT-RJ: Dual core integrated square head, used in early network equipment, now rarely used
MU: Mini square head, exclusively for Japanese devices, with extremely low penetration rate
E2000: LC improved model with dust-proof flip cover, used in high-end telecommunications rooms
DIN: Old style German standard circular interface, basically eliminated
3、 Quick distinction mnemonic
Fangtou Da=SC (Home Light Cat)
Square Head Small=LC (Switch Optical Module)
Round head nut=FC
Round head buckle=ST