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12 Fiber SC APC Pigtail, 1m G.652.D Single Mode 
RJ45 RJ11 Network Cable Tester VC468 with Detachable Remote 
12 Fiber LC UPC Pigtail, 1m G.652.D Single Mode 
1.8m DVI-Iオス - DVI-Dオス および HD15 VGAオス ビデオ分配ケーブル 
SC UPC Fiber Optic Loopback Module, Duplex Singlemode 
モジュラー プラグ、24AWG ツイスト ペア固体またはより線ケーブルのための保護されたネットワーク コネクタ（50/Pack）を通る Cat6 RJ45 
Cat6a イーサネットバルクケーブル、305m、23AWG ソリッド純銅線、750MHz、シールド付 (S/FTP)、PVC CMR、リール付き (ブルー) 
1. Core Parameter Overview
| Connector | Shape | Ferrule Diameter | Locking Method | Port Density | Main Application |
|---|---|---|---|---|---|
| LC | Small square | 1.25mm | Snap latch | Highest | Data centers, optical modules, high-density cabling |
| SC | Large square | 2.5mm | Push-in lock | Medium | Home broadband, PON, ordinary LAN |
| ST | Round bayonet | 2.5mm | Twist bayonet | Low | Old campus networks, surveillance, legacy building wiring |
| FC | Round threaded | 2.5mm | Screw fastening | Lowest | ODF racks, base stations, precision instruments, long-distance trunk lines |
2. Detailed Introduction & Application
LC Connector (Small Square)
- Structure: Compact square design with spring latch, available in duplex integrated jumpers.
- Features: Half the size of SC, highest port density, easy plug-and-play, low insertion loss.
- Application:
- Data centers, rack switches, SFP/SFP+/QSFP optical modules.
- 10G/25G/100G high-speed fiber links.
- High-density patch panels and server rooms.
Its products mainly include：
SC Connector (Large Square)
- Structure: Square push-in design, locks directly after insertion, no rotation or screwing needed.
- Features: Cost-effective, durable, simple operation, low failure rate.
- Application:
- Home broadband, optical modem, operator fiber access.
- PON fiber, FTTH access, general enterprise LAN.
- Ordinary fiber transceivers and weak current cabinet wiring.
Its products mainly include：
ST Connector (Round Bayonet)
- Structure: Round shape, lock by rotating 90° after insertion.
- Features: Good tensile resistance, bulky and space-consuming, gradually phased out.
- Application:
- Legacy campus networks, old factories and building cabling.
- Security monitoring and industrial fiber points.
- Renovation of existing old equipment.
Its products mainly include：
FC Connector (Round Threaded)
- Structure: Round with threaded nut, fixed by screwing tightly.
- Features: Excellent vibration resistance, stable connection, good dustproof and anti-loosening performance; slow wiring and large size.
- Application:
- Telecom room ODF patch panels and backbone trunk transmission.
- Base stations, microwave communication and outdoor high-vibration environments.
- Fiber optic test instruments and precision communication devices.
Its products mainly include：
3. Key Differences Summary
- Ferrule: LC is 1.25mm; SC/ST/FC are all 2.5mm.
- Connection Method:
- LC / SC: Direct plug and play, fastest operation.
- ST: Twist to lock.
- FC: Screw tight, most stable but slowest.
- Density Ranking: LC > SC > ST > FC
- Vibration Resistance Ranking: FC > ST > SC > LC
4. Selection Guide
- Data center high-speed, optical module, high density → Choose LC
- Home broadband, optical modem, general office networking → Choose SC
- Legacy equipment, old campus surveillance → Choose ST
- Room patch panel, base station, precision testing, trunk line → Choose FC
Supplement: All four connectors have UPC (Blue) / APC (Green) end types, do not mix connections.
