Network Tools & Testers
Cat5e Ethernet Cables
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OS2 Singlemode Simplex
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Cat6a Ethernet Bulk Cable, 305m, 23AWG Solid Pure Bare Copper Wire, 750MHz, Shielded (S/FTP), PVC CMR, with Reel (Blue) 
Mini Cat6 RJ45 (8P8C) Shielded Toolless Keystone Jack 
5M Self Adhesive Hook and Loop Tape Roll Cable Management Fastening Strap Reusable Cable Organizer 
12 Fiber LC APC Pigtail, 1m G.652.D Single Mode 
5m Coax High Resolution Monitor VGA Cable – HD15 M/M 
10PCS RJ45 Connector 8P8C Gold Plated Shielded Modular Plug for Cat5e Cat6 Ethernet Network Cable 
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.
