The SFP (Small Form-Factor Pluggable) module is a compact, hot-swappable transceiver used for both telecommunication and data communications applications. It interfaces a network device mother board (for a switch, router, media converter, or similar device) to a fiber optic or co
Despite the push for higher speeds, 1G SFP modules remain essential in:
Enterprise & Campus Networks: Perfect for office connectivity and VoIP.
Security Systems: Ideal for long-distance video surveillance backhaul.
Cost Management: They offer a stable, economical way to maintain existing infrastructure without a full 10G/400G overhaul.
At HYTOPTODEVICE, we continue to manufacture high-quality 1G SFP transceivers to ensure our partners can achieve efficient operation while controlling budgets.
2.1000BASE-LX SFP vs. 1000BASE-SX SFP: Key Differences at a Glance
The main difference between 1G SFP SX and 1G SFP LX lies in the wavelength, fiber type, and transmission distance.
| Feature | 1000BASE-SX (Short Reach) | 1000BASE-LX (Long Reach) |
| Wavelength | 850 nm | 1310 nm |
| Fiber Type | Multimode Fiber (MMF) | Single-mode (SMF) / Multimode (MMF) |
| Typical Distance | Up to 550m | Up to 10/20km (SMF) / 550m (MMF) |
| Connector | LC Duplex | LC Duplex |
| Application | Intrabuilding / Short distance | Interbuilding / Campus / Long distance |
2.1.1000BASE-SX (SX = Short Wavelength)
The "S" stands for Short-haul. It uses 850nm lasers and works exclusively over multimode fiber. It is the most cost-effective solution for connecting switches within the same server room or across floors.
The "L" stands for Long-haul. It uses 1310nm lasers and is primarily designed for single-mode fiber (up to 10km). However, it is highly versatile as it can also run over multimode fiber using a mode-conditioning patch cord.
Choosing the right SFP module depends on your existing cabling and the scale of your project.
3.1.Check Your Cable Type: If you have OM1/OM2/OM3/OM4 (orange or aqua cables) already installed, SX is usually the default choice. If you have OS2 (yellow cables), you must use LX.
3.2.Confirm the Distance: * < 500 meters: SX is more economical;
> 550 meters: LX is mandatory to ensure signal integrity.
3.3.Future-Proofing: If you are building a new network across a large campus or factory area,office zone. HYTOPTODEVICE recommends deploying 1000BASE-LX with single-mode fiber, as it allows for much easier upgrades to higher speeds in the future.
A frequent query we receive at our factory is: "Can I plug an SX module at one end and an LX module at the other?"
The short answer is: No. Because they operate at different wavelengths (850nm vs 1310nm), they cannot "talk" to each other directly. However, you can use both types within the same network on different links. For example, use SX for floor-to-floor connections and LX for building-to-building links. Just ensure that each independent fiber link has matching transceivers at both ends.
While 1000BASE-T (RJ45 copper) is easy to deploy, HYTOPTODEVICE fiber solutions are superior when:
Distance exceeds 100m: Copper is limited to 100 meters. 1G SFP RJ45 transceiver is better choice.
EMI Resistance: Fiber is immune to electromagnetic interference, making it vital for industrial or high-voltage environments.
Space & Weight: Fiber optic cables are thinner and lighter, saving valuable space in high-density data centers.
As an original source factory (OEM/ODM/Wholesale) with 15+ years in the optical communication industry, HYTODEVICE TECHNOLOGY offers:
Comprehensive Product Line: From legacy 1G SFP to cutting-edge 800G OSFP transceivers and various AOC/DAC cables.
Strict Quality Control: Every fiber optical module undergoes 100% optical performance testing and compatibility in our production and test workshop.
Professional Solutions: We don't just sell products; we provide tailor-made solutions for your specific network architecture. we can make a reply within 24hours if you have any questions about optical communication and networks.
Ready to optimize your network? Whether you need high-volume 1G SFP LX/SX modules or a professional consultation on high-speed 800G connectivity, HYTOPTODEVICE is your trusted partner.
