A Brief Introduction of 1000BASE SX


A Brief Introduction of 1000BASE SX

1000BASE-SX is one of the Gigabit Ethernet standards standardized by IEEE 802.3z. 1000BASE-SX uses optical fiber for the communication cable and realizes a transmission speed of 1 Gbps. 1000BASE is a fusion of the technology cultivated in Ethernet so far and the technology migrated from the Fiber Channel. Fiber Channel is originally a serial interface that uses an optical fiber that connects server equipment and storage equipment at high speed, but the part related to data coding/decoding technology and media interface is the 1000BASE module, which uses an optical interface. It is a standard that uses optical fiber as a transmission medium, and there are two types, 1000BASE SX with a transmission distance of up to 550 m and 1000BASE LX with a transmission distance of up to 10 km, depending on the wavelength of light used and the type of optical fiber. So, here let’s get a brief knowledge about 1000base SX.

What Is 1000BASE-SX?

1000BASE-SX is a standard that uses a multi-mode fiber as a short wavelength laser (wavelength 850 nm) for signal transmission. The transmission distance is 550 m (depending on the core diameter of the fiber), and it is often used for backbones in data centers and connections between servers.

1000BASE-SX module
1000BASE-SX module


The structure of an optical fiber consists of two layers, a core through which light is transmitted and a part called a clad around it. There are two types, multimode optical fiber, and single-mode optical fiber, depending on the diameter of the core. Generally, multimode optical fiber has a core diameter of 50 μm and 62.5 μm, and single-mode optical fiber has a core diameter of 9 μm. 

Currently, single-mode optical fiber is the mainstream, but when it was technically difficult to manufacture single-mode optical fiber, multimode optical fiber was widely used. In a multimode optical fiber, since the refractive index of the core changes so as to increase toward the center, a plurality of modes occurs due to the difference in the refractive index. Therefore, it is not suitable for long-distance transmission.

It uses a multi-mode optical fiber and communicates with laser light with a wavelength of 850 nm. The maximum transmission distance is 550m. Because the equipment is inexpensive, it is used for backbone networks in buildings.

1000BASE-SX module
1000BASE-SX module

How It Works:

1000BASE-SX is a fiber-optic Gigabit Ethernet standard for activity over multimode fiber utilizing a close infrared (NIR) light frequency of 770 to 860 nanometers. The standard indicates a distance limit between 220 meters and 550 meters. By and by, with great quality filaments, optics, and terminations, the 1000BASE-SX will for the most part work over significantly longer distances.

This standard is extremely famous for intra-building joins in huge places of business, colocation offices, and transporter nonpartisan Internet trades. SFP 1000BASE-SX works at 850nm frequency and is just utilized for multimode optical fiber with an LC connector. The customary 50-micron multimode optical fiber of 1000BASE-SX SFP is 550 meters high and the 62.5 microns appropriated interface fiber-optic (FDDI) multimode optical fiber is up to 275 meters. Accept EX-SFP-1GE-SX for instance, this SX fiber handset upholds DOM work, and the most extreme distance of SX SFP is 550m.


1000BASE-SX SFP transceivers are compatible with the 1000BASE-SX standard. The medium of the 1000BASE-SX SFP is multimode fiber. Its operating wavelength is 770nm to 860nm. This type of SFP is used to connect devices both in the same cabinet and in different physical locations up to 1 km (3,280 feet) and is widely used in large buildings, colocation facilities, and carrier-neutral Internet exchanges.


Q. What Is 1000BASE-SX?

A. “S for Short wavelength” specifies the fibers and transmitters to use. The fiber should be of the multimode type and have a wavelength between 770 and 860 nm (usually referred to as 850 nanometers). Depending on the diameter of the fiber (50 or 62.5 microns) and the bandwidth per kilometer), the maximum distances can reach 275 to 550 meters.

Q. How Does 1000BASE-SX Work?

A. The optical fiber used by 1000BASE-SX has a wavelength of 850nm, which is separated into 62.5/125m multimode fiber and 50/125m multimode fiber. Among them, the greatest transmission distance utilizing 62.5/125m multimode fiber is 220m, and the most extreme transmission distance utilizing 50/125m multimode fiber is 500m. 1000BASE-SX takes on 8B/10B encoding strategy.

Q. What Is The Maximum Distance 1000Base-SX Cover?

A. The maximum distance supported varies from 220 to 550 meters, depending on the bandwidth and attenuation of the fiber optic cable used. The currently available standard 1000Base-SX NIC is full-duplex and contains LC fiber optic connectors. So 1000BASE-SX SFP supports a maximum length of up to 550m (depending on fiber type) on multimode fiber at Gigabit Ethernet.


1000BaseSX is most generally executed in a switch-switch arrangement. 1000Base-SX is very much popular for associating Ethernet switches, high-speed locations in various wiring storerooms or structures utilizing long cabling runs. QSFPTEK provides cost-effective, high-quality 1G SFP transceivers with a wide selection of 200+ brands compatible with 1000BASE-SX SFP modules. If you still have any questions, please contact sale@qsfptek.com.


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