Definition:

Gigabit Ethernet (GbE or 1 GigE) which also called 1000BASE SX is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second, as defined by the IEEE 802.3-2008 standard.1 GBE SFP SX fiber transceiver is 1.25G SFP, only use multimode fiber, corresponds to 802.3z standards.

Many customers may don’t know the meaning of 1 GBE SFP SX (1000BASE SX) fiber transceiver, here is the details.

1. Transmission media standard 

2. Used optical fiber type

3. Application

Transmission media standard

There are five physical layer standards for Gigabit Ethernet using optical fiber (1000BASE-X), twisted pair cable (1000BASE-T), or shielded balanced copper cable (1000BASE-CX).The IEEE 802.3z standard includes 1000BASE-SX for transmission over multi-mode fiber, 1000BASE-LX for transmission over single-mode fiber, and the nearly obsolete 1000BASE-CX for transmission over shielded balanced copper cabling.

Used optical fiber type

1 GBE SFP SX (1000BASE SX) fiber transceiver is used fiber: wavelength of 850nm,divided into 62.5 / 125μm multimode fiber, 50 / 125μm multimode fiber. maximum transmission distance of 62.5 / 125μm multimode fiber is 300m, maximum transmission distance of 50 / 125μm multimode fiber is 550 meters. 1 GBE SFP SX (1000BASE SX) uses 8B / 10B encoding.

Application

1. Gigabit Ethernet

2. Fiber Channel

3. Switch to Switch interface

4. Switched backplane applications

5. Router/Server interface

6. Other optical transmission systems

The Basics of 1000BASE-SX

1000BASE-SX is a fiber optic Gigabit Ethernet standard for operation over multi-mode fiber using a 770 to 860 nanometer, near infrared (NIR) light wavelength. The standard specifies a distance capability between 220 meters and 550 meters. In practice, with good quality fiber, optics, and terminations, 1000BASE-SX will usually work over significantly longer distances. This standard is highly popular for intra-building links in large office buildings, co-location facilities and carrier neutral internet exchanges. 1000BASE-SX SFP works at 850nm wavelength and used only for the purposed of the multimode optical fiber with an LC connector. 1000BASE-SX SFP traditional 50 microns of multimode optical fiber link is 550 meters high and 62.5 micron fiber distributed data interface (FDDI) multimode optical fiber is up to 220 meters. Take EX-SFP-1GE-SX as an example, its maximum distance is 550m with DOM support. The 1000Base-SX standard supports the multimode fiber distances shown in table.

Compatible 1 GBE SFP SX (1000BASE SX) part number for different brands

1 GBE SFP SX(1000BASE SX) multimode 850nm,550m,DDM
Cozlink	Cisco	Huawei	HP	Juniper	Brocade	Netgear
CZT-P851G-S5D	GLC-SX-MM	SFP-1.25G-SX	J4858C	EX-SFP-1GE-SX	E1MG-SX-OM	AGM731F

Cozlink is a manufacturer and supplier who offer 1 GBE SFP SX (1000BASE SX) transceivers with low price. At present, GPON SFP，SFP GEPON，SDH / SONET SFP， 3G video SFP，LTE / CPRI / OBSAI SFP，Copper SFP，Fiber Channel SFP，SFP SGMII and WDM BIDI SFP are on sale. Besides, Cozlink can offer cost-effective compatible SFP, such as Cisco, Huawei, HP, Juniper, NETGEAR, Finisar, Dell and other brands, all SFP transceivers will 100% test before delivery. We can also provide customized services of SFP modules and customers can customize LOGO.