The small form-factor pluggable (SFP) is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. It comes in optical and copper versions, which can be intermixed in combination of IEEE 802.3z standard compliant with such 1000BASE-T, 1000BASE-LX, 1000BASE-LX/LH interfaces on a port-by-port basis. These 1000BASE SFPs play a really important role in Gigabit Ethernet applications.

Gigabit Ethernet (GbE or 1 GigE) is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second (1,000,000,000 bits per second), as defined by the IEEE 802.3-2008 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 following passages will mainly describe three types of 1000BASE optical SFPs used in Gigabit Ethernet transmission: 1000BASE-SX SFP, 1000BASE-LX SFP and 1000BASE-LX/LH SFP.

1000BASE-SX SFP transceiver is compatible with the IEEE 802.3z 1000BASE-SX standard for operating over multi-mode fiber by using a 770 to 860 nanometer, near infrared (NIR) light wavelength. It only supports multi-mode fibers with link lengths ranging from 220 meters to 550 meters dependent on fiber diameter and bandwidth. A specific application in Gigabit Ethernet transmission is SFP-1G85-5M GLC-SX-MM 1000BASE-SX 850nm 550m SFP transceiver. It features with high performance and offers the same function with Cisco GLC-SX-MM and it is fully compatible with Cisco SFP devices. A figure about this product is below.

1000BASE-LX is a fiber optic Gigabit Ethernet standard specified in IEEE 802.3 Clause 38 by using a long wavelength laser (1,270–1,355 nm). Operation on both single-mode and multi-mode fibers is possible. It is specified to work over a distance of up to 5 kilometers over single-mode fibers and 550 meters over multi-mode fibers. Certainly, this 1000BASE-LX SFP can also provide high performance with an appropriate price.

The 1000BASE-LX/LH SFP, compatible with the IEEE 802.3z 1000BASE-LX standard, operates on standard single-mode fiber-optic and multi-mode fibers, with the link lengths up to 10 km on the former and 55o m on the latter. While talking about 1000BASE-LX/LH SFP transceiver, this NEW Cisco GLC-LH-SMD Compatible 1000BASE-LX/LH SFP 1310nm 10km EXT DDM Transceiver Module is more welcomed by consumers for Gigabit Ethernet and Fibre Channel Switch Infrastructure. Using this product, consumers can enjoy the same functions supplied by Cisco GLC-LH-SMD. The following picture is a 1000BASE-LX/LH SFP transceiver module.

Generally speaking, 1000BASE-SX, 1000BASE-LX, and 1000BASE-LX/LH SFPs are all suitable optical modules for Gigabit Ethernet transmission. Their specific applications are decided by fiber types and transmission distance. In Fiberstore, a series of above-mentioned 1000BASE optical SFPs can be found, including Cisco GLC-SX-MMD modules. Of course, other 1000BASE SFPs are also supplied in Fiberstore, like 1000BASE-T SFPs. You can visit Fiberstore to know more about 1000BASE SFP transceivers.

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