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13 Nov 2015

As we all know, 1000BASE-LX transceiver modules can only operate on single-mode fibers. Thus, if we use a Cisco SFP-GE-L 1000BASE-LX/LH SFP module in a multi-mode fiber system, it might pose a problem. When a single-mode signal is launched into a multi-mode fiber, a phenomenon known as differential mode delay (DMD) will appear. This effect can confuse the receiver and produce errors. To solve this problem, a mode conditioning patch cord is needed.

What Is Mode Conditioning Patch Cord?

A mode conditioning patch cord is a duplex multi-mode cord that has a small length of single-mode fiber at the start of the transmission length. The basic principle behind the cord is that you launch your laser into the small section of single-mode...

04 Nov 2015

1000BASE-LX/LH Optical Interface Specifications

The 1000BASE-LX, 1000BASE-LH and 1000BASE-LX/LH all refer to Gigabit Ethernet transmission. Among them, the 1000BASE-LX is a standard specified in IEEE 802.3 Clause 38 which uses a long wavelength laser, while the 1000BASE-LH and 1000BASE-LX/LH are just terms widely used by many vendors. Long Haul (LH) denotes longer distances while Long Wavelength (LX) denotes less energy which is obviously shorter distance. The 1000BASE-LX/LH SFP modules compatible with the IEEE 802.3z 1000BASE-LX standard can achieve a distance up to 10km over single mode fiber. Unlike 1000BASE-LX/LH SFP modules, 1000BASE-LH SFP modules operate at a distance up to 70km over single mode fiber. Besides 1000BASE-LX, other...

30 Oct 2015

SFP transceiver is a compact and hot-pluggable transceiver that plugs into a special port on a switch or other network devices. Cisco SFP transceiver is one of the most popular SFP transceivers for Gigabit Ethernet applications. When choosing SFP transceivers for specific applications in Gigabit Ethernet, we are usually confused with the fiber optic interfaces of them. This article will introduce the family products and the fiber optic interfaces of Cisco SFP transceiver for Gigabit Ethernet applications.


The Product Family of Cisco SFP Transceivers

The product family of Cisco SFP transceivers include the following types:

  • 1000BASE-T SFP for copper networks
  • 1000BASE-SX SFP for multimode fiber only