The Usage of Mode Conditioning cable , if you want to apply Gigabit single-mode (LX) over an existing multi-mode fiber Optic Cable Plant.
Things to know when using mode conditioning cables to patch an existing multi-mode cable plant to your Gigabit Single-mode (LX) equipment.
Mode conditioning cable are normally used in pair. That means you need a MC cable at each end to connect the equipment to the cable plant. So then these cables are usually ordered in even numbers. The usual reason why someone may order one cable is for spare unit.
If your gigabit single-mode (LX) switch is equipped with SC or LC connectors, be sure to connect the yellow leg (Single-mode) of the cable to the transmit side, and the orange leg (multi-mode) to the receive side of the equipment. It is imperative that this configuration be maintained on both ends. The swap of transmit and receive can only be done at the cable plant side. (see image below)
Generally, Mode Conditioning patch cords are required for link distances greater than 984 feet (300 meters). We have heard some case stories where that distance has been lesser or greater. To our experience, the distance of 984 feet (300 meters) is just a benchmark. Your results may vary according to various different equipment and field conditions.
Some manufacturers of the newer "high end" multimode fibers claim that that their premium line cables will not require mode conditioning. Contact the manufacturer of your installed cable for the answer.
