Small Form-factor Pluggable (SFP) LX and LH are two types of transceivers used in fiber optic networks. SFP LX is a type of transceiver that supports long-wavelength laser technology, while SFP LH is a type of transceiver that supports short-wavelength laser technology. Both types of transceivers are used to connect fiber optic cables to network devices, such as switches and routers. SFP LX is typically used for longer distances, while SFP LH is used for shorter distances. Both types of transceivers are hot-swappable, meaning they can be plugged in and out of a network device without having to power down the device. They are also compatible with a variety of fiber optic cables, including single-mode and multi-mode. SFP LX and LH transceivers are an essential part of any fiber optic network, providing reliable and secure connections.