The 1000BASE-LH SFP for Both Multimode and Single-Mode Fibers. The 1000BASE-LH SFP, compatible with the IEEE 802.3z 1000BASE-LX standard, operates on standardsingle-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers. When used overlegacy multimode fiber type, the transmitter should be coupled through a mode conditioning patch cable.1300-nm wavelength, extended operating temperature range and DOM support, dual LC/PC connector. Description: 1000BASE-LH SFP transceiver module, MMF/SMF, 1310nm, DOM Brand Name Cisco Item model number GLC-LH-SMD= Form Factor Plug-in module Fiber Type MMF* Optical wave length 1310 nm Item Weight 0.32 ounces