The (2x) Two GLC-SX-MMD Cisco Compatible 1000Base-SX EXT DDM Transciver in 850nm wavelength are high-quality SFP transceivers designed for use in enterprise networking and server setups. These transceivers are compatible with Cisco equipment and offer reliable data transmission at a speed of 1000Base-SX. With the model number GLC-SX-MMD, these transceivers provide a seamless and efficient networking solution for businesses needing high-speed connectivity.