The ProXtend compatible GLC-BX-D SFP transceiver provides a maximum 1.25Gb/s throughput up to 20km over single-mode fiber (SMF), using a wavelength of 1490Tx/1310Rx via an LC connector. The transceiver has been preprogramed, data traffic and application tested, guaranteeing that it is 100% compatible and will perform the same as the original Cisco equivalent.