Addon cisco glc-zx-sm-rgdpatible 1000base-zx sfp transceiver (smf, 1550nm, 7addon cisco glc-zx-sm-rgdpatible 1000base-zx sfp transceiver (smf, 1550nm, 70km, lc , rugged) Manufacturer : Add-onputer Peripherals, L UPC : 821455040850