1.Ciena sfp dwdm optical fiber 2.Brand New and 100%genuine 3.Good Price and huge stock 4.Fast Delivery 5.1Year warranty ciena sfp dwdm sfp trcvr 1550nm 120km optical fiber module DescriptionOPT-25D-UL,2.7G DWDM, CH25, 28 DB AT OC48/STM16, 120KM DEFINITIONS DWDMDENSE WAVELENGTH DIVISION MULTIPLEXINGOC48OPTICAL CARRIER LEVEL 48 UP TO 2.5GBIT/S, SONET EQUIVALENT TO SDH STM-16STM16SYNCHRONOUS ...