StarTech.com Cisco GLC-ZX-SM-RGD Compatible SFP Module, 1000BASE-ZX, 1GbE SMF Optic Transceiver, LC Connector, 70km, 1550nm, DDM, Cisco ASR920, IE2000IE4000, Mini GBIC Transceiver Module - Lifetime Warranty (GLCZXSMRGDST) - SFP (mini-GBIC) transceiver module (equivalent to: Cisco GLC-ZX-SM-RGD) - 1GbE - 1000Base-ZX - LC single-mode - up to 70 km - 1550 nm