Cisco GLC-ZX-SMD, 1000BASE-ZX SFP Transceiver Module, Usage Data Networking, Optical Network, Interfaces/Ports 1 x LC 1000Base-ZX Network, Optical Fiber, Network 1000Base-ZX, Compatibility Cisco ASR 9000 Series Aggregation Services Routers. CISCO GLC-ZX-SMD 1000base-zx Sfp Transceiver Module Smf 1550nm Dom.