Mô tả Cisco GLC-ZX-SM:

Module quang 1000BASE-ZX SFP for Long-Reach Single-Mode Fibers. The 1000BASE-ZX SFP operates on standard single-mode fiber-optic link spans of up to approximately 70 km in length. The SFP provides an optical link budget of 21 dB, but the precise link span length depends on multiple factors such as fiber quality, number of splices, and connectors.