FWLF1634RL19 Finisar TXRX DWDM 4GBPS APD SFP

GLC-ZX-SMD Overview

Cisco GLC-ZX-SMD is a 1000BASE-ZX SFP for Long-Reach Single-Mode Fiber. 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.When shorter distances of single-mode fiber (SMF) are used, it might be necessary to insert an inline optical attenuator in the link to avoid overloading the receiver. A 10-dB inline optical attenuator should be inserted between the fiber-optic cable plant and the receiving port on the SFP at each end of the link whenever the fiber-optic cable span loss is less than 8 dB.

GLC-ZX-SM-RGD Overview

The is a third-party compatible SFP for Cisco. This 1000BASE module will reach 550m / 1km and uses a wavelength of 850nm. All  are in-system tested in real Cisco routers and switches.