Keep long-haul fiber links stable with a 1 Gb ZX SFP designed for single-mode infrastructure. This module supports 1000Base-ZX operation over LC duplex fiber at 1,550 nm, with a rated reach of up to 70 km. That makes it a strong fit for metro aggregation, campus interconnects, and other environments where distance and signal integrity matter. DOM support adds practical visibility into transceiver health, helping teams monitor optical performance before minor issues become outages. For infrastructure teams standardizing on Cisco-compatible optics, this module offers a straightforward way to extend network reach without changing the underlying switching platform. It is a focused choice for links that need dependable transport over long spans, not just basic short-range connectivity. Compared with lower-cost short-reach optics, this ZX module is built for the harder problem: maintaining usable signal over distance. That distinction matters when the cost of a failed link is measured in downtime, not just replacement parts.