Keep short-reach fiber links stable with a transceiver designed for 1000Base-SX connectivity over multimode fiber. The AddOn LACGSX-AO delivers Gigabit Ethernet performance up to 550 m through an LC interface and 850 nm optics, making it a practical fit for access-layer switches, aggregation uplinks, and optical network extensions where predictable compatibility matters. Built as a hot-swappable module, it supports fast replacement without taking the link offline longer than necessary. The transceiver is MSA-compliant, programmed, uniquely serialized, and tested for data traffic and application behavior to help ensure it initializes and performs as expected in Linksys-compatible environments. That level of validation matters when the cost of a failed optic is measured in downtime, not just hardware spend. For teams standardizing on qualified third-party optics, this module offers a controlled way to preserve performance while managing procurement costs. It is suited to data networking and optical network applications where 1 GbE MMF links need a verified, TAA-aligned option with the right reach, connector type, and operating profile.