Extend fiber reach with a compact SFP built for long-haul Gigabit Ethernet links. The AddOn ISFP-GIG-LH40-AO is Alcatel-Lucent compatible, TAA compliant, and hot-swappable, giving infrastructure teams a practical replacement path for production networks that need verified fit and sourcing alignment. This module uses an LC connector and supports 1000BASE-LH over fiber, making it suitable for longer-distance switch interconnects, campus links, and aggregation paths where short-reach optics are not enough. The design keeps deployment straightforward while preserving the density and serviceability expected from SFP-based infrastructure. For organizations standardizing on compatible optics rather than OEM-only parts, this transceiver helps control lifecycle cost without sacrificing operational clarity. It is a focused component: no excess features, just the compatibility, form factor, and fiber support needed to keep critical links active. The lifetime limited warranty adds another layer of confidence for teams managing spares and refresh cycles.