Keep legacy optical infrastructure in service with a 155 Mbps SFP built for multimode fiber and LC connectivity. This module is suited to environments where older Fast Ethernet or 155-Mbps ATM links still carry production traffic and replacement optics must match existing port and fiber requirements. The 1310 nm wavelength supports established multimode deployments, while the SFP form factor helps simplify inventory and field replacement across compatible network equipment. For teams extending the life of installed infrastructure, this module provides a direct-fit option that avoids unnecessary platform changes and preserves operational continuity. When the network is not ready for a full refresh, the right transceiver can keep critical links available without overbuilding the solution.