The N457-001-50 Tripp Lite's 50/125 micron LC/ST male-to-female fiber adapter cable allows you to utilize older installed ST fiber cables when upgrading to newer switches using LC type SFP or GBIC transceivers. Simply plug the LC male end into the new switch, and plug your existing ST cables into the Female ST ends. No need to scrap your existing fiber cable plant with all new cables.