CISCO - SFP (MINI-GBIC) TRANSCEIVER MODULE - 100MB LAN - 100BASE-ZX - LC SINGLE-MODE - UP TO 49.7 MILES - 1550 NM - FOR P/N: WS-X6148-FE-SFP, WS-X6148-FE-SFP=, WS-X6148-FE-SFP-RF