Cisco - SFP (mini-GBIC) transceiver module - ATM - fiber optic - LC single-mode - up to 1.2 miles - OC-3/STM-1 - 1310 nm - refurbished - for P/N: SPA-4XOC3-POS-V2/ SPA-4XOC3-POS-V2=/ SPA-4XOC3-POSV2-RF/ SPA-8XOC3-POS