Cisco - XFP transceiver module - SONET/SDH/ 10 GigE/ POS - 10GBase-ZR - LC single-mode - up to 49.7 miles - OC-192/STM-64 - 1550 nm - for P/N: 76-ES+XT-4TG3C-RF/ A9K-SIP-700-RF/ ME-3600X-24CX-M-RF/ SPA-1X10GE-WLV2-RF