Cisco Multirate - XFP transceiver module - SONET/SDH/ 10 GigE - 10GBase-ER/ 10GBase-EW - LC single-mode - up to 24.9 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