Cisco Multirate - XFP transceiver module - SONET/SDH/ 10 GigE - 10GBase-LR/ 10GBase-LW - LC single-mode - up to 6.2 miles - OC-192/STM-64 - 1310 nm - for P/N: 4-10GBE-WL-XFP-RF/ A9K-2T20GE-B-RF/ A9K-8T-E=/ ME-3600X-24CX-M-RF/ SPA-1X10GE-WLV2-RF