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: A9K-2T20GE-E-WS/ A9K-8T/4-B-RF/ A9K-8T/4-B-WS/ A9K-8T/4-E-RF/ ASR1000-6TGE-RF