Cisco - CPAK transceiver module - 10 GigE - 10GBase-LR - MTP/MPO single-mode - up to 6.2 miles - 1310 nm - for P/N: A99-8X100GE-TR/ A9K-8X100GE-SE/ A9K-MPA-1X100GE/ NC6-20X100GE-L-C/ NC6-20X100GE-M-C