http://tinyurl.com/kn4q63k
eNet Components 10GBASE-LR X2 Transceiver Module for SMF 1310nm SC Duplex Connector Cisco Compatible (X2-10GB-LR-ENC)
X2-10GB-LR-ENC X2 Transceiver Module
Form Factor: X2 MSA & ROHS Compliant
Connectivity Media: 9/10 �m Single-mode Fiber 1000Base-LX/LH
Distance Support: 6.21 Mile 9/10 �m Fiber
Data Transfer rate: 10 Gbps Gigabit Ethernet