Cisco OC-12/STM-4 Pluggable long-reach (80 km) transceiver module, 1550-nm wavelength, LC connector. Cisco SFP-OC12-LR2 This Single-mode long range (LR-1)module used with the OC-12 ATM Line Card with Distance range 1550nm. Cabling distance miles (80 km), Connectors Multimode fiber-optic: LC-type connector Single-mode fiber-optic: LC-type connector.