Alcatel-Lucent 7750 Configuration Manual page 40

Port Types
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Page 40
need for the physical port MAC, PHY, cable and other MDA-specific components
producing a less costly and more reliable adapter.
Optical Transport Network (OTN) — Including OTU2, OTU2e, and OTU3. OTU2
encapsulates 10-Gigabit Ethernet WAN and adds FEC (Forward Error Correction).
OTU2e encapsulates 10-Gigabit Ethernet LAN and adds FEC (Forward Error Correction).
OTU3 encapsulated OC768 and adds FEC.
7750 SR Interface Configuration Guide