Tele-Communication (Telecom) Terms Glossary and Dictionary
OC768: Optical Carrier 768
Optical Carrier 768 (OC768 or OC-768) is a fiber optic line with a SONET rate of 39,813.12 Mbit/s (payload: 38,486.016 Mbit/s; overhead: 1327.104 Mbit/s), or 768 times the basic SONET rate of 51.84 Mbit/s (OC-1). It's often referred to as "40 Gbit". OC-768 is equivalent to STS-768 (Electrical level) and STM-256 (SDH).