Tele-Communication (Telecom) Terms Glossary and Dictionary
OC1: Optical Carrier One
Optical Carrier One (OC1 or OC-1) is a SONET line with a transmission speed of 51.84 Mbit/s (payload: 50.112 Mbit/s; overhead: 1.728 Mbit/s) using optical fiber. OC-1 is the basic rate for the SONET optical fiber lines and the other rate levels of SONET are multipled based on the OC-1 speed. OC-1 is equivalent to STS-1 (Electrical level) and STM-0 (SDH).