OC-3/STM-1 at 155.52 Mbps is the base SONET/SDH rate carried over single-mode fiber with LC connectors. Used in legacy carrier SONET rings and SDH multiplexers for aggregating DS1/E1 circuits.
| Pin | Name | Function | Type |
|---|---|---|---|
| TX | TX | OC-3 optical transmit | BUS |
| RX | RX | OC-3 optical receive | BUS |