Line Echo Canceller
The Line EC (LEC) is designed to operate inside a device that has a local hybrid circuit. The hybrid circuit is the circuit that converts between a4-wire and a 2-wire interface. Hybrid circuits include:SLIC (Subscriber Line Interface Circuit)FXO (Foreign Exchange – Office)FXS (Foreign Exchange – Subscriber)DAA (Data Access Arrangment)Examples of equipment that need a line echo canceller include:
- VoIP Gateway with FXO and/or FXS interfaces
The significance of the local hybrid is that there is little delay between the hybrid, the source of the echo, and the echo canceller.