Description: An object defining the FEC mode of operation of the interface, and indicating its state. The modes defined in this object are extensions to the FEC modes defined in the dot3EponFecMode object. When noFECEnabled(1), the interface does not enable FEC mode. When fecTxEnabled(2), the interface enables the FEC transmit mode. When fecRxEnabled(3), the interface enables the FEC receive mode. When fecTxRxEnabled(4), the interface enables the FEC transmit and receive mode. This object is applicable for an OLT and an ONU. At the OLT, it has a distinct value for each virtual interface. The FEC counters are referring to the receive path. The FEC counters will stop when the FEC receive mode of the interface is disabled, as defined by fecRxEnabled(3) and fecTxRxEnabled(4) values. The counters: dot3EponFecPCSCodingViolation - not affected by FEC mode. dot3EponFecCorrectedBlocks - stops counting when Rx_FEC is not enabled (noFecEnabled(1) and fecTxEnabled(2)). dot3EponFecUncorrectableBlocks - stops counting when Rx_FEC is not enabled (noFecEnabled(1) and fecTxEnabled(2)). dot3EponFecBufferHeadCodingViolation - stops counting when Rx_FEC is not enabled (noFecEnabled(1) and fecTxEnabled(2)). The objects: dot3EponFecAbility - indicates the FEC ability and is not affected by the FEC mode. dot3EponFecMode - indicates the FEC mode for combined RX and TX. The write operation is not restricted in this document and can be done at any time. Changing dot3ExtPkgObjectFecEnabled state can lead to disabling the Forward Error Correction on the respective interface, which can lead to a degradation of the optical link, and therefore may lead to an interruption of service for the

users connected to the respective EPON interface.