Method of controlling FEC in EPON

Details Method of controlling FEC in EPON Method of controlling FEC in EPON

2004-12-04

2009-10-06

Nguyen, Hanh (Department: 2416)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S048000, C370S216000, C370S470000

Reexamination Certificate

active

07600171

ABSTRACT:
A method of controlling a Forward Error Correction (FEC) operation including: configuring a FEC frame to be transmitted between an OLT and an ONU comprising a FEC frame identifier indicating whether FEC should be performed, data, a first flag indicating that FEC should be performed, and a second flag indicating that the FEC frame is to be FEC encoded; initializing the OLT by disabling a FEC function; determining whether the ONU requires FEC to be performed based on a FEC frame identifier received from the ONU; IPG stretching the FEC frame when the ONU requires to FEC to be performed; and transmitting the FEC frame to the ONU after FEC encoding based on the second flag of an input frame to a PCS sublayer from an upper layer. The method controls an effective operation of a FEC of an ONU and an OLT without changing a Round Trip Time (RTT) according to optical link quality in an EPON. Accordingly, FEC is used only if necessary, thereby simplifying the managing of a link, and preventing an excessive 35% reduction of throughput caused by use of unnecessary FEC.

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