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Detail
Registered METHOD OF CONTROLLING FEC IN EPON
- Inventors
- Lee Hoon, Yoo Tae Whan, Lee Hyeong Ho
- Application No.
- 11005115 (2004.12.04)
- Publication No.
- 20050149822 (2005.07.07)
- Registration No.
- 7600171 (2009.10.06)
- Country
- UNITED STATES
- Project Code
- 03MT1100, 초고속 광가입자망 기술개발, Yang Jae Woo
- 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.
- KSP Keywords
- Effective operation, Error Correction, Forward error correction(FEC), Link quality, Round trip time, Trip time, optical link