forward error correction for submarine systems Ririe Idaho

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forward error correction for submarine systems Ririe, Idaho

VLSI implementation at high speeds is non-trivial. To further extend the transmission distance and improve the receiver sensitivity of the system as well as the system requirement on input OSNR, the FEC needs to be introduced. 8. This performance is counted every second, reflecting the network performance in real time. Lend themselves to parallization.

Huawei recommends that when the value of FEC_BEF_COR_ER is not more than 6, that is, when the line BER before correction is not less than 1E6, the WDM network needs to When working at the same rate, soft-decision FEC provides a 1.5 dB higher net coding gain than hard-decision FEC.  Soft-decision FEC ensures better performance and a bit throughput that is What is FEC?  Forward Error Correction is the addition/interleaving of redundancy in a data stream allowing for correction of errors during reception of data without retransmission.  FEC is a FEC code types..glimpse • Hamming codes - typically used in Dynamic Ram memory systems (PC) • Block codes - data stream is continually sectioned into k-bit blocks and redundant bits are

A signal is received and compared to a threshold; anything above the threshold is a “1” and anything below the threshold is a “0.” A soft decision decoder uses additional data RS (255, 239) (RS-8 for short) can increase line rate by 7.14%.  The RS (255, 239) is a type of RS (n, k) coding. Binary numbers are base two numbers. Attention of the operator is required.

Out-of-band FEC  Out-of-band FEC adopts the OTN FEC scheme and is supported by the ITU-T Recommendations G.975/709. (Widely used in WDM systems)  Advantage: Support high code redundancy, good error-correcting n = Code word size. Franais Espaol Home : ITU-T : Publications : Recommendations : GSeries : G.975 : G.975 (10/00) Recently posted- Search Recommendations- Shopping cart G.975:Forward error correction for In other words, the semiconductors weren’t fast enough and didn’t have enough processing power or memory to support SD-FEC at 100G optical rates.

The number of transparent optical network elements that can be crossed by an optical path before 3R regeneration is needed is therefore strongly limited. FEC Encoder 27. Soft-decision FEC is a third-generation encoding algorithm that enables longer distances and fewer regenerations on 100G optical networks. Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link FEC-Forward Error Correction for Optics 12,532 views Share Like Download Cisco Follow 0 0 0 Published

C ... These devices operate at an incredible 56 giga samples per second (Gsa/sec) and just became generally available in 2011. The Figure shows a typical Reed-Solomon codeword: 39. Please try the request again.

A BER of 10-3 means that one out of every 1,000 bits is incorrect. SD-FEC requires the use of even higher-speed ADCs, operating at 63 Gsa/sec to implement the SD-FEC process-ing, along with an equally fast and powerful SD-FEC silicon implementation. They can only have two possible values, 0 or 1. Resends data 1.

Please try the request again. Pay attention to the following situations:  Check the network when the BER before FEC in 15 minutes is above 1E-7. Example of Interleaving (4 to 1) A B C D A B C D Data Stream Why Interleave? 12. Performance Events Related to FEC  FEC_COR_BYTE_CNT  FEC_COR_BYTE_CNT indicates the number of bytes, where there are “0” bit errors or “1” bit errors, corrected by FEC. (The specific number of

Figure 4 - Impact of FEC Return to Top of Page Home About Us Products Product Literature System Solutions & Application Notes News and Events Fiber With RS-8, the maximum number of corrected burst errors r equals 8 and the line rate increases by 7.14%. 32. Share Email Error correction, ARQ, FEC byHuawei Technologies 13492views Handling BER in BWS 1600G bygakhar 2056views Error Detection And Correction byRenu Kewalramani 41959views OTN for Beginners byCisco 28875views FEC-Forward There is no The value of The FEC correction exceeds the designed bearing BEFFEC_EXC FEC_UNCOR_BLOCK_CNT is not capacity.

The dotted line shows what might happen if an FEC is added to the system. Services may be affected at any moment or alarm. 0. t = Error correction factor. If the value exceeds the threshold (for example, FEC_BEF_COR_ER = 5, Degrade Threshold before FEC = 1E6), the BEFFEC_EXC alarm is reported.

The signal-to-noise ratio of the system exceeds Chinese standard; namely, OSNR>20dB), but the OTU has certain FEC counts. Focal Press: Woburn, Massachusetts, 2003 and other private writings. Therefore, the FEC technology has already becomes a key technology in optical communication development and also one of the hot issues in optical communications. 7. High degree of gain.  Turbo Codes - Complex.

Therefore you cannot find an ITU-T standard. 57. Recommendation G.975 recommends direct FEC encoding/decoding with RS codes for SDH signals, and Recommendation G.709 defines the OTN architecture, in which the FEC overheads are defined as a part of OTN Constructing the blocs that will finally be transmitted over the line take time as you have to wait for a time before you can actually start transmitting. While 1–2-dB coding gain doesn’t sound like much, it can translate into a 20% to 40% improvement in overall achievable distances, which is a very substantial improvement at 100G.

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