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Low-density parity-check (LDPC) codes are a class of highly efficient linear block codes made from many single parity check (SPC) codes. They can provide performance very close to the channel capacity (the theoretical maximum) using an iterated soft-decision decoding approach, at linear time complexity in terms of their block length.
May 1, 2020 · The FEC and CRC errors can appear at any time; there seems to be no real pattern. To give you an example, just since they left yesterday afternoon (it's been about 24 hours), I have had 5,205,160 FEC errors and 1,063,952 CRC errors. They continue to flood in as I am writing this. In the last 15 minutes, I have had 396,474 CRC errors alone.
- I get tons of FEC and CRC errors almost daily. If you are seeing these errors in the modem logs then it is definitely an issue with the line from...
- My grandfather had this exact situation with his DSL years ago. It took a dozen visits (from myself and other local computer experts and multiple p...
- July 17, 2020. I wanted to give everyone an update. The last I mentioned was that a team leader from the phone company (which provides my DSL serv...
- You need a tech with a TDR (Time Domain Reflectometer) like this. No you dont need to pay for this. Try unplugging the line filters on your phone...
- I would lock down the IP addresses in your house. Check that only one device on your network (your main router) is giving out IP addresses (i.e. DH...
- FEC are corrected errors. If CRC and ES are both near 0 or actually 0, then it means the connection is stable. A high FEC (as well as high CRC) in...
The receiver is then able to detect certain errors that came from sending data. In certain cases, the receiver can correct the error, without the need for a retransmission. How it works. FEC adds redundancy to the transmitted information with a known algorithm. Each redundant bit is a function of many original information bits.
AMTOR (amateur teleprinting over radio) is a digital communications method used by radio amateurs, in which the frequency of errors is reduced by handshaking or ...
For high-speed transmission based on 16-QAM, multiple high-performance FEC codes have been studied. Table 8.1 shows some of the FEC codes and their performances. The first code is the concentrated FEC (CFEC) code adopted by the Optical Internetworking Forum (OIF) for 400ZR [95,96].
In modern communication systems, information is digitised, coded to logic levels “1” and “0” and often further encoded into complex modulation schemes such as Pulse Amplitude Modulation (PAM) or Quadrature Amplitude Modulation (QAM).
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FEC defined by very sparse parity check matrices. LDPC is a powerful FEC option that is defined by very sparse parity check matrices. LDPC designs allow for parallel iterative decoder processing, which can be implemented in a hardware-friendly fashion while maintaining excellent performance close to the Shannon limit.
