FEC
Context
Forward error correction (FEC) is mainly used for improving transmission quality of a line.No ideal digital channel is available in practice. As a result, bit errors and jitter occur when digital signals are being transmitted over any transmission medium, deteriorating transmission quality on lines.
To resolve the problem, error correction mechanism is introduced.
- The mechanism can check and correct errors after data is transmitted to the peer end. such as FEC.
- The mechanism can check errors after data is transmitted to the peer end but not correct errors.
Highlight and Application
- Does not require retransmission and provides a high real-time performance
- Requires an additional bandwidth (Users must balance the transmission quality and bandwidth.)
- Checks and corrects errors after data is transmitted to the peer end, but does not apply to services for which retransmission is enabled
- Applies to data transmission on the network that has a poor quality
- Applies to services that have a low requirement on delay (The delay is large if retransmission is configured for services.)
Configuration Guide
The FEC function of 10G GPON as follows:
- Supported only in the downstream direction.
- FEC is enabled by default.
- The FEC function cannot be configured manually.
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