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FX.25 Forward Error Correction
FX.25 is a protocol extension to the AX.25 Link Layer Protocol. FX.25 provides a Forward Error Correction (FEC) capability while maintaining legacy compatibility with non-FEC equipment. FX.25 was created by the Stensat Group in 2005, and was presented as a technical paper at the 2006 TAPR Digital Communications Conference in Tucson, AZ.
==Overview==
FX.25 is intended to complement the AX.25 protocol, not replace it. It provides an encapsulation mechanism that does not alter the AX.25 data or functionalities. An error correction capability is introduced at the bottom of Layer 2 in the OSI model.
The AX.25 Link Layer Protocol is extensively used in amateur radio communications. The packets are validated by a 16-bit CRC, and are discarded if one or more errors are detected. In many cases, such as space-to-earth telemetry, the packets are broadcast unidirectionally. No back-channel may available to request retransmission of errored elements. Consequently, AX.25 links are inherently intolerant of errors.
The FX.25 protocol extension provides an error correction "wrapper" around the AX.25 packet, allowing for removal of errors at the receiving end. Data fields have been carefully chosen to allow reception of the AX.25 packet data within an FX.25 frame by a non-FEC decoder.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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