Forward error correction (FEC) provides two advantages, the ability to recover lost packets from extra redundant information sent with original data, and the ability to recover any lost packet with each extra parity packet. The cost is extra processing time calculating the redundant parity packets and regenerating lost packets.
The PGM protocol transport can elect to offer either or both forms of error correction together with regulation selective re-transmission requests.
Other News:
The MIT DARPA Urban Challenge Team published their Lightweight Communications and Marshalling (LCM) library. Similar to Rendezvous 8 it provides an in-process daemon but with basic subject naming, XDR message format, and optional reliability. APIs for C, Java, and Python.
--Steve-o 2008-03-18
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