Originally Posted by
GordonR_Cape
High order bit correction is mostly used in noisy transmission neworks, such as phones and satellites. If you have interference on the data lines in your brand new aircraft, then there are much more serious things to worry about.
Thats valid only if there is no fault in the harness, connection and in all receiving devices. With a single parity bit for 32 bits it’s as good as no protection at all. What if your data line signal noise level becomes marginal because of one failed receiver or a harness problem? You will process false data which are still valid and look as good data. In automotive CAN for example there is a more robust CRC protection and the same as your above argument for the system can be made. Troubleshooting of intermittent problems is much easier if you can get a fault statistic in the devices and you have a robust method to detect communication errors.