How do the radios handle retransmission of packets with errors?

How do the radios handle retransmission of packets with errors?

AvaLAN products use a sub-block retransmission protocol rather than a full packet retransmission protocol. AvaLAN’s Smart Packet Fragmentation protocol breaks large Ethernet packets into smaller sub-blocks. If any sub-block has an error only that block is retransmitted instead of the whole packet.