The startup, retrain, renegotiation quick connect or other processes of handshaking
between communication systems involve the exchange of certain modulation, constellation,
precoder, prefilter and other communication related information. The communication
systems exchange one long information sequence including all the necessary communication
information. Subsequently, the communication systems start transmitting short sequences,
including an acknowledgement information portion. If one of the communication systems
does not receive an acknowledgement within a predetermined time or event, that
communication system may retransmit another long information sequence. After such
retransmission, the retransmitting communication system may continue transmitting
the long information sequences or may start transmitting the short sequences once
again. Eventually, each of the communication systems should receive a long information
sequence and acknowledge their receipt of such sequence.
