    Protocol selections:

    [X]modem:       Sends  files  in  blocks  of  128 characters at a time.
                    When the receiving computer is satisfied that one block
                    has  arrived intact,  it signals  so and  waits for the
                    next  block. Error  checking is  a Checksum  or a  more
                    sophisticated Cyclic Redundancy Check.

    [1]k-Xmodem:    This is a small  variation of Xmodem that  uses  blocks
                    that are 1024 bytes in size.

    [G]-1k-Xmodem:  This  is a  variation of  1k-Xmodem that  is meant  for
                    error free channels such as error  correcting modems or
                    null modem cable links  between two computers. It sends
                    blocks   one   after   another   without   waiting  for
                    acknowledgment from the receiver.

    [Y]modem:       This  protocol  is  a variation  of Xmodem  which keeps
                    the  correct name,  size, and  date of  the files being
                    sent. It may use 128 or 1024 byte blocks.

    Ymod[E]-G:      This protocol is a  variation of Ymodem, which requires
                    an error  free channel such as  error correcting modems
                    or null modem cables. It  sends one block after another
                    without waiting for acknowledgment from the receiver.

    [S]ealink:      This is an  advanced version of Xmodem that is 15 to 25
                    percent  faster than regular Xmodem.  Sealink passes  a
                    file's name, size, and date when transferring.

    [Z]modem:       This advanced protocol is very  fast and  reliable, and
                    offers many features. It keeps the exact file sizes and
                    dates,  and can  resume  an  interrupted transfer  at a
                    later time.  The latter is known  as Crash Recovery. It
                    is  recommended  that  Zmodem  is  used  for  all  data
                    transmissions as  it is the  fastest and  most reliable
                    protocol offered by Telix.
