A string that combines bitrate and technology type, e.g. '106A'.

def brty(self):
        """A string that combines bitrate and technology type, e.g. '106A'."""
        return ("{0}".format(self._brty_send)
                if self._brty_send == self._brty_recv else
                "{0}/{1}".format(self._brty_send, self._brty_recv))