TX4_C_MARK
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,
RX4_C_MARK, TX4_C_MARK,