def get_port_from_usb( first_usb_index, second_usb_index ):
    """
    Based on last two USB location index, provide the port number
    """
    acroname_port_usb_map = {(4, 4): 0,
                             (4, 3): 1,
                             (4, 2): 2,
                             (4, 1): 3,
                             (3, 4): 4,
                             (3, 3): 5,
                             (3, 2): 6,
                             (3, 1): 7,
                             }
    return acroname_port_usb_map[(first_usb_index, second_usb_index)]