public String getPowerSwitchingMode ()
    {
	switch (getHubCharacteristics () & 0x0003) {
	    case 0x00:	return "ganged";
	    case 0x01:	return "switched";
	    case 0x02:	return "reserved-2";
	    case 0x03:	return "reserved-3";
	}
	return "?";
    }