But there are Standards. 2 to be exact: one from OMTP and one from CITA. The OMTP one, is even used as national standard in china: http://www.cspress.com.cn/u/c

But there are Standards. 2 to be exact: one from OMTP and one from CITA. The OMTP one, is even used as national standard in china: http://www.cspress.com.cn/u/cms/www/201208/17092831ounz.pdf http://www.cspress.com.cn/u/cms/www/201208/17092831ounz.pdf