Amendment Standard - Superseded. The Ministry of Industry and Information Technology (MIIT) of the People's Republic of China has approved the 174--216 MHz, 407--425 MHz, and 608--630 MHz bands for medical information transmission. China medical band (CMB) devices operating within these bands conform to a set of rules specified in MIIT Doc 423-2005, which restricts use of the band to only medical, non-voice use under direction of a healthcare practitioner, among other requirements. A physical layer (PHY) for devices operating on Chinese approved bands for medical signals is defined in this amendment.