This object represents the type of PHY parameter that may have dependencies when setting an individual object in the dependency group. The value 'all' may be used as a wildcard to indicate all PHY parameters have dependencies. The other enumeration values are common QAM PHY parameters. The opposite to 'all' is 'noDependencies', which indicates no dependencies in PHY parameters, but is only used to indicate no dependencies across all the device. Thus, when used, 'noDependencies' is accompanied by docsDrfGroupDependencyPhysicalIndex '0' as the only entry in the table. In this way it is clearly distinguished when a device has dependencies instead of an empty table.