This object reports whether the device's G.781-based automatic clock selection process is enabled at all, a simple true/false gate on the entire feature. It matters because if this reports false, none of the other G.781-related objects in this MIB, such as holdoff times, quality levels, or revertive mode, are actually influencing which clock source the device uses; the feature is just off. An admin puzzled about why changing a clock-source priority setting had no effect should check this value first, since a false here explains the whole mechanism is dormant.