3.2.5.2 LocalClockDispersion Processing
If the ADM element sys.refid is set to "LOCL", then the server MUST set the Root Dispersion (sys.rootdispersion) ADM element to the value of the LocalClockDispersion element. The sys.refid and sys.rootdispersion ADM elements are defined in [RFC1305] section 3.2.1, "Common Variables".