Definitions for "Stratum"
Keywords:  strata, sedimentary, plural, layer, bed
A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
A bed or layer artificially made; a course.
A horizontal layer of geologic material of similar composition, especially one of several parallel layers arranged one on top of another.
Keywords:  xntpd, clock, utc, daemon', hops
level of clock source used to categorize accuracy
The distance a host running the xntpd time daemon is from an external source of Coordinated Universal Time (UTC). A stratum 1 server has direct access to an external source of UTC, such as a radio clock synchronized to a standard time signal broadcast. In general, a stratum server is n-1 network hops away from a stratum 1 server. For example, a stratum 4 server is 3 hops away from a stratum 1 server. Also, a stratum server is at a higher stratum than a stratum n-1 server. For example, a stratum 3 server is at a higher stratum than a stratum 2 server, and at a lower stratum than a stratum 4 server. See also ``time daemon''.
The stratum value is calculated from the number of computers in the NTP hierarchy to the time refere ...
a subset of the population that share at least one common characteristic