NTP Reference Clock Identifier. This is a 32 bit code identifying the particular reference clock. In the case of stratum 0 (unspecified) or stratum 1 (primary reference), this is a four- octet, left-justified, zero-padded ASCII string. While not enumerated as part of the NTP spec, the following are suggested ASCII identifiers: ============================================== DCN DCN routing protocol NIST NIST public modem TSP TSP time protocol DTS Digital Time Service ATOM Atomic clock (calibrated) VLF VLF radio (OMEGA,etc.) callsign Generic radio LORC LORAN-C radionavigation GOES GOES UHF environment satellite GPS GPS UHF satellite positioning ============================================== The following ref ids are used by the SyncServer: ============================================== GPS GPS satellite) IRIG IRIG B timecode 1PPS Ext. 1 PPS input E10M Ext. 10 MHz input FREE Internal Clock FLY Internal Clock after the Hardware Clock reference is lost ==============================================