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ntp 4.2.6p5

    1: This is a short overview for the reference clocks currently supported
    2: by xntp V3. (Ultimate wisdom can be obtained from xntpd/refclock_*.c
    3: this file was derived from that information - unfortunately some comments
    4: in the files tend to get stale - so use with caution)
    5: 
    6: Refclock address	Type
    7: 127.127.0.x		no clock (fails to configure)
    8: 127.127.1.x		local clock - use local clock as reference
    9: 127.127.2.x		no clock (fails to configure)
   10: 127.127.3.x		PSTI 1010/1020 WWV Clock
   11: 127.127.4.x		SPECTRACOM WWVB receiver 8170 and Netclock/2
   12: 127.127.5.x		Kinimetric Truetime 468-DC GOES receiver
   13: 127.127.6.x		IRIG audio decode (Sun & modified BSD audio driver)
   14: 127.127.7.x		CHU Timecode (via normal receiver & Bell 103 modem)
   15: 127.127.8.x		PARSE (generic driver for a bunch of DCF/GPS clocks
   16: 			       can be extended for other clocks too)
   17: 	8.0-3		Meinberg PZF535/TCXO
   18: 	8.4-7		Meinberg PZF535/OCXO
   19: 	8.8-11		Meinberg DCF U/A 31
   20: 	8.12-15		ELV DCF7000
   21: 	8.16-19		Walter Schmid DCF receiver (Kit)
   22: 	8.20-23		Conrad DCF77 receiver module + level converter (Kit)
   23: 	8.24-27		TimeBrick (limited availability ask
   24: 				   time@informatik.uni-erlangen.de)
   25: 	8.28-31		Meinberg GPS166
   26: 	8.32-35		Trimble SV6 GPS receiver
   27: 127.127.9.x		MX4200 GPS receiver
   28: 127.127.10.x		Austron 2201A GPS Timing Receiver
   29: 127.127.11.x		Kinemetrics Truetime OM-DC OMEGA Receiver
   30: 127.127.12.x		KSI/Odetecs TPRO-S IRIG-B / TPRO-SAT GPS
   31: 127.127.13.x		Leitch: CSD 5300 Master Clock System Driver
   32: 127.127.14.x		MSFEES
   33: 127/127.15.x		TrueTime GPS/TM-TMD
   34: 127.127.16.x		Bancomm GPS/IRIG Ticktock
   35: 127.127.17.x		Datum Programmable Time System