/contrib/ntp/scripts/stats/README.timecodes
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- Radio Timecode Formats (README.timecodes)
- Following are examples of the serial timecode formats used by various
- timecode receivers as given in the instruction manuals. These examples
- are intended only for illustration and not as the basis of system
- design. The following symbols are used to identify the timecode
- character that begins a subfield. The values given after this symbol
- represent the character offset from the beginning of the timecode string
- as edited to remove control characters.
- C on-time character (start bit)
- Y year of century
- T time of day
- D day of year or month/day
- A alarm indicator (format specific)
- Q quality indicator (format specific)
- <LF> ASCII line feed (hex 0a)
- <CR> ASCII carriage return (hex 0d)
- <SP> ASCII space (hex 20)
- In order to promote uniform behavior in the various implementations, it
- is useful to have a common interpretation of alarm conditions and signal
- quality. When the alarm indicator it on, the receiver is not operating
- correctly or has never synchronized to the broadcast signal. When the
- alarm indicator is off and the quality indicator is on, the receiver has
- synchronized to the broadcast signal, then lost the signal and is
- coasting on its internal oscillator.
- In the following uppercase letters, punctuation marks and spaces <SP>
- stand for themselves; lowercase letters stand for fields as described.
- Special characters other than <LF>, <CR> and <SP> are preceded by ^.
- Spectracom 8170 and Netclock/2 WWV Synchonized Clock (format 0)
- "<CR><LF>i ddd hh:mm:ss TZ=zz<CR><LF>"
- C A D T
- poll: ?; offsets: Y = none, D = 3, T = 7, A = 0, Q = none
- i = synchronization flag (<SP> = in synch, ? = out synch)
- ddd = day of year
- hh:mm:ss = hours, minutes, seconds
- zz = timezone offset (hours from UTC)
- Note: alarm condition is indicated by other than <SP> at A, which
- occurs during initial synchronization and when received signal has
- been lost for about ten hours
- example: " 216 15:36:43 TZ=0"
- A D T
- Netclock/2 WWV Synchonized Clock (format 2)
- "<CR><LF>iqyy ddd hh:mm:ss.fff ld"
- C AQY D T
- poll: ?; offsets: Y = 2, D = 5, T = 9, A = 0, Q = 1
- i = synchronization flag (<SP> = in synch, ? = out synch)
- q = quality indicator (<SP> < 1ms, A < 10 ms, B < 100 ms, C < 500
- ms, D > 500 ms)
- yy = year (as broadcast)
- ddd = day of year
- hh:mm:ss.fff = hours, minutes, seconds, milliseconds of day
- l = leap-second warning (L indicates leap at end of month)
- d = standard/daylight time indicator (<SP> standard, D daylight)
- Note: alarm condition is indicated by other than <SP> at A, which
- occurs during initial synchronization and when received signal has
- been lost for about ten hours; unlock condition is indicated by
- other than <SP> at Q, with time since last lock indicated by the
- letter code A < 13 min, B < 1.5 hr, C < 7 hr, D > 7 hr.
- example: " 92 216 15:36:43.640 D"
- AQ D T
- TrueTime 468-DC Satellite Synchronized Clock (and other TrueTime
- receivers)
- "<CR><LF><^A>ddd:hh:mm:ssq<CR>"
- D T QC
- poll: none; offsets: Y = none, D = 0, T = 4, A = 12, Q = 12
- hh:mm:ss = hours, minutes, seconds
- q = quality/alarm indicator (<SP> = locked, ? = alarm)
- Note: alarm condition is indicated by ? at A, which occurs during
- initial synchronization and when received signal is lost for an
- extended period; unlock condition is indicated by other than <SP>
- at Q
- example: "216:15:36:43 "
- D T Q
- Heath GC-1000 Most Accurate Clock (WWV/H)
- "<CR>hh:mm:ss.f dd/mm/yy<CR>"
- C T A D
- poll: none; offsets: Y = none, D = 15, T = 0, A = 9, Q = none
- hh:mm:ss = hours, minutes, seconds
- f = deciseconds (? when out of spec)
- dd/mm = day, month
- yy = year of century (from DIPswitches)
- Note: 0?:??:??.? is displayed before synch is first established and
- hh:mm:ss.? once synch is established and then lost again for about
- a day.
- example: "15:36:43.6 04/08/91"
- T A D Y
- PST/Traconex 1020 Time Source (WWV/H) (firmware revision V4.01)
- "frdzycchhSSFTttttuuxx<CR>" "ahh:mm:ss.fffs<CR>" "yy/dd/mm/ddd<CR>"
- A Q T Y D
- poll: "QMQDQT"; offsets: Y = 0, D = 3 T = 1,, A = 11, Q = 13
- f = frequency enable (O = all frequencies enabled)
- r = baud rate (3 = 1200, 6 = 9600)
- d = features indicator (@ = month/day display enabled)
- z = time zone (0 = UTC)
- y = year (5 = 1991)
- cc = WWV propagation delay (52 = 22 ms)
- hh = WWVH propagation delay (81 = 33 ms)
- SS = status (80 or 82 = operating correctly)
- F = current receive frequency (1-5 = 2.5, 5, 10, 15, 20 MHz)
- T = transmitter (C = WWV, H = WWVH)
- tttt = time since last update (minutes)
- uu = flush character (03 = ^C)
- xx = 94 (unknown) (firmware revision X4.01.999 only)
- a = AM/PM indicator (A = AM, P = PM, <SP> - 24-hour format)
- hh:mm:ss.fff = hours, minutes, seconds, milliseconds of day
- s = daylight-saving indicator (<SP> standard, D daylight)
- yy = year of century (from DIPswitches)
- dd/mm/ddd = day of month, month of year, day of year
- Note: The alarm condition is indicated by other than ? at A, which
- occurs during initial synchronization and when received signal is
- lost for an extended period. A receiver unlock condition is
- indicated by other than "0000" in the tttt subfield at Q.
- example: "O3@055281824C00000394 91/08/04/216 15:36:43.640"
- T Y D T
- David L. Mills
- University of Delaware
- mills@udel.edu
- 23 October 1993