diff options
Diffstat (limited to 'scripts/stats/README.timecodes')
| -rw-r--r-- | scripts/stats/README.timecodes | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/scripts/stats/README.timecodes b/scripts/stats/README.timecodes new file mode 100644 index 0000000..00b5ba5 --- /dev/null +++ b/scripts/stats/README.timecodes @@ -0,0 +1,149 @@ +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 |