Leap Second Month:
00=None scheduled
03=March
06=June
09=September
0C=December
Leap Second Zone:
0=Out of zone
1=Within zone
Zone is 15 minutes before to 15 minutes after a leap second.
GPS Week:
Up to FFFF
GPS Second:
Second of week 000000 up to 093A7F (604799 decimal)
GPS to UTC offset:
2’s complement binary signed integer, seconds
Checksum:
Sum of all bytes up to and including the checksum (sum includes the AAAA start identifier
but excludes the 9999 end identifier)
5.4.14.3 Format BBC-03 PSTN
The third format is a string ASCII characters and is sent on a received character.
The message should be advanced by an appropriate number such that the stop bit of each
<CR> occurs at the start of the next second. For example, at 300 baud, 8 data bits, 1 stop bit,
and no parity, each byte takes 10/300s=33ms, so the <CR> byte should be advanced by
33ms in order for the <CR>’s stop bit to line up with the start of the next second.
Time information is available in UTC format or UK TOD format.
SecureSync User Reference Guide 537
APPENDIX
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