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Spectracom Format 4
Format 4 provides a format indicator, time synchronization status character, modified Julian date, time reflecting UTC with 0.1 millisecond resolution and a leap second indicator. Format 4 data structure is shown below:
Example:
FFFFIMJDXX^HHMMSS.SSSS^L CR LF
Where:
FFFF | Format Identifier (0004) |
I | Time Sync Status (Space, ?, *) |
MJDXX | Modified Julian Date |
^ | Space separator |
HH | Hours (00-23 UTC time) |
MM | Minutes (00-59) |
SS.SSSS | Seconds (00.0000-60.0000) |
L | Leap Second Indicator (space, L) |
CR | Carriage Return |
LF | Line Feed |
The start bit of the first character marks the on-time point of the data stream.
The time synchronization status character (I
) is defined as described below:
? | When the receiver is unable to track any satellites and the time synchronization lamp is red. |
* | When the receiver time is derived from the battery backed clock or set manually through the Setup Port Interface. |
The leap second indicator (L
) is defined as:
(Space) | When a leap second correction is not scheduled for the end of the month. |
L | When a leap second correction is scheduled for the end of the month. |
Example:
0004 50085 124536.1942 L
The example data stream provides the following information:
Data format | 4 |
Sync Status | Time synchronized to GNSS. |
Modified Julian Date | 50085 |
Time | 12:45:36.1942 UTC |
Leap Second | A leap second is scheduled at the end of the month. |