Spectracom Corporation
Model 9289
NetClock/NTP Network Time Provider Instruction Manual
5-7
5.5
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:
FFFFIMJDXX^HHMMSS.SSSS^L CR LF
where:
FFFF =
Format Identifier (0004)
I =
Time Sync Status (Space, ? *)
MJDXX =
Modified Julian Date
HH =
Hours (00-23 UTC time)
MM =
Minutes (00-59)
SS.SSSS =
Seconds (00.0000-60.0000)
L =
Leap Second Indicator (^, 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:
(Space) =
Whenever the front panel time synchronization lamp is green.
? =
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 at the end of the month.
L =
when a leap second correction is scheduled at the months end.
Example:
0004 50085 124536.1942 L
The example data stream provides the following information:
Data format:
4
Sync Status:
Time synchronized to GPS.
Modified Julian Date: 50085
Time:
12:45:36.1942
UTC
Leap Second:
A leap second is scheduled at the end of the month.
Summary of Contents for 9289
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