Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
5-8
5.6
Format 7
This format provides a time data stream with millisecond resolution. The Format 7 data stream
consists of indicators for time synchronization status, leap second and Daylight Saving Time.
Time data reflects UTC time and is in the 24-hour format. Format 7 data structure is shown
below:
NOTE:
Format 7 cannot be configured for a Time Zone Offset or with automatic Daylight
Saving Time adjustment. Attempting to configure a Local clock using Data Format 7
with either a Time Zone Offset or automatic DST rule will result in an error message.
CR LF I^YY^DDD^HH:MM:SS.SSSL^D CR LF
where:
CR = Carriage Return
LF = Line Feed
I = Time Sync Status (space, ?, *)
YY = Year without century (99, 00, 01 etc.)
^ = space separator
DDD = Day of Year (001 - 366)
HH = Hours (00-23 UTC time)
: = Colon separator
MM = Minutes (00-59)
SS = Seconds (00-60)
. = Decimal Separator
SSS = Milliseconds (000-999)
L = Leap Second Indicator (space, L)
D = Daylight Saving Time Indicator (S,I,D,O)
The leading edge of the first character (CR) marks the on-time point of the data stream.
The time synchronization status character I is defined as described below:
(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 for the end of the month.
L =
When a leap second correction is scheduled for the end of the month.
The Daylight Saving Time indicator D is defined as:
S = During periods of Standard time for the selected DST schedule.
I =
During the 24-hour period preceding the change into DST.
D =
During periods of Daylight Saving Time for the selected DST schedule.
O =
During the 24-hour period preceding the change out of DST.
Summary of Contents for 9289
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