Spectracom NetClock 9400 Series, User Reference Manual

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SS (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:
? 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 quality indicator (
Q
) provides an inaccuracy estimate of the output data stream. When the
receiver is unable to track any GNSS satellites, a timer is started. "Quality indicators" below
lists the quality indicators and the corresponding error estimates based upon the GNSS
receiver 1PPS stability, and the time elapsed tracking no satellites. The Tracking Zero Satellites
timer and the quality indicator reset when the receiver reacquires a satellite.
Quality Time (hours) TXCO Error (milliseconds)
OCXO Error
(milliseconds) Rubidium Error
(microseconds)
Space Lock <1 <0.01 <0.3
A <10 <10 <0.72 <1.8
B <100 <100 <7.2 <18
C <500 <500 <36 <90
D >500 >500 >36 >90
Table 5-12:
Quality indicators
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.
NetClock User Reference Guide 395
APPENDIX