System time & frequency accuracy, Gps receiver, Aux ref input – Symmetricom XLi IEEE 1588 User Manual
Page 18: Chassis, Gps receiver aux ref input, The gps c/a, Accuracies, see, System time, 1 sec 2 x 10
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XLi IEEE 1588 Clock
997-01510-03, Rev. C, 12/12/2006
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System Time & Frequency Accuracy
The tables below describe system clock accuracy while locked to the reference source indicated.
Currently, GPS is the only supported reference source.
GPS Receiver
See
GPS Signal Strength Requirements (page 17)
GPS C/A Receiver (87-8028-2) (page 4)
.
Aux Ref Input
If an Aux Ref input is available and enabled, the XLi assumes that Aux Ref is a better frequency source
than its own oscillator. If a timing reference is not available (or becomes unavailable) and Aux Ref is
enabled, the XLi locks to the Aux Ref input. Under those conditions, frequency output accuracy is equal
to the reference < 1 x 10
-12
.
Note:
To set the time and date manually, see
.
Chassis
1 PPS Output:
±30 ns RMS, 100 ns peak without SA (99%)
Frequency Output Accuracy:
< 2x 10
-12
Frequency/Timing, Allan
Deviation, Stability:
1 x 10
-9
@ 1 sec
2 x 10
-10
@ 1000 sec
1x 10
-12
@ 1 day
AM Code Output Accuracy:
10
μS to the 1 PPS
DC Level Shift Code Output
Accuracy:
200 ns to the 1 PPS
Time to System Lock
<20 min. typical
1U Chassis:
Standard 19" EIA Rack System, hardware included
Receiver Size:
1.75 in. x 17.1 in. x 15.35 in.
Weight:
Standard configuration, without options ~9.25 lb. Fully loaded ~ 10.95 lb