Symmetricom XLi IEEE 1588 System Time & Frequency Accuracy, Chassis, GPS Receiver, Aux Ref Input

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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

1 PPS Output:

Frequency Output Accuracy:

Frequency/Timing, Allan Deviation, Stability:

AM Code Output Accuracy:

DC Level Shift Code Output Accuracy:

Time to System Lock

±30 ns RMS, 100 ns peak without SA (99%)

< 2x 10-12

1x 10-9@ 1 sec

2x 10-10@ 1000 sec 1x 10-12@ 1 day

10μS to the 1 PPS

200ns to the 1 PPS

<20 min. typical

See GPS Signal Strength Requirements (page 17) and 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 “F3 – Time & Date” on page 40.

Chassis

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

10 XLi IEEE 1588 Clock

997-01510-03, Rev. C, 12/12/2006