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CXR Larus 80-100-400 Issue 2 July 2006 page
3-31
3.3621 Accuracy (20 years):
a. 1.544 MHz ±5 x 10
-11
(±1.544 x 10
-5
Hz)
in GPS mode (Stratum 1/PRC)
b. 1.544 MHz ±4.6 x 10
-7
if tracking DS1 inputs (Stratum 3E)
c. 2.048 MHz ±4.7 x 10
-7
(±0.94 Hz)
if tracking E1 inputs (LNC)
3.3622 Pull-in
Range:
a. 1.544 MHz ±1 x 10
-11
(±1.544 x 10
-5
Hz)
in GPS mode (Stratum 1/PRC)
b. 1.544 MHz ±4.6 x 10
-6
(±7.1 Hz)
if tracking DS1 inputs (Stratum 3E)
c. 2.048 MHz ±4.6 x 10
-6
(±9.42 Hz)
if tracking E1 inputs (LNC)
3.3623 Holdover
Drift:
±1 x 10
-8
per day over any ±5
°
C temperature range
3.3624 Traceability:
<1 x 10
-11
3.3625 Warmup
Time:
If the 54591 has been unplugged for more than 20 minutes, it can take up to 5
hours before the GPS receiver has achieved Stratum 1/PRC accuracy. If the
54591 has been unplugged for less than 20 minutes, it can take up to 2 hours
before the GPS receiver has achieved Stratum 1/PRC accuracy in the Known
mode. During this time, the 54591 will be tracking an input signal with Stratum
3E/LNC accuracy if an input signal is present.
NOTE:
The output driver cards (Models 54571 through 54577) will not deliver an output whose
frequency is within specification until the 54591 card has completed its warmup cycle
following plug-in or power turn-on.
