204 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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1
TIME QUALITY INDICATORS
The XLi provides an estimate of the worst-case error based on the user-entered Time Quality Flags.
This is indicated by each of the four time quality lines changing to the high state in turn as the worst-case
error exceeds the threshold for that line. The time error may be determined from the table below. The
first column shows the pin number of the rear panel 50-pin connector. The second column shows the
time error threshold at the transition from low to high on that pin.
TIME QUALITY INDICATORS
PIN ESTIMATED WORST-CASE
#
(50) GOES HIGH First Threshold
(14) GOES HIGH Second Threshold
(15) GOES HIGH Third Threshold
(17) GOES HIGH Fourth Threshold
9 80's of usec 22 GND
10 100's of usec 23 GND
11 200's of usec 24 1MPPS STROBE
12 400's of usec 25 800's of usec
13 NOT USED
Table 8:
PIN # State Threshold
50 Goes High First
14 Goes High Second
15 Goes High Third
17 Goes High Fourth
Table 7:
PIN # OUTPUT PIN # OUTPUT
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