Parallel Bcd Usec With Time Quality (87-8090-1) - Symmetricom XLi User Manual

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TIME QUALITY INDICATORS
Table 5:
PIN # State
50 Goes High
14 Goes High
15 Goes High
17 Goes High
PIN # ESTIMATED WORST-CASE
(50) GOES HIGH
(14) GOES HIGH
(15) GOES HIGH
(17) GOES HIGH
ERROR ALL PINS LOW (Less than First Threshold)
When time is again synchronized, the time quality lines will again go low as the unit re-corrects to the
proper time. At initial turn-on or after a power failure, the time quality lines will remain in the high state
until the clock has synchronized. The time quality lines can, therefore, be used as read-inhibit lines to
guarantee a given timing accuracy.
1 PPS, 1 kPPS STROBE LINES
Both 1 PPS and 1 kPPS strobe lines on the 50-pin output connector indicate valid BCD time data.
The 1 PPS 50% duty cycle output line on Pin (16)[6] of the 50-pin connector switches to the high
state 100ns after the second. This allows the user to use the rising edge of this strobe to clock data into
a remote system. The 100 ns delay allows for the output register time delay plus the user's interface
setup-time requirements. At any time the 1 PPS strobe line is high, the data lines from seconds up will
not be changing states and are therefore available for reading.
The 1 kPPS 50% duty cycle output line on pin (9)[20] of the 50-pin connector switches to the high state
100 ns after the millisecond. The 100 ns delay allows for the output register time delay plus the user's
interface set up time requirements. At any time the 1 kPPS line is high, the data lines from milliseconds
up will not be changing states and are therefore available for reading.

Parallel BCD uSec with Time Quality (87-8090-1)

This Parallel BCD module provides a microsecond parallel time output. The BCD time data consists of
54 lines representing 100's of days to units of microseconds, four time quality lines that provide an
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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Threshold
First
Second
Third
Fourth
First Threshold
Second Threshold
Third Threshold
Fourth Threshold
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2
1
5
S S S S
201