T e m p u s L X G P S U s e r M a n u a l
92
A P P E N D I X H
93
T e m p u s L X G P S U s e r M a n u a l
S P E C I F I C A T I O N S
Optional Outputs:
See
Chapter 2 - Physical Description
for more information on these outputs.
1 PPS:
Positive TTL pulse @ 50
Ω
.
Width:
User selectable to 20 us, 1 ms, 100 ms, 500 ms.
Accuracy:
< 30 nanoseconds to GPS Time when locked.*
Stability:
TDEV < 20 ns,
τ < 10
5
seconds.
Connector:
Rear-panel BNC jack.
* <100 nanoseconds to UTC. Constraints in the official GPS specification prohibit claiming an
accuracy to UTC better than 100 nanoseconds.
AM Code:
1 Vrms @ 50
Ω
, 1 KHz carrier.
Signal:
Amplitude-modulated (AM), 3:1 ratio.
Format:
User selectable to IRIG-B (120/IEEE-1344, 122, 123), NASA-36, 2137.
Connector:
Rear-panel BNC jack.
Prog TTL Pulse Rate:
Positive TTL pulse @ 50
Ω
on BNC jack.
Rate:
User selectable to 1, 10, 100, 1K, 10K, 100K, 1M, 5M, 10M PPS and Timecode.
Accuracy:
< 10
-13
to UTC for 24-hour averaging times when locked.
Stability:
σ
y
(
τ
) < 10
-9
for
τ
< 10
2
seconds,
σ
y(
τ
) < 10
-7
/
τ
for
τ
> 10
2
seconds.
Connector:
Rear-panel BNC jack.
Alarm:
MMBT2222A open collector, grounded emitter. High impedance in alarm state.
Voltage:
40 VDC, maximum.
Saturation Current:
100 mA, maximum.
Connector:
Rear-panel BNC jack or terminal strip.
Serial Time:
Output only port at RS-232 levels.
Baud Rate:
User Selectable to 4800, 9600, 19200 or 57600.
Parity:
User Selectable to Odd, Even or None.
ASCII Formats:
User-Selectable to Sysplex, EndRun, EndRunX, Truetime, or NENA.
Connector:
Rear-panel DB-9M connector.
Pinout:
Pin 3 is Transmit Data. Pin 5 is GND.
(See
Appendix F - Serial Time Output
for more information.)
1 PPS (RS-422):
RS-422 Levels
Width:
User selectable to 20 us, 1 ms, 100 ms, 500 ms.
Accuracy:
< 30 nanoseconds to GPS Time when locked.*
Stability:
TDEV < 20 ns,
τ < 10
5
seconds.
Connector:
Rear-panel DB-9M jack.
Pinout:
Pin 3 is +signal. Pin 6 is -signal. Pin 5 is GND.
* <100 nanoseconds to UTC. Constraints in the official GPS specification prohibit claiming an
accuracy to UTC better than 100 nanoseconds.
Fixed Rate:
Positive TTL pulse @ 50
Ω
.
Rate:
Preset at Factory and cannot be changed.
Accuracy:
< 10
-13
to UTC for 24-hour averaging times when locked.
Stability:
σ
y
(
τ
) < 10
-9
for
τ
< 10
2
seconds,
σ
y(
τ
) < 10
-7
/
τ
for
τ
> 10
2
seconds.
Connector:
Rear-panel BNC jack.
Summary of Contents for Tempus LX GPS
Page 1: ...Smarter Timing Solutions Tempus LX GPS Network Time Server User Manual...
Page 2: ......
Page 6: ...Te m p u s L X G P S U s e r M a n u a l...
Page 36: ...Te m p u s L X G P S U s e r M a n u a l 24 C H A P T E R T H R E E...
Page 84: ...Te m p u s L X G P S U s e r M a n u a l 72 A P P E N D I X C...
Page 90: ...Te m p u s L X G P S U s e r M a n u a l 78 A P P E N D I X E...
Page 107: ...95 Te m p u s L X G P S U s e r M a n u a l S P E C I F I C AT I O N S...
Page 108: ...Te m p u s L X G P S U s e r M a n u a l 96 A P P E N D I X H...
Page 112: ...Te m p u s L X G P S U s e r M a n u a l 100 A P P E N D I X I...
Page 114: ...Te m p u s L X G P S U s e r M a n u a l 102 S P E C I A L M O D I F I C AT I O N S...
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