2: System Specifications
Ratio (AM): 3:1 ± 10%
Amplitude
(DC):
l Logic Low < 0.8V
l Logic Hi > 2.4V
Qty: 1
Connector: BNC female
Phasing
(AM):
In phase with carrier ± 10 mS
Phasing
(DC):
In phase with carrier ± 500 ns
Accuracy: Refer to section 5, Time and Frequency Accuracy
Five flags are encoded in the control function segment of the IRIG B code. The first flag
encoded at element P5+40ms is the LOCK indicator. It is a binary 1 when the reference
source has become unlocked. The second flag encoded at element P5+60ms is a binary 1
when the worst case time error exceeds threshold 1 element P5+70ms is a binary 1 when
the worst case time error exceeds threshold 2. Element P5+80ms encodes a binary 1 when
the error exceeds threshold 3 and P5+90ms when the error exceeds threshold 4.
Time Code Input IRIG-B120 200-04 W/ IEEE1344
The selectable Code input will have an additional selection for IRIG-B-120 w/ IEEE 1344,
configuration is via the Keypad / Display, RS232/422 and the Network port via telnet.
IRIG-B-120 as Defined in IRIG STANDARD 200-04 as:
Format B 100 pps
1 = Sine wave amplitude modulated
2 = 1kHz carrier/1mSec resolution
0 = BCDTOY,CF,SBS
IEEE1344 as defined in IEEE Std C37.118™-2005 ANNEX F as: (see section 3.3 def-
inition)
XL-GPS SYNC:
The XL-GPS shall first synchronize to IRIG-B-120 w/ IEEE1344 when the Time Quality
control bits are = 0000. The XL-GPS shall remain synchronized (Locked) while the Time
Page 14 of 221 .................................098-00116-000 Rev. A
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