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A-10 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
A.8 Low-Latency Timing Packets
The Ace UTC and Acutime 2000 feature a sequence of high-priority
timing super packets, which are output within a bounded period of
time after the PPS. The LLT packets offer an advanced data interface
for applications requiring accurate data reports in a time constrained
environment.
On Acutime 2000 and Ace UTC, the first super packet will start
transmission no later than 15 – 25 ms after the PPS transition.
The super packets which meet the LLTP criteria are in the table
below. The packets are listed in order of output priority. Output of
each packet can be turned on/off by using the mask in packet 8E-A5,
but the output order cannot be changed.
The packets may also be requested, please refer to the specific packet
documentation for details.
The receiver will output all other TSIP packets after the transmission
of LLTP packet sequence is complete.
!
Note – Only the first packet will meet the LLTP specification. All other
LLTP packets will be output immediately after the first LLTP packet
completes.
Table A-10 Low-Latency Timing Packets
LLTP Packet ID Description Request Packet ID
8F-AB Primary Timing 8E-AB
8F-AC Supplemental Timing 8E-AC
8F-AD Primary UTC Time 8E-AD
8F-0B Comprehensive Time and Position 8E-0B