* "GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI Express and PXI NIPXI-6683H, NIPXI6683," National Instruments.
Time-Based Synchronization Accuracy Tests Results for NI PXI-6683 Test Results IEEE 1588 3m Ethernet [+ or -] 25 ns, <4 ns standard Direct Cable deviation IEEE 1588 through a 1588 [+ or -] 40 ns, <8 ns standard switch deviation GPS/PPS [+ or -] 40 ns, <8 ns standard deviation IRIG-B DC [+ or -] 55 ns, <13 ns standard deviation IEEE 1588 through a hub [+ or -] 60 ns, <35 ns standard deviation IRIG-B AM matching [+ or -] 1.15 ps, <260 ns standard deviation IEEE 1588 through a switch [+ or -] 25 [micro]s, <150 ns standard deviation IEEE 1588v2.1/White Rabbit <1 ns
Modulated IRIG-B is treated more like an audio telephone signal and achieves accuracies in the tens of microseconds.
(2.) Dickerson, B., IRIG-B Time Code Accuracy and Connection Requirements with comments on IED and system design considerations, Arbiter Systems.
- Synchronized IRIG-B
or GPS precision time-stamp on each video frame
Microsecond Accuracy For Synchronizing Ieds, Featuring Dc Irig-b
IEEE 1588 offers an excellent alternative to IRIG-B
, which is used heavily in military test installations.
The interface to be implemented is through the time code formats NTP (network time protocol) and IRIG-B
(inter-range instrumentation group, time code B).
To test the fly-by-wire system, the HIL setup required 600 channels of analog and digital I/O, ARINC-429 for avionics communications, and IRIG-B for overall system synchronization.
Of the many IRIG formats, the most common version is IRIG-B, which uses a 1-kHz frequency to encode the date, hour, minute, and second.
Specifically, the IRIG-B 74-b serial time code contains 30 b of binary coded decimal (BCD) time of year data, 17 b of straight binary seconds of day, 9 b for year information, and 18 b for control data.
Configurations with support for ARINC 717, ARINC 573, and IRIG-B
receiver (AM or DC/TTL) and generator (DC/TTL) support are optional.