6.8 IRIG-B BOARD
Figure 20: IRIG-B board
The IRIG-B board can be fitted to provide an accurate timing reference for the device. The IRIG-B signal is
connected to the board via a BNC connector. The timing information is used to synchronise the IED's internal
real-time clock to an accuracy of 1 ms. The internal clock is then used for time tagging events, fault
maintenance and disturbance records.
IRIG-B interface is available in modulated or demodulated formats.
Due to slot limitations the IRIG-B facility is also provided in combination with other functionality on a number
of additional boards, such as:
● Fibre board with IRIG-B
● Second rear communications board with IRIG-B
● Ethernet board with IRIG-B
● Redundant Ethernet board with IRIG-B
Each of these boards is also available with either modulated or demodulated IRIG-B.
MiCOM P747 Chapter 3 - Hardware Design
P747-TM-EN-1 49
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