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E154713
5-13
5: Communication Wiring
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
5.11: Time Synchronization Alternatives
(See the
Communicator EXT
TM
4.0 and MeterManager EXT Software User Manual
for
details.)
IRIG-B (see Section 5.10 for more details)
• IRIG-B, or inter-range instrumentation group, time codes are clock signals received
from a precision timing GPS receiver.
• All Nexus® 1500+ meters are equipped to use IRIG-B for time synchronization.
• If IRIG-B is connected, this form of time synchronization takes precedence over the
internal clock. If the GPS Signal is lost, the internal clock takes over time keeping
at the precise moment the signal is lost.
IEEE 1588 PTP
• The time synchronization provided by optional IEEE 1588 PTP architecture lets you
synchronize time for a network without needing GPS receiver for each node. The
IEEE 1588 standard uses a “Best Master Clock” algorithm, which identifies the clock
with the most accurate time and then synchronizes all the other devices on the
network with it, to maintain accurate time throughout the network of devices. this
time synchronization method achieves accuracy within the sub-microsecond range.
Line Frequency Clock Synchronization
• Line Frequency Sync (synchronization) allows the meter to use the AC line
frequency as a time base to keep its internal clock accurate. It should be used as
the default when better time synchronization is not available.
• All Nexus® meters are equipped with Line Frequency Clock Synchronization, which
may be enabled or disabled for use instead of IRIG-B. If Line Frequency Clock
Synchronization is enabled and power is lost, the internal clock takes over at the
precise moment power is lost.
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