Orolia Seven Solutions WR-ZEN Series, User Manual

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Note: FOCA is based on BMCA, thus it is compatible with all the clock qual-
ity and timing information fields. In other words, this means that a device
running FOCA strategy can provide timing to a BMCA device and BMCA
information is provided to FOCA algorithm.
5.1.3 Virtual Clock Overview
The concept of “Virtual Clock” has been introduced in the new version of WRZ-OS to aid
monitoring of the global timing status of the device. It allows to abstract the way the timing
sources discipline the local oscillator and summarizes how the device will announce its own
clock information through the outputs.
Figure 5-3:
Data-flow between timing sources, virtual clock and outputs
When using the FOCA policy (see "Data-flow between timing sources, virtual clock and
outputs" above ), the virtual clock will be fed by the active timing source (e.g., tsrc
1
), then
this information (clock quality & time properties) will be forwarded by all the outputs:
directly in case of PTP/WR protocol.
by properly modifying the corresponding fields in the case of NTP, NMEA, etc.
The following figure displays the overview panel of the virtual clock information when the
device is using an external reference from front-panel (GM) as the active source where:
5.1 Multi-sources & Resiliency
CHAPTER
5
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